Headache root causes: why "just a headache" is often more than that

Most people treat headaches as a random annoyance or a stress response. Take a pill, push through, repeat.

But headache is usually a threshold disorder. Your brain has a set point at which it starts generating pain. Multiple loads push that threshold down until the system tips. The work is finding which loads are active in you.

First: rule out the serious causes

Before any root-cause work, certain features need medical review: thunderclap onset, neurological symptoms such as weakness, confusion or vision changes, fever, new headache over age 50, progressive worsening, or headache after trauma. In pregnancy or postpartum, new or changing headache also needs blood pressure checked. These are not the common patterns, but they matter.

The strongest functional drivers

1. Brain energy deficit

Migraine brains often run an energy shortfall. Magnetic resonance studies show hypometabolism and higher oxidative stress during attacks. This is why magnesium, riboflavin (vitamin B2) and CoQ10 have the best evidence as preventives, they support mitochondrial energy production.

Clinical clues: headaches with skipped meals, long overnight fasts, or blood sugar crashes.

2. Inflammatory fat balance

A well-conducted trial found that raising omega-3 while lowering omega-6 linoleic acid reduced headache days by about four per month. Oily fish helps; seed oils and the ultra-processed foods built on them work against you. Supplementation alone only tests half the intervention.

3. Hormonal shifts

It is the fall in oestrogen, not the absolute level, that most often triggers menstrual migraine. Attacks commonly land in the window from two days before bleeding starts to day three. The same mechanism helps explain why some women worsen in perimenopause and why migraine often settles after menopause. Postpartum is another high-risk window because of the steep hormone drop plus sleep loss and nutrient depletion.

4. Key nutrient gaps

• Magnesium, level B evidence for migraine prevention
• Vitamin D, lower levels are common in migraine; supplementation has reduced attack frequency in trials
• Iron and ferritin, especially relevant with heavy periods, postpartum, or fatigue. Non-anaemic iron deficiency is easy to miss if only haemoglobin is checked
• B vitamins and homocysteine, most relevant in migraine with aura; some people improve when homocysteine is lowered

5. Thyroid

Headache attributed to hypothyroidism is recognised in the international classification. It is often bilateral, dull and constant. Even subclinical thyroid problems can contribute. Full thyroid panels, not just TSH, are useful in chronic or treatment-resistant cases, particularly postpartum.

6. Medication overuse

If you have headache on 15 or more days a month and are taking pain relief most days, medication overuse headache must be considered first. Simple analgesics on 15+ days, or triptans or combination pills on 10+ days, for three months or more, can themselves perpetuate the problem. Withdrawal needs proper support.

How the pieces fit together

Structural load, neck, jaw, posture, lowers the threshold. Metabolic, hormonal and nutrient factors set the baseline. Sleep, blood sugar and medication use influence how easily the system tips.

Most people who improve long-term address more than one layer.

A practical starting point

Keep a simple four to eight week diary: date, time, severity, cycle day, sleep, meals, and medications. Patterns jump out quickly.

Bottom line

Headaches are rarely random. It is usually the brain signalling that its energy supply, inflammatory balance, hormonal environment, nutrient status or structural load has crossed a threshold.

Identifying the main drivers turns "I just get headaches" into a solvable problem.

This is educational, not personal medical advice. Persistent, severe, or changing headaches require proper clinical assessment. Red-flag features need prompt medical review.