Why Is Accurate Migraine Diagnosis Important?
A lot of headache conditions can look and feel similar to migraines, which is why getting the diagnosis right really matters.
- Migraines are often mistaken for tension headaches, which means people don't always get the treatment they actually need and end up suffering more than they should.
- The American Migraine Foundation (2022) suggests that around half of all people living with migraines are either undiagnosed or have been told they have something else entirely.
- Catching it early means the right treatments can be started sooner, which can make a real difference in how often attacks happen and how bad they feel.
- Accurate diagnosis prevents inappropriate medication use, including overuse of pain relievers that can cause medication overuse headache (MOH)
Medical History and Symptom Evaluation
The first and most important step in migraine diagnosis is a thorough medical history and symptom evaluation conducted by a doctor or neurologist.
Key Questions a Doctor Will Ask
- How often do headaches occur and how long do headache attacks last
- Where is the pain located and what does the pain feel like (throbbing, pressing, or stabbing)
- How severe is the pain on a scale of 1 to 10 and does pain worsen with physical activity
- Are there associated symptoms such as nausea, vomiting, or sensitivity to light and sound
- Are there any warning symptoms before the headache such as visual disturbances or tingling
- What triggers headaches and what makes headaches better or worse
- Is there a personal or family history of migraines or other headache disorders
- How significantly do headaches affect daily functioning, work, or school
The Headache Diary
A headache diary is one of the most valuable tools for migraine diagnosis and is often requested by doctors before or during the diagnostic process.
- Record the date, time, and duration of every headache attack
- Note pain severity on a scale of 1 to 10
- Document associated symptoms including nausea, light sensitivity, and visual disturbances
- Keep note of things that might be bringing on your headaches - whether it's a stressful week, changes in your sleep, your menstrual cycle, or something you've been eating or drinking differently.
- Write down any medications you've taken to get relief, and honestly note whether they actually helped or not.
- Try to keep the diary going for at least 4 to 8 weeks before your specialist visit - the longer you track, the clearer the patterns become, and the more useful it'll be for your doctor.
Physical and Neurological Examination
A physical and neurological examination is performed to identify any signs of an underlying condition that could be causing headaches.
Neurological Examination Components
- Checking your reflexes, how strong your muscles are, and whether your coordination feels off
- Testing your cranial nerves, things like how well you're seeing, how your eyes move, and whether you have normal feeling in your face
- Seeing how steady you are on your feet and watching how you walk
- A quick check on memory and speech to make sure everything's ticking along fine
- Feeling around your neck for any stiffness or soreness, this can point to either meningitis or headaches that are actually coming from your neck
A normal neurological examination in a person with a consistent headache history strongly supports a primary headache disorder such as migraine rather than a secondary cause.
Applying Diagnostic Criteria
Migraine diagnosis is confirmed by applying the standardized diagnostic criteria established by the International Headache Society.
Diagnostic Criteria for Migraine Without Aura
- At least five attacks lasting 4 to 72 hours without treatment
- At least two of the following pain characteristics: one-sided location, throbbing quality, moderate to severe intensity, worsening with physical activity
- At least one associated symptom: nausea or vomiting, photophobia, or phonophobia
- Symptoms not better explained by another diagnosis
Diagnostic Criteria for Migraine With Aura
- At least two attacks with fully reversible aura symptoms
- Aura symptoms including visual disturbances, sensory changes, or speech difficulty developing gradually over 5 to 20 minutes
- Each aura symptom lasting no longer than 60 minutes
- Headache beginning during or within 60 minutes of aura in most cases
When Are Imaging and Tests Needed?
Imaging and laboratory tests are not required for routine migraine diagnosis. However, investigations are necessary when red flag symptoms are present that suggest a secondary cause for headaches.
Red Flag Symptoms Requiring Urgent Investigation
- Sudden severe headache described as the worst headache of life (thunderclap headache), which may indicate subarachnoid hemorrhage (bleeding around the brain)
- New headache in a person over 50 years of age
- Headache with fever, stiff neck, or rash suggesting meningitis
- Headache with neurological symptoms such as weakness, speech difficulty, or vision loss that do not resolve
- Progressive worsening of headaches over weeks without a prior headache history
- Headache following head trauma or injury
- Headache in a person with a history of cancer or immunosuppression
Investigations Used When Red Flags Are Present
- Brain MRI: This is usually the go-to scan when doctors want a closer look at what's going on. It gives really detailed pictures of the brain's structure, blood vessels, and can pick up anything that looks out of the ordinary.
- Brain CT scan: This one tends to be used more in emergency situations, mainly to quickly rule out any bleeding in or around the brain.
- Lumbar puncture (spinal tap): Performed when meningitis or subarachnoid hemorrhage is suspected and CT scan results are inconclusive
- Blood tests: Used to rule out metabolic, inflammatory, or infectious causes of headache including thyroid dysfunction, anemia, and infection
Common Conditions That Mimic Migraines
Several conditions produce symptoms that overlap with migraines and must be excluded during the diagnostic process.
When Should You See a Specialist?
A GP can usually handle straightforward migraine cases without any issues. That said, it's worth seeing a neurologist or headache specialist when:
- The diagnosis isn't clear or something about the headache doesn't feel quite right
- Migraines are happening more than four days a month
- The usual treatments just aren't cutting it anymore
- Preventive treatment is needed and initial options have not been effective
- Chronic migraine or medication overuse headache is suspected
Conclusion
Migraines are diagnosed through a combination of detailed symptom history, neurological examination, and application of internationally recognized IHS diagnostic criteria. No single test confirms a migraine diagnosis. Imaging and laboratory investigations are reserved for cases with red flag symptoms suggesting a secondary cause. Keeping a detailed headache diary, seeking early medical evaluation, and working with a neurologist or headache specialist when needed are the most effective steps toward accurate diagnosis and appropriate treatment.
