Migraines are not just headaches: the real root causes
Migraine is not just a bad headache. It is a neurological disorder that can involve pain, nausea, light sensitivity, sound sensitivity, aura, brain fog, fatigue, neck discomfort, dizziness and a post-attack "hangover". The root cause is usually not one food, one hormone or one neck muscle, but a migraine-prone nervous system shaped by genetics, sensory processing, hormones, sleep, stress physiology and medication patterns.1
Key facts
- Migraine is diagnosed by pattern: repeated attacks with typical features, not by a brain scan in most routine cases.2
- Modern migraine science focuses on neural networks, trigeminovascular pathways, CGRP and other neurochemicals, not the old idea that migraine is simply blood vessels dilating.4
- Triggers are not root causes. Poor sleep, missed meals, alcohol, hormone shifts or bright light may start attacks in a susceptible brain, but avoiding every possible trigger is rarely realistic.
- Medication overuse can turn occasional migraine into a more frequent headache pattern, so acute medicine use needs a plan.3
- Sudden, new, severe or neurologically unusual headaches need urgent assessment because not every severe headache is migraine.
Why migraine is not just a headache
The headache phase is only one part of migraine. Many people notice warning symptoms hours or a day before pain: yawning, food craving, thirst, mood change, neck stiffness, tiredness, sensitivity to light, difficulty concentrating or frequent urination. Some people get aura, often visual symptoms such as zigzag lines, blind spots or shimmering lights, but aura can also involve sensory or speech symptoms. After pain improves, the postdrome can leave people washed out, slow, tender and cognitively foggy.
The International Classification of Headache Disorders describes migraine without aura as recurrent attacks lasting 4 to 72 hours, with features such as unilateral location, pulsating quality, moderate or severe intensity, worsening with routine activity, and nausea or light and sound sensitivity.2 Not every attack ticks every box, and not every person has one-sided throbbing pain, which is why pattern over time matters.
Seeing migraine as a whole-body neurological attack changes the question. You stop asking only "what made my head hurt?" and start asking "why is my nervous system entering this attack state so often?" That opens up better targets: sleep stability, acute medicine timing, prevention, hormones, neck and jaw contributors, caffeine patterns, sensory overload and coexisting conditions.
Evidence grade: migraine is a real neurological disorder with recognised diagnostic criteria. Individual triggers are harder to prove because they vary by person and can be confused with early warning symptoms.
The real root causes and mechanisms
There is no single migraine root cause. Current reviews describe migraine as a brain disorder involving multiple regions and neurochemical systems. CGRP, pituitary adenylate cyclase-activating polypeptide, serotonin systems, brainstem pathways, hypothalamic networks and trigeminovascular pain signalling are all part of the modern model.4
Genetic susceptibility matters. Migraine often runs in families, although ordinary migraine is usually polygenic rather than caused by one mutation. A susceptible nervous system may be more sensitive to sensory input, sleep disruption, fasting, hormonal fluctuation, stress recovery, alcohol, weather changes or medication overuse. These are not moral failures. They are thresholds.
Aura is one example of mechanism becoming visible. Many aura symptoms are thought to relate to cortical spreading depression, a wave of altered electrical and chemical activity across the brain cortex. Pain then involves trigeminal pathways, meningeal vessels, inflammatory signalling and neuropeptides such as CGRP. This is why newer migraine medicines target CGRP pathways, while triptans target serotonin receptors and are used early in attacks for some people.
Hormones can be a major amplifier, especially in people who menstruate. A 2024 review reported that menstrually related migraine affects 35% to 54% of females with migraine during fertile years and is driven largely by hormonal fluctuations in genetically susceptible people with altered brain structures and connectivity.5 This does not mean every migraine is hormonal, but it means cycle tracking can be clinically useful.
Triggers that get mistaken for causes
Triggers are real for many people, but they are often overinterpreted. If chocolate appears before an attack, it might be a trigger, or it might be a craving from the premonitory phase that had already begun. If neck pain appears first, it might be a neck trigger, or it might be part of the migraine process itself. If stress seems to cause weekend attacks, the trigger may be the let-down after stress, sleep timing, caffeine timing or missed meals.
| Suspected cause | What may be happening | Better next step |
|---|---|---|
| Food triggers | Alcohol, missed meals and dehydration are common. Specific foods vary and cravings can be mistaken for triggers. | Use a diary before cutting whole food groups. |
| Hormones | Oestrogen withdrawal, periods, perimenopause, contraception or HRT can alter attack timing. | Track attacks against cycle dates and ask about migraine with aura before changing hormones. |
| Neck pain | Neck stiffness can be part of migraine, a trigger, or a separate musculoskeletal problem. | Look for timing, neurological symptoms, injury and whether treating migraine reduces neck symptoms. |
| Sinus headache | Migraine can cause facial pressure, watery eyes and nasal symptoms, so it is often mislabelled as sinus pain. | Check whether attacks include nausea, light sensitivity, movement worsening or repeated episodes. |
| Stress | Stress changes sleep, meals, muscle tension, hormones and recovery. Attacks may happen during the let-down phase. | Stabilise sleep, meals, hydration and decompression rather than trying to remove all stress. |
| Too much pain relief | Frequent acute medicines can maintain headache frequency in susceptible people. | Ask for a medication-overuse plan and prevention if attacks are frequent. |
| Blood pressure or brain tumour fear | Most recurrent migraine is not caused by a tumour, but red-flag headache patterns need assessment. | Use red flags and examination findings, not fear alone, to decide urgency. |
A migraine diary should be short enough that you actually use it. Record date, start time, pain side, aura, nausea, light or sound sensitivity, period date, sleep, alcohol, missed meals, caffeine, acute medicine, response, and whether you were able to work or function. After two or three months, patterns are often clearer than they feel from memory.
When to worry about another cause
A familiar migraine pattern is different from a new dangerous headache. NICE headache guidance includes urgent assessment for features such as thunderclap onset, new neurological symptoms, new cognitive dysfunction, personality change, impaired consciousness, recent head trauma, headache triggered by cough or exertion, headache with fever, neck stiffness or rash, new headache in pregnancy or soon after childbirth, new headache in people with cancer or HIV, and new headache after age 50.3
Call 999 for sudden worst-ever headache, stroke symptoms, seizure, collapse, new weakness, facial droop, speech difficulty, confusion, meningitis symptoms, severe headache after injury, or a headache with loss of consciousness. Same-day urgent advice is also sensible if a headache is clearly different from your usual migraine, escalating quickly, waking you repeatedly, or accompanied by persistent vomiting, vision loss, fever or new neurological symptoms.
Safety point: do not assume a severe new headache is migraine just because you have had migraine before. Pattern change is one of the most important clues.
What better treatment is trying to do
Better migraine treatment is not just stronger pain relief. It is a plan that reduces attack frequency, treats attacks early, prevents medication overuse, manages triggers without fear, and checks whether the diagnosis is right. NHS advice lists common treatments such as painkillers, triptans and anti-sickness medicines, and notes that prevention may be considered for frequent or severe migraine.1
NICE guidance recommends considering combination acute treatment with an oral triptan plus an NSAID or paracetamol, and anti-emetics where appropriate, while avoiding opioids for migraine.3 It also advises considering preventives such as topiramate or propranolol according to suitability, and other options when needed. The exact choice depends on asthma, blood pressure, pregnancy possibility, contraception, mood, weight, sleep, other medicines and whether aura is present.
Medication overuse deserves special attention. NICE says medication overuse headache should be suspected when headache develops or worsens while taking triptans, opioids, ergots or combination analgesics for 10 days or more per month, or paracetamol, aspirin or NSAIDs for 15 days or more per month, for more than three months.3 This is not addiction language. It is a brain-sensitisation problem that needs a structured withdrawal and prevention plan.
Use the health library to compare migraine with other causes of headache, and insights when you want the evidence behind a supplement, medicine or trigger claim. If you use magnesium, riboflavin, CoQ10 or herbal products, put them through the stack builder before combining them with prescribed medicines.
What to ask your GP
A GP appointment is more useful when you bring the pattern. Take your diary, a list of acute medicines used each month, contraception or HRT details, blood pressure readings if available, and a summary of red flags or pattern changes. If you need help turning this into a concise appointment plan, Start here.
- Does my pattern meet migraine criteria, or are there features that suggest another headache diagnosis?
- Do I have any red flags that need urgent imaging, same-day assessment or specialist referral?
- Am I at risk of medication overuse headache based on how often I use triptans, NSAIDs, paracetamol or combination painkillers?
- Should I have an acute plan, a preventive medicine, anti-sickness treatment, or a referral to a headache clinic?
- If my attacks cluster around periods, perimenopause, contraception or HRT, what hormone-safe options are appropriate, especially if I have aura?
The real root of migraine is a nervous system that can enter a recurring attack state. Treatment works best when it respects that biology: rule out red flags, diagnose the pattern, treat early, reduce attack frequency, avoid medication overuse, and track the triggers that genuinely apply to you.
References
- NHS, reviewed 2025. Migraine. link
- International Headache Society, 2018. ICHD-3: 1.1 Migraine without aura. link
- NICE, updated 2025. Headaches in over 12s: diagnosis and management, CG150 recommendations. link
- Karsan N, 2024. Pathophysiology of Migraine. Continuum. link
- De Matteis E, Ornello R, Sacco S, 2024. Menstrually associated migraine. Handbook of Clinical Neurology. link
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This article is educational and does not constitute medical advice, diagnosis, or a treatment recommendation. Medication uses described as “off-label” are not licensed for that purpose in the UK and should only be considered under qualified clinical supervision. Always speak to your GP, pharmacist, or a registered specialist before starting, stopping, or changing any treatment. If you have severe or alarm symptoms - unintentional weight loss, blood in your stool, difficulty swallowing, persistent vomiting, a fever, or severe pain - seek urgent medical care.