Migraines: common triggers, nutritional links and biomarkers to check

Magnesium deficiency and neuronal excitability

Magnesium is one of the most consistently studied nutritional factors in migraine research. It plays a direct role in regulating neuronal excitability and preventing the cortical spreading depression that triggers migraine attacks. Studies have found that up to 50% of people experiencing migraine attacks have low serum or intracellular magnesium levels during an episode. Magnesium also regulates the NMDA receptor (involved in pain signalling) and supports blood vessel stability. Deficiency is common in the general population and easy to miss on standard blood panels, since serum magnesium can appear normal even when cellular stores are low.

Vitamin B12 status and homocysteine metabolism

Vitamin B12 has a well-documented relationship with migraine. Research has found that people with migraine have significantly lower B12 levels than healthy controls, and that higher B12 levels are associated with a meaningfully lower likelihood of having migraines. The biological mechanism runs through nitric oxide metabolism and homocysteine: B12 deficiency elevates homocysteine, which increases nitric oxide production and can trigger vasodilatation and neuroinflammation in the brain. For people with migraine with aura specifically, measuring both B12 and homocysteine provides a useful window into this pathway.

Vitamin D deficiency and neuroinflammation

Low vitamin D levels are consistently associated with higher migraine frequency. Vitamin D receptors are present in the brain, including the hypothalamus, and the active form of the vitamin has anti-inflammatory properties that may moderate migraine-related neuroinflammation. There is also an indirect pathway: vitamin D is required for intestinal magnesium absorption, which means that vitamin D deficiency can compound magnesium deficiency and worsen both pathways simultaneously. Testing both markers together provides a more complete picture than either in isolation.

Hormonal patterns and menstrual migraine

Oestrogen fluctuations are one of the most powerful migraine triggers in women. Migraines are approximately three times more common in women than men, and a large proportion of female migraineurs report attacks clustered around menstruation, when oestrogen drops sharply before the period. This pattern, often called menstrual migraine or hormonally triggered migraine, reflects sensitivity to oestrogen withdrawal at the trigeminovascular level. Perimenopause, when oestrogen levels become more erratic, is another common period of worsening frequency. Understanding the hormonal picture alongside nutritional biomarkers gives a more complete view of what is driving the pattern.

Inflammation and immune activation

Elevated markers of systemic inflammation, particularly C-reactive protein (CRP), are associated with both increased migraine frequency and greater severity. Neuroinflammation appears to play a role in sensitising the trigeminovascular system, the pain network involved in migraine attacks. Persistent low-grade inflammation (driven by poor diet, sedentary behaviour, sleep disruption, or gut dysbiosis) creates a biological environment that lowers the threshold for a migraine attack. Measuring CRP as part of a broader health panel identifies whether systemic inflammation is a background contributor to migraine frequency.

Thyroid dysregulation

Both hypothyroidism and hyperthyroidism are associated with increased headache and migraine frequency. Thyroid hormone directly influences blood vessel tone, neurotransmitter metabolism, and the body's overall inflammatory status: all mechanisms relevant to migraine pathophysiology. Subclinical hypothyroidism (elevated TSH with normal T4) is common and frequently missed, making thyroid function a worthwhile addition to any comprehensive migraine assessment, particularly in women and those with other symptoms of thyroid imbalance.

Sleep disruption, stress, and circadian patterns

Sleep disruption, both too little and too much, is among the most commonly reported migraine triggers. The relationship is bidirectional: migraines disrupt sleep, and poor sleep lowers the threshold for migraine attacks. Cortisol dysregulation from chronic stress creates a hormonal environment that sensitises the trigeminovascular system, and abrupt changes in routine (such as sleeping in at weekends or skipping meals) are well-established precipitants. While these are not blood biomarkers, they interact directly with the nutritional and inflammatory markers that are measurable.

Standard GP investigation for migraine typically focuses on excluding serious pathology (via neurological examination or imaging if indicated) rather than identifying the nutritional and inflammatory contributors that may be driving attack frequency. Vitamin B12, vitamin D, ferritin, and inflammatory markers are not routinely checked in a migraine assessment, leaving a significant gap in understanding what is perpetuating the pattern.

For people with recurrent or chronic migraines, a comprehensive blood panel covering the key nutritional and inflammatory markers provides a practical starting point for identifying modifiable contributors. This is not a diagnostic test for migraine itself, but an assessment of the biological terrain in which migraines are occurring.

A note on magnesium testing: serum magnesium is not included in the Optimal Bloods panel as a standard marker (since serum levels can be misleading and do not reflect intracellular stores accurately). If you specifically want to assess magnesium status, a red blood cell magnesium test (RBC magnesium) is a more accurate measure and can be requested through your GP or a private laboratory. If your GP has already excluded other pathology and migraines persist at high frequency, neurologist referral is appropriate for assessment of preventative medication options.

Nutrition and targeted micronutrient support

A growing body of clinical evidence supports supplementing key nutritional deficiencies to reduce migraine frequency. Magnesium supplementation (typically 300 to 600 mg daily of a bioavailable form such as magnesium glycinate or citrate) is recommended by several headache societies as a preventive approach for people with frequent migraines. Riboflavin (vitamin B2) at 400 mg daily has evidence for migraine prevention in clinical trials by supporting mitochondrial energy production in neurons. CoQ10, which supports the same energy pathway, has similarly been shown to reduce migraine frequency in several controlled studies. B12 and vitamin D supplementation are indicated where deficiencies are confirmed. Testing these markers before supplementing gives you a clear baseline and lets you track whether the intervention is working for your individual biology.

Sleep consistency and circadian routine

Maintaining consistent sleep and wake times, even at weekends, is one of the most effective behavioural interventions for reducing migraine frequency. This matters at a neurological level: the brain's pain processing and inflammatory systems are both strongly regulated by circadian rhythms, and disruptions in timing, rather than just quantity, are sufficient to lower the migraine threshold. Prioritising seven to nine hours of sleep and avoiding abrupt schedule changes reduces the trigger burden on an already sensitive system.

Blood sugar regulation and meal timing

Skipping meals and prolonged fasting are among the most consistently reported migraine triggers, driven by drops in blood glucose that stress the brain's energy supply. Eating at regular intervals and prioritising protein and healthy fats (which moderate blood sugar fluctuations compared to refined carbohydrates) creates a more stable neurological environment. Tracking HbA1c alongside migraine patterns can reveal whether suboptimal blood sugar regulation is a background contributor, particularly in people who report morning migraines or attacks that follow long gaps between meals.

Stress management and the HPA axis

Chronic stress increases cortisol output and sensitises the trigeminovascular system over time. Practices with evidence for cortisol modulation, including regular low-intensity exercise, structured relaxation, and sufficient recovery time, create measurable reductions in neurological sensitivity. The connection between stress and migraines is not simply behavioural: it is biochemical, running through the HPA axis and its influence on neurotransmitter balance, inflammatory signalling, and vascular tone. Addressing the physiological burden of chronic stress, rather than attempting to avoid individual stressors, provides a more durable foundation.