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Review

The Role of Vitamin D in Primary Headache–from Potential Mechanism to Treatment

by
Magdalena Nowaczewska
1,2,*,
Michał Wiciński
3,
Stanisław Osiński
2 and
Henryk Kaźmierczak
2
1
Department of Pathophysiology of Hearing and Balance System, Faculty of Medicine, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University, M. Curie 9, 85-090 Bydgoszcz, Poland
2
Department of Otolaryngology, Head and Neck Surgery, and Laryngological Oncology, Ludwik Rydygier, Collegium Medicum in Bydgoszcz Nicolaus Copernicus University, M. Curie 9, 85-090 Bydgoszcz, Poland
3
Department of Pharmacology and Therapeutics, Faculty of Medicine, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University, M. Curie 9, 85-090 Bydgoszcz, Poland
*
Author to whom correspondence should be addressed.
Nutrients 2020, 12(1), 243; https://doi.org/10.3390/nu12010243
Submission received: 7 November 2019 / Revised: 2 January 2020 / Accepted: 14 January 2020 / Published: 17 January 2020
(This article belongs to the Special Issue Vitamin D in Health and the Prevention and Treatment of Disease)
Browse Figure
Versions Notes

Abstract

:
Some studies have suggested a link between vitamin D and headache; however, the underlying physiological mechanisms are unclear. We aimed to summarize the available evidence on the relationship between vitamin D and the various subtypes of primary headaches, including migraines and tension-type headaches. All articles concerning the association between primary headache and vitamin D published up to October 2019 were retrieved by searching clinical databases, including: EMBASE, MEDLINE, PubMed, Google scholar, and the Cochrane library. All types of studies (i.e., observational, cross-sectional, case-control, and clinical trials) were included. We identified 22 studies investigating serum vitamin D levels in association with headaches. Eight studies also evaluated the effect of vitamin D supplementation on the various headache parameters. Among them, 18 studies showed a link between serum vitamin D levels and headaches, with the strongest connection reported between serum vitamin D levels and migraine. Overall, there is not enough evidence to recommend vitamin D supplementation to all headache patients, but the current literature indicates that it may be beneficial in some patients suffering headaches, mainly migraineurs, to reduce the frequency of headaches, especially in those with vitamin D deficiency.

1. Introduction

Headache is a common symptom with a heterogeneous set of causes. According to the third edition of the International Classification of Headache Disorders (ICHD-3), we distinguish primary headaches (i.e., those without an underlying cause, accounting for 90% of all headaches) and secondary headaches, which are attributable to a specific etiology [1]. Primary headaches are one of the most prevalent neurological disorders, with an age of onset between 20 and 40 years old.
The most prevalent types of primary headaches are migraine and tension-type headaches (TTH). Migraines typically present with pulsating, unilateral, severe headache lasting from 4 to 72 h with accompanying nausea, phonophobia, photophobia, and sometimes, transient neurological symptoms [1,2]. Meanwhile, TTH mostly present with non-pulsating “bandlike” pressure bilaterally of the head, without other symptoms [1,2]. Another, albeit rare, primary headache disorder is the cluster headache (CH), with recurrent attacks lasting from 15 to 180 min up to eight times a day. CHs are characterized by severe unilateral pain, typically around the eye, with associated unilateral tearing, ptosis or other cranial autonomic symptoms and also restlessness and agitation [3]. Trigeminal neuralgia (TN) is also classed as a primary headache. TN is a chronic neuropathic pain disorder characterized by episodes of severe, short, electric shock-like headache in the area of trigeminal nerve [4,5]. Other very rare types of primary headache include primary cough headache, paroxysmal hemicrania and hemicrania continua, hypnic headache, short-lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), primary stabbing headache, primary thunderclap headache, primary headache associated with sexual activity, primary exertional headache, and new daily persistent headache [1].
According to data derived from Global Burden of Diseases, Injuries, and Risk Factors (GBD) studies, headache became major public health concern worldwide. In 2016, almost three billion individuals were diagnosed with headache disorder: 1.89 billion with TTH and 1.04 billion with migraine. The global age-standardized prevalence was 26.1% for TTH, and 14.4% for migraine [2]. Other types of headache are not so frequent: CH affects up to 0.1% of the population [3] and TN up to 0.3% [4]. It is reported that chronic headache (which occurs ≥15 days per month) affect up to 5% of the general population [6]. Chronic forms are connected with medication overuse, bad response to therapies and lower quality of life [6].
Primary headache often coexists with mood disorders like depression, and places a considerable burden on society, primarily due to treatment cost and work absence or presenteeism [7]. Treatment of primary headache consists of abortive and prophylactic therapy: the aim of abortive therapy is to stop headaches, while the goal of prophylactic therapy is to reduce headache attack frequency and severity, or disease progression. Besides pharmacological treatment, several minerals, vitamins and medicinal herbs, including vitamin D are recommended as headache supplementary treatment [8,9,10].

1.1. Metabolism and Functions of Vitamin D

Vitamin D deficiency is an emerging global health problem, affecting approximately 30–80% of children and adults worldwide [11,12]. The deficiency can occur due to several factors, mostly by inadequate sun exposure. Other risk factors include old age, darkly pigmented skin, latitude, winter season, clothing, sunscreen, air pollution, smoking, homebound, obesity, malabsorption, renal or liver disease and medications (including anticonvulsants, glucocorticoids, human immunodeficiency virus medications, and antirejection [11,12,13]. Sufficient levels of circulating vitamin D are mandatory for the absorption of several minerals, particularly calcium, but also phosphorus and magnesium [14].
There are two forms of vitamin D: D2 and D3. First one is acquired from ultraviolet (UV) irradiation of the yeast sterol, ergosterol, while vitamin D3 is produced from 7-dehydrocholesterol in the skin after exposure to UV radiation [14]. Vitamin D metabolism starts in the liver where it is converted to 25(OH)D by vitamin D-25-hydroxylase (an enzyme that, in humans, is encoded by the CYP2R1 gene-also known as cytochrome P450 2R1). The second metabolic step begins in the kidney, where 1-alpha-hydroxylase, an enzyme of the cytochrome P450 system, converts 25(OH)D to 1,25-(OH)2 D (or calcitriol, the biologically active form of vitamin D). Calcitriol then binds to vitamin D receptor (VDRs), which have been detected in almost every cell and tissue in the body [15,16]. By binding to these VDRs, vitamin D can control up to 200 genes connected with many health areas [14]. It is worth noting that the vitamin D bioactivity is a magnesium-dependent process because magnesium is an essential cofactor for vitamin D synthesis. As a result, activated vitamin D can increase intestinal absorption of magnesium. Moreover, there are evidences that magnesium supplementation can increase the effectiveness of vitamin D activity [17,18].
Vitamin D has numerous functions in the body, not only diminishing inflammation, but also influencing the immune systems, modulating cell growth, and controlling neuromuscular system [19,20]. In addition, vitamin D deficiency has been linked to many diseases and disorders, including infections, musculoskeletal disturbances, neuromuscular disorders, autoimmune diseases, diabetes and metabolic syndrome, lung and cardiovascular diseases, cognitive function and psychiatric disorders, and increased risk of some cancers [11,12,21]. Vitamin D deficiency is also connected with pain disorders, including fibromyalgia and headaches [12,22,23]. Despite these above-mentioned connections, causal relationships are yet to be established [22,24,25], and the underlying mechanism(s) by which vitamin D deficiency contributes to the above pathologies requires further investigation.
Another important issue is that a vitamin D status threshold level may be not sufficient enough to assess the individual requirements for vitamin D. Effectiveness of the molecular response to vitamin D, named as the vitamin D response index, differs between individuals. Thus the need for vitamin D supplementation may relay on the personal vitamin D response index rather than on the vitamin D status alone [26]. It should be also emphasized that the potency of vitamin D supplements from different manufacturers can vary widely [27].

1.2. The Role of Vitamin D in the Brain

As VDRs and 1-alpha-hydroxylase are present in many regions of the human brain (including the prefrontal cortex, thalamus, raphe, amygdala, cerebellum or, hippocampus), it is likely that vitamin D has specific functions in the central nervous system [15]. There is also evidence that vitamin D influence brain development: vitamin D deficient pups had larger brains, thinner neocortex and increased ventricular volume than controls in rodents [28]. Downregulation of genes controlling apoptosis is responsible for this changes in the brain, causing increased cellular proliferation [28]. Another important function of vitamin D is also regulation of the production of neurotrophic factors, (for example glial cell line-derived neurotrophic factor and nerve growth factor), thus it can act as a neuroprotective agent [16,28]. It is also a potent antioxidant, thus contributing to the vascular health of the brain [21]. Furthermore, vitamin D and its metabolites (as a steroid hormone) can influence many neurotransmitters, including dopamine, acetylcholine, and serotonin [23]. Indeed, some studies suggest vitamin D deficiency increases the risk of neurological diseases like stroke and dementia but also mood disorders [21]. Therefore, more and more data suggest they key role of vitamin D in maintaining brain health.

1.3. Vitamin D Deficiency and Pain

Several studies also indicate vitamin D deficiency can cause pain. In a meta-analysis of 81 observational studies, low vitamin D concentration was connected with arthritis, muscle pain, and chronic widespread pain [29]. However, the physiological mechanisms connecting vitamin D and pain is not fully known. The presence of VDR and vitamin D activating enzymes in the brain (especially the hypothalamus), and the influence of vitamin D on neurotransmitters, explains the connection between pain and vitamin D in fibromyalgia patients [15,23]. In addition, human and animal studies have shown insufficient vitamin D levels affect not only peripheral but also parasympathetic nerve function [23,30]. On the other hand, a Cochrane review published in 2015 showed vitamin D supplementation may not be better than placebo to control chronic pain in adults [31]. Therefore, there is some controversy surrounding the analgesic effects of vitamin D.
Kenis-Coskun et al. showed that although vitamin D replacement decrease pain and increase quality of life in patients with chronic widespread pain, it does not act via the spinal inhibitory circuit, ruling out any potential effect on the central pain sensitization mechanism [30]. In addition, other studies suggest the analgesic effect of vitamin D is more likely due to its anti-inflammatory action, rather than an anti-nociceptive effect [32]. Vitamin D appears to exert its anti-inflammatory effects by diminishing the release of pro-inflammatory cytokines and inhibiting T-cell responses [20]. For example, vitamin D shifts T-cell responses, increasing levels of T-helper (Th)-2 and regulatory T cells (Treg) instead of pro-inflammatory Th1 and Th17-cells [20,33]. In addition, in vitro studies show 25(OH)D inhibits the synthesis of prostaglandin E2 (PGE2) in fibroblasts [34]. There is also evidence that vitamin D supplementation stops musculoskeletal pain through diminished levels of inflammatory cytokines including PGE2 [35]. Thus, suppression of PGE2 is a credible explanation for the analgesic effect of vitamin D [35,36].

1.4. The Link between Vitamin D and Headache

In 2010, Prakash noticed that headache prevalence, including migraine, increase with increasing latitude [37]. Data also indicated that in autumn–winter frequency of headache attacks grow, while in summer, number of attacks decrease [37]. This pattern of headaches appears to match the serum vitamin D levels seasonal variations; however, the exact relationship between vitamin D deficiency and headache is somewhat enigmatic. Finding the link between vitamin D and migraine is made even more difficult due its complex pathophysiology, including metabolic, genetic, and hormonal elements that influence on the ability of the brain to process incoming sensory information [38]. Therefore, there are a number of ways by which vitamin D may influence primary headaches like migraines.
Inflammation plays a key role in migraine, whereby inflammatory substances produced by mast cells, mostly in the meninges, can activate the trigeminal nerve, a main structure involved in migraine headache [39,40]. Hence, the anti-inflammatory role of vitamin D may play an important part in migraine. In addition, in allergies, patients’ frequency of migraine attacks increases in certain seasons, which again suggests inflammation (and therefore vitamin D deficiency prompting excessive inflammation) may play an underlying role in primary headache. There is also an inverse association between the C-reactive protein (CRP, an inflammatory mediator) and vitamin D levels, and vitamin D supplementation can decrease inflammatory factors like CRP [33,41].
However, perhaps one of the most important mechanisms by which vitamin D deficiency could contribute to headache is through the possible sensitization of the second and third neurons, connected with stimulation of sensory receptors of the periosteal covering and central sensitization [30,42]. Another possible mechanism for headache associated with vitamin D deficiency is low serum levels of magnesium [43]. Magnesium plays an important role not only in neuromuscular conduction and nerve transmission, but also acts as a protective agent against excessive excitation causing neuronal cell death. The strong evidence exists regarding the close connection between magnesium and migraine, but also there are data suggesting a beneficial effect of magnesium for chronic pain conditions [44]. Intestinal absorption of magnesium depends on vitamin D, so diminished magnesium absorption due to vitamin D deficit may lead to TTH and migraine [17,18]. There is evidence that magnesium supplementation can be protective for migraine patients [8,9,10]. Thus, it is possible that the magnesium-associated benefit is partly mediated by vitamin D absorption and activation.
Vitamin D also reduces the production of nitric oxide (NO) by inhibiting the expression of NO synthase. NO is an important biological regulator that affects neurotransmission and vasodilation and is considered a key mediator in migraine [45]. During headaches attacks NO levels in jugular venous plasma increase; there are also evidence that NO synthase inhibitors are effective in treating migraine [46]. Moreover, in rodents, NO donors can enhance the release of the calcitonin gene-related protein (CGRP), which produce arterial vasodilatation and mast cell degranulation in the meninges. Moreover, NO controls the activity of spinal trigeminal neurons [46]. Therefore, it is possible that vitamin D diminish the frequency of migraine attacks by inhibiting NO synthase production.
Vitamin D also influence the release of dopamine and serotonin, which is known to be connected with the pathogenesis of migraine [38]. In particular, vitamin D can affect the synthesis of serotonin via tyrosine hydroxylase. So, in addition to its role in migraine pathogenesis, vitamin D deficiency may also cause depression, which often coexists with all types of headache [31].
More evidence of a potential connection between 25(OH)D and headache is the presence of VDRs, 1-alpha-hydroxylase, and the vitamin D binding protein (VDBP) in the brain, particularly in the hypothalamus [15,37,38,43]. In addition, the VDR gene, which is located on chromosome 12q, has several known polymorphisms that can produce different VDR proteins. The TaqI and FokI VDR polymorphisms have been shown to be associated with migraine without aura, and headache severity was found to be more significant in FokI heterozygote patients than in homozygote patients [47]. The explanation of this results is difficult, although may be connected with inflammation, because the relationship between polymorphisms of VDR, and susceptibility to several diseases associated with inflammation exist.
With regards to other types of primary headache, epidemiological studies show a strong relation between low serum vitamin D levels and chronic musculoskeletal pain. As chronic TTH patients can have generalized muscle pain, skull muscles tenderness, muscle atrophy and neck and other muscle weakness [48], it is speculated vitamin D deficiency is connected to TTH. In addition, CH shows a seasonal predilection, with nights attacks, suggesting involvement of the hypothalamus and vitamin D [3]. In particular, sunlight and vitamin D metabolism may be responsible for the diurnal and seasonal variation of CH. Indeed, evidence exists for diminished melatonin levels in CH patients, with decreased nocturnal serum melatonin levels during cluster periods [49].
Therefore, there are a number of possible connections between vitamin D deficiency and headache, as summarized in Figure 1. In this review article, we aimed to further examine the relationship between vitamin D and primary headache, and whether supplementation of vitamin D may be beneficial to certain patients.

2. Methods

This review included all articles regarding the connection between primary headache and vitamin D published up to October 2019. The list of studies was created by searching databases including: MEDLINE, EMBASE, PubMed, Google scholar, and the Cochrane library. Papers concerning the effects of vitamin D on headache were identified through a literature search. The following terminology and keywords were applied: “25-hydroxyvitamin D,” OR “vitamin D2,” OR “vitamin D3,” OR “ergosterol,” OR “cholecalciferol,” AND “headache”, OR “migraine,” OR “tension type headache,” OR “cluster headache,“ OR “trigeminal neuralgia,” OR “hemicranias,” OR “epidemiology,” OR “burden,” OR “treatment,” AND “immune function,” OR “inflammation,” OR “nociception,” OR “pain.” Only studies written in the English language were included. Articles including clinical trials, observational, cross-sectional and case-control studies and were included and reviewed.

3. Results and Discussion

Studies investigating vitamin D levels in association with primary headache are summarized in Table 1, and those studies that included the effect of vitamin D supplementation on headache are shown in Table 2. In most studies, vitamin D deficiency, insufficiency, and sufficiency were defined as <20, ≥20 and <30, and ≥30 ng/mL of 25(OH)D, respectively.

3.1. Vitamin D Deficiency and Tension-Type Headaches

Based on the studies published to date and summarized in Table 1, vitamin D deficiency is common among patients with TTH: low serum 25(OH)D levels were present in 67.2–73.0% of patients [22,57,60], and ranged from 13.5 to 16.9 ng/mL.
Prakash et al. examined 71 patients with chronic TTH, and found significantly lower mean 25(OH)D serum levels in subjects with musculoskeletal pain coexisting with headache comparing to those with headache only [22]. Similarly, patients having daily headaches had significantly lower serum vitamin D levels than those who had lower frequency of headaches [22]. The authors speculated that the coexistence of body pain and headache in a patient may be a symptom of a single disease, rather than two different disease or two separate mechanisms [22]. Moreover, if the mechanisms of musculoskeletal pain and of headache are the same and if osteomalacia of skull exist-headache may be a symptom of skull osteomalacia. Since headache can potentially coexist with pericranial tenderness, osteomalcia of the skull bone due to vitamin D deficiency could be a cause of TTH. The potential mechanism may be connected with swollen deposition of collagen rich osteoid on the periosteal surface of the skeleton which puts pressure on innervated periosteal covering. This continuous nociceptive inputs from the periphery because of swollen deposition of skull may sensitize the second and third order neurons and produce cephalic and extra cephalic pain. Another explanation is based on the study which demonstrated muscle hypersensitivity in rats receiving vitamin D-deficient diets. This muscles hypersensitivity together with and sensory hyperinnervation may exacerbate musculoskeletal pain [22]. Another study also showed 100 patients with chronic TTH had a significantly higher prevalence of musculoskeletal pain, muscle tenderness and weakness, and bone tenderness score compared to controls [60]. In addition, they showed vitamin D insufficiency was accompanied by an increased risk of chronic TTH [60]. Similarly, Hanci et al. found lower 25(OH)D levels in those with headache compared to controls, with not statistically significant difference [53].

3.2. The Role of Vitamin D in Migraine

Most studies revealed vitamin D deficiency or insufficiency in migraine patients, while some other studies showed normal vitamin D level (levels ranging from 12.40 to 38.08 ng/mL) [53,65]. Although some studies found no differences in vitamin D levels between the migraine and control groups [49,53,66], others found significant differences [54,55,65]. In particular, Togha et al. reported a higher serum vitamin D level (i.e., between 50 and 100 ng/mL) was associated with 80–83% lower odds of migraine headaches than those with serum levels below 20 ng/mL, after considering several confounding variables (including gender, age, and body mass index) [55]. They concluded that with each 5 ng/mL increase in serum 25(OH)D, there was 19–22% decreased odds of developing migraine [55]. Celikbilek et al. confirmed this observation: serum vitamin D and VDR levels were lower in migraineurs than in controls, with no significant differences in VDBP levels between the groups [65].
Meanwhile, a number of studies found no significant correlations between serum vitamin D levels and headache parameters, including aura, attack frequency, severity, and duration, and disease duration (Table 2). In particular, Montaghi and Zandifar showed no significant relationship between serum vitamin D and migraine severity [42,66]. In addition, some studies found no difference in serum 25(OH)D levels between episodic and chronic migraineurs [55,63]. Celibilek et al. also found no correlation between serum vitamin D, VDBP, and VDR levels and headache characteristics [65]. However, Rapsidaria et al. did discover a linear negative correlation between days with headache and serum vitamin D levels (Pearson’s correlation coefficient of 0.506; p < 0.001) [58], and Montaghi et al. observed a positive weak relationship between serum vitamin D level and headache diary result (p = 0.042, r = 0.19) [42]. Similarly, Song et al. found that a frequency of headache was related to vitamin D deficiency among migraineurs [56].
One study revealed a significantly higher incidence of aura, allodynia, phonophobia/photophobia, autonomic manifestations, and resistance to medications in migraineurs with vitamin D deficiency compared to those with normal vitamin D levels. There was also a statistically significant negative correlation between serum 25(OH)D level and the attack duration in hours (p < 0.001), frequency of the attacks/month (p < 0.001), migraine severity (MIGSEV) score (p = 0.001), and headache impact test (HIT)-6 score (p = 0.001) [54]. Likewise, a large population-based, cross-sectional study reported migraine severity was associated with vitamin D deficiency: the prevalence of moderate, major, and severe disability was higher among hospitalized migraineurs with vitamin D deficiency, and the mean length of stay and total cost of hospitalization increased (p < 0.001) [51]. Moreover, patients with vitamin D deficiency had a higher prevalence of migraine compared to those with hypocalcemia or without such deficiencies (3.0% vs. 1.5% vs. 1.6%, respectively; p < 0.0001) [51].
Furthermore, Buetner et al. noticed that in the presence of higher levels of vitamin D (57 nmol/l), statin use was associated with a significantly lower prevalence of severe headache or migraine, even after adjusting for multiple confounders (odds ratio [OR]: 0.48; 95% confidence interval [CI] 0.32–0.71, p < 0.001); however, no significant association between statin use and severe headache in those with low levels of vitamin D was observed [64].

3.3. Vitamin D in Cluster Headache

At present, only one study has examined serum vitamin D levels in patients with CH. Vitamin D deficiency was present in 92.8% of CH patients, with an average serum 25(OH)D concentration of 14.0 ± 3.9 ng/mL [49]. There was no difference in the serum 25(OH)D concentrations regarding gender, cluster and remission periods, first and recurrent attacks, or presence and absence of daily or seasonal periodicity. However, of the 14 patients with seasonal periodicity, those with a periodicity of winter to spring tended to have lower serum 25(OH)D concentrations than those with summer to autumn periodicity [49]. Therefore, more studies are required to confirm the relationship between vitamin D and CH, and determine whether supplementation may benefit these patients.

3.4. Association of Vitamin D with Trigeminal Neuralgia and Other Types of Primary Headache

Only one study examined the relationship between vitamin D and TN, and reported a significant decrease in vitamin D in patients compared to the control group [59]. There is currently no data regarding the association of vitamin D with other rare types of primary headache, including hemicrania, SUNCT, or hypnic headache.

3.5. Benefits of Vitamin D Supplementation in Headache

All except one study [24] showed a decrease in headache frequency after vitamin D supplementation (Table 2), and yet most studies revealed vitamin D supplementation had no impact on headache severity. A recent randomized, placebo-controlled parallel trial of vitamin D supplementation in patients with migraine showed a significant decrease in migraine frequency from baseline to week 24 compared with placebo (p < 0.001) [68]. The number of headache days reduced from 6.14 ± 3.60 to 3.28 ± 3.24 by the end of the trial in those taking vitamin D; however, there was no significant change in the migraine severity, pressure pain thresholds, or temporal summation [68]. Similarly, Buettner et al. proved that simvastatin plus vitamin D is beneficial for the prevention of headache in adults with episodic migraine, with the significant decrease in migraine frequency compared to placebo [69]. In the active treatment group, 8 patients (25%) experienced a 50% reduction in the number of migraine days at 12 weeks and 9 (29%) at 24 weeks post-randomization [69]. Simvastatin together with vitamin D was also associated with a significantly higher responder rate, and diminished migraine frequency, as well as doses of abortive migraine medications used [69].
Mottaghi et al. found no significant difference in the mean severity and duration of headache attacks due to vitamin D supplementation; however, migraine frequency was marginally reduced in the treatment group compared to controls (5.9 ± 7.0 vs. 7.0 ± 6.0; p = 0.06) [41]. In addition, the mean headache diary record was significantly lower in the treatment group compared to controls (85.0 ± 134.2 vs. 132.1 ± 147.1; p = 0.04) [41]. Similarly, a study among children with vitamin D insufficiency and deficiency showed migraine duration was significantly shorter (p < 0.001) after 6 months of vitamin D supplementation, and the migraine frequency, VAS scores, and PedMIDAS scores were all reduced [52]. In addition, Cayir et al. found the addition of vitamin D to current anti-migraine treatment (amitriptyline) reduced the number of migraine attacks in pediatric migraine patients compared with the group receiving amitriptyline treatment alone [72].
Conversely, Knutsen et al. concluded vitamin D supplementation had no significant effect on the occurrence, anatomical localization, and degree of pain parameters or headache [24]. This lack of effect may have been due to the low dose of daily vitamin D supplementation used in their study. In addition, the authors did not differentiate between the different types of headaches, so it is unclear what percentage of subjects were suffering migraines or other types of headache [24].
To date, no clinical trials have examined the influence of vitamin D supplementation specifically on TTH. In addition, only one poster has presented survey results of 110 CH sufferers using a daily dose of vitamin and mineral supplements, including 10,000 IU/day vitamin D3 and omega-3 fish oil as a CH preventative [71]. Overall, 80% of CH patients had significant reductions in frequency, duration, and severity of headache [71]. Therefore, although the initial results are promising, further studies on the benefits of vitamin D supplementation in the various types of headaches are warranted.
It is also worth noting that to date, vitamin D supplementation appears to be a safe form of treatment. Indeed, even at high doses of vitamin D (up to 10,000 IU/day), no major adverse events have been reported [71].

4. Conclusions

A large proportion of headache patients suffer from vitamin D deficiency. There is also some evidence indicating these patients have lower levels of vitamin D than healthy people. The strongest connection reported to date is between serum vitamin D levels and migraine headaches; more research is needed to establish connections between this vitamin and other types of headache. Although there is a link between vitamin D and headache frequency, a larger study should be performed to assess its connection with other headache characteristics. Based on our review of the current literature, there are not enough evidence to recommend vitamin D supplementation to all headache patients, but it may be beneficial in selected patients to reduce the frequency of headache, mainly in migraineurs, especially in those with vitamin D deficiency. Although, the optimal dose of vitamin D to be used in these patients requires determination.

Author Contributions

M.N. contributed to data analysis, interpretation of findings, and drafting the article, M.N., S.O. and M.W. participated in data collection, M.W. and H.K. participates in critical revision and final approval. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Conflicts of Interest

The authors declare no conflict of interest.

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Nutrients 12 00243 g001 550
Figure 1. Potential role (s) that vitamin D deficiency can play in headache. Abbreviations: CGRP—calcitonin gene-related protein, NO—nitric oxide, NOS—nitric oxide synthase, CRP—C-reactive protein, PGE2—prostaglandin E2, TN—trigeminal nerve, ↓—a decrease, ↑—an increase.
Figure 1. Potential role (s) that vitamin D deficiency can play in headache. Abbreviations: CGRP—calcitonin gene-related protein, NO—nitric oxide, NOS—nitric oxide synthase, CRP—C-reactive protein, PGE2—prostaglandin E2, TN—trigeminal nerve, ↓—a decrease, ↑—an increase.
Nutrients 12 00243 g001
Table
Table 1. Overview of studies investigating vitamin D serum levels in association with headache.
Table 1. Overview of studies investigating vitamin D serum levels in association with headache.
Author (Year)Study DesignStudy Group: Type of Headache (Number of Participants)Study Population Age (Years)Mean Serum Vitamin D Levels (ng/mL)ResultsAssociation
Gallelli (2019) [50]Prospective, single-blind, single-center, control-groupMigraine (n = 95)
Control (n = 120)		Range: 13–5415.4 Serum vitamin D levels were lower than the normal range in patients with migraines and controls.
Mean vitamin D values were significantly higher in the control group compared to the migraine group.		Associated
Patel (2019) [51]Retrospective, cross-sectionalMigraine (n = 446, 446) Range: 19–80No dataVitamin D deficiency elevated the odds of major/extreme loss of function.
There was higher prevalence and higher odds of migraine among vitamin D deficient patients compared to those with hypocalcemia or no-deficiency.		Associated
Kılıç (2019) [52]Retrospective studyMigraine (n = 92)Mean: 12.6No dataThere was increased migraine frequency, duration, and PedMIDAS scores in those with vitamin D deficiency and insufficiency.
Migraine frequency, duration, and PedMIDAS scores were significantly negatively related to serum vitamin D levels. 		Associated
Hanci (2019) [53]Retrospective, observationalMigraine (n = 165)
TTH (n = 116)
Control (n = 98)		Range: 5–17Migraine: 12.4 ± 7.7
TTH: 13.5 ± 9.9
Control: 13.4 ± 8.8		No significant differences in mean vitamin D levels among the three groupsNot associated
Hussain (2019) [54]Case-controlMigraine (n = 40)
Control (n = 40)		32.18
28.8		Migraine: 32.11
Control: 41.86		Vitamin D levels were significantly lower in those with migraines compared to controls
The incidence of aura, allodynia, phonophobia/photophobia, autonomic manifestations, and resistance to medications was increased vitamin D deficient patients with migraines than those with normal vitamin D levels.
Serum vitamin D levels were significantly negatively related to the frequency, duration, and severity of migraine headache attacks		Associated
Togha (2018) [55]Case-controlMigraine (n = 70)
Control (n = 70)		Mean: 37Migraine: 30
Control: 43		There were more subjects with vitamin D deficiency and insufficiency in the migraine group (53.7%) than the control group (26.1%).
Serum vitamin D levels were significantly negatively related to migraine headaches
Serum vitamin D levels in those with chronic migraine were not different to those in subjects with episodic migraine
Serum vitamin D levels showed no correlation with headache parameters.		Associated
Song (2018) [56]Retrospective, observationalMigraine (n = 157)Mean: 3715.9 ± 7.4The majority (94.9%) of subjects with migraine had vitamin D insufficiency.
Frequent monthly headache was 1.2 times more common in migraine patients with vitamin D deficiency than those without deficiency.		Associated
Donmez (2018) [57]Retrospective, case-controlMigraine (n = 68)
TTH (n = 79)
Control (n = 69)		Mean: 12.2Migraine: 17.3
TTH: 16.9
Control: 25.8		Serum vitamin D levels were significantly lower in the migraine and TTH groups compared with the control group.Associated
Sohn (2018) [49]Case-controlCH (n = 28)
Migraine (n = 36)
Control (n = 36)		CH: 38.2
Migraine: 35.1
Control: 35.4		CH: 14.0 ± 3.9
Migraine: 14.7 ± 5.9
Control: 14.6 ± 7.4 		The majority (92.8%) of those with CH had vitamin D deficiency.
There was no significant difference in vitamin D levels among patients with CH, migraine, or controls.
Patients with a headache periodicity during winter to spring showed a trend of lower serum vitamin D levels than those with periodicity during summer to autumn.		Not associated
Rapisarda (2018) [58]Case-controlCM (n = 100)
EM (n = 34)
Control (n = 38)		CM/EM: 41.4
Control: 47.6		CM: 12.7
EM: 17.2
Control: 23.0		Vitamin D deficiency was severe among headache patients (especially in those with CM) compared to healthy subjects.
Vitamin D levels were negatively correlated with the number of days of headache (Pearson’s correlation coefficient: 0.506)		Associated
Farajzadeh (2018) [59]Case-controlTN (n = 13)
Control (n = 13)		Mean: 53.3 TN: 22.61
Control: 39.80		Vitamin D levels were significantly decreased in patients with TN (before and after microvascular decompression) compared to the control group.Associated
Prakash (2017) [60]Case-controlChronic TTH (n = 100)
Control (n = 100)		Chronic TTH: 35.63
Control: 36.86		Chronic TTH: 14.7
Control: 27.4		Serum vitamin D levels were significantly lower in Chronic TTH patients than in controls.
Vitamin D deficiency was more prevalent in patients with Chronic TTH (71%) than controls (25%).
Chronic TTH patients with vitamin D deficiency had a higher prevalence of musculoskeletal pain, muscle weakness, muscle and bone tenderness score, associated fatigue, and a more prolonged course.
Serum vitamin D levels were positively correlated with the total muscle tenderness score.		Associated
Virtanen (2017) [61]Cross-sectionalSelf-reported frequent headache (n = 250)Range: 42–6038.3 nmol/LSerum vitamin D levels were lower in subjects with frequent headaches than other participants.
Serum vitamin D levels were inversely associated with frequent headaches.		Associated
Tozzi (2016) [62]Cross-sectional MWoA (n = 91)
MWA (n = 32)
TTH (n = 36)		Range: 5–18No dataSerum vitamin D levels were lower in children with MwoA than those with MWA and THH, albeit not significantly (p = 0.07).Not associated
Iannacchero (2015) [63]ObservationalMigraine (n = 22)Mean: 45.4113.05 ± 5.70Vitamin D levels were similar among those with CM than those with EM
Vitamin D levels were not significantly correlated with headache frequency.		Not associated
Buettner (2015) [64]Cross-sectional5938 participants from the National Health and Nutrition ExaminationNo dataNo dataPeople with serum vitamin D levels >57 nmol/l and use a statin had a lower prevalence of severe headache or migraine.Associated
Prakash (2013) [22]ObservationalChronic TTH (n = 71)Mean: 38No dataSerum vitamin D levels were significantly associated with headache, musculoskeletal pain, and osteomalacia.
Mean vitamin D levels were significantly lower in subjects suffering from daily headache compared to those with intermittent headaches.		Associated
Celikbilek (2014) [65]Cross-sectional, prospectiveMigraine (n = 52)
Control (n = 49)		Migraine: 35.88
Control: 34.24		Migraine: 38.08
Control: 48.03		Serum vitamin D and VDR levels were significantly lower in migraine patients than controls.
Serum VDBP levels were similar between the two groups.
Serum vitamin D, VDBP, and VDR levels showed no correlated with headache characteristics.		Associated
Zandifar (2014) [66]Case-controlMigraine (n = 105)
Control (n = 110)		Migraine: 33.59
Control: 32.46		Migraine: 13.55 ± 0.91
Control: 13.19 ± 1.19 		There was no significant difference in vitamin D levels among between case controls.
Severity of headache was not related to vitamin D levels. 		Not associated
Mottaghi (2013) [42]Cross-sectionalMigraine (n = 76)Mean: 33.123.3 ± 1.8Serum vitamin D were weakly positively associated with headache diary result but not related to migraine severity
High serum levels of 25-OH-D3 were related to a higher headache diary result.		Associated
Kjaergaard (2012) [67]Cross-sectional11,614 participants of the sixth survey of the Tromsø study in 2007–2008Range: 55–58No dataSerum vitamin D levels were inversely associated with non-migraine headache but there was no significant association between migraine and serum vitamin D.Associated
Knutsen (2014) [24]Cross-sectionalHeadache (n = 63)No dataNo dataMean serum vitamin D levels in patients with headaches were lower than in those suffering from musculoskeletal pain or fatigue.
Headache was inversely associated with hypovitaminosis D.		Associated
Abbreviations: CH–cluster headache; CM–chronic migraine; EM–episodic migraine; MWA–migraine with aura; MWoA–migraine without aura; PedMIDAS–Pediatric Migraine Disability Assessment; TN–trigeminal neuralgia; TTH–tension type headache; VDBP –vitamin D binding protein; VDR–vitamin D receptor.
Table
Table 2. Overview of studies evaluating the effect of vitamin D supplementation on headache parameters.
Table 2. Overview of studies evaluating the effect of vitamin D supplementation on headache parameters.
Author (Year)Study DesignStudy Group: Type of Headache (Number of Participants)Study Population Age (Years)Supplementation PeriodVitamin D DosageMean Serum 25(OH)D Levels (ng/mL) and/or 1,25(OH)2D (pg/mL) Before Treatment Mean Serum 25(OH)D Levels (ng/mL) and/or 1,25(OH)2D (pg/mL) After the TreatmentResults
Kılıç (2019) [52]ProspectiveMigraine (n = 42)Mean: 148 months2000 IU/day for 2 months, then 600–1000 IU/day of maintenance therapy for the next 6 months25(OH)D
9.4 (4.2–20)		25(OH)D
34.6 (16.3–45)		Decreased migraine duration, frequency, VAS scores, and PedMIDAS scores compared with baseline values.
No effect on headache severity.
Gazerani (2019) [68]Randomized, double-blind, placebo-controlled, parallelMigraine (n = 48)Mean: 45.5196 days100 μg/day25(OH)D 87.43 ± 32.00
1,25(OH)2D 43.55 ± 10.57		25(OH)D
Increased significantly
1, 25(OH)2D
No significant change
Values not provided		Decreased migraine frequency, but no effect on severity, pressure pain thresholds, or temporal summation.
Buettner (2016) [69]Randomized, placebo-controlledEpisodic migraine (n = 57)Mean: 4024 weeks1000 IU twice per day (+ simvastatin 20 mg/twice per day)25(OH)D
30 (18 to 41)
median (IQR)		25(OH)D
38 (34 to 45
median (IQR		Decreased number of migraine days.
Yilmaz (2016) [70]Pre-postHeadache (n = 29)Mean: 36.93 months50,000 IU/weekly + calcium of 1000 mg/day 25(OH)D
10.6 ± 5.1		25(OH)D
46.5 ± 24.0		Decreased headache severity and frequency.
Mottaghi (2015) [41]Randomized, double-blind placebo-controlled Migraine (n = 65)Range: 10–6510 weeks50,000 IU/week25(OH)D
16 ± 5.4		25(OH)D
No data		Decreased headache frequency and mean headache diary results, but no effect on the severity and duration of headache.
Knutsen (2014) [24]Randomized double-blinded placebo-controlled parallel-groupHeadache (n = 157)Range: 35–40 16 weeksGroup 1
25 μg/day
Group 2
10 μg/day		25(OH)D
Group 1 27
Group 2 25		25(OH)D
Group 1
increased by 25
Group 2
increased by 16		No effect on the occurrence, anatomical localization, and degree of pain parameters or headache frequency.
Batcheller (2014) [71]ProspectiveCluster headache (n = 110)No data30 days10,000 IU/day25(OH)D 23.425(OH)D 76Decreased frequency, severity, and duration of headache in 80% of patients.
Cayir (2014) [72]ProspectiveMigraine (n = 53)Range: 8–166 monthsGroup 1: amitriptyline alone
Group 2: 400 IU/day + amitriptyline
Group 3: 800 IU/day + amitriptyline
Group 4: 5000 IU/day + amitriptyline		Group 1
32.4 ± 2
Group 2
28.1 ± 1.8
Group 3
17.2 ± 0.3
Group 4:
10.9 ± 0.6		Group 1
33.7 ± 1.8
Group 2
34.1 ± 1.6
Group 3
25.6 ± 1.1
Group 4:
22.3 ± 1.9		Decreased headache attack frequency in groups 2, 3, and 4
Abbreviations: PedMIDAS–Pediatric Migraine Disability Assessment; VAS–visual assessment scale.

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Nowaczewska, M.; Wiciński, M.; Osiński, S.; Kaźmierczak, H. The Role of Vitamin D in Primary Headache–from Potential Mechanism to Treatment. Nutrients 2020, 12, 243. https://doi.org/10.3390/nu12010243

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Nowaczewska M, Wiciński M, Osiński S, Kaźmierczak H. The Role of Vitamin D in Primary Headache–from Potential Mechanism to Treatment. Nutrients. 2020; 12(1):243. https://doi.org/10.3390/nu12010243

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Nowaczewska, Magdalena, Michał Wiciński, Stanisław Osiński, and Henryk Kaźmierczak. 2020. "The Role of Vitamin D in Primary Headache–from Potential Mechanism to Treatment" Nutrients 12, no. 1: 243. https://doi.org/10.3390/nu12010243

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