Getting a Migraine Diagnosis: Tests and Evaluations
Most people walk into a headache appointment expecting a test. A scan, a blood panel, something that produces a result and settles the question. It's a reasonable expectation, and it's wrong — which is why so many people leave a migraine diagnosis feeling vaguely unconvinced, as though nothing was really checked.
Something was checked. Migraine is a clinical diagnosis: it's identified from your history and examination, measured against a defined set of criteria. No imaging confirms it, because there's nothing structural to see. Understanding what that process is — and what tests are genuinely for — makes the whole thing far less unsatisfying.
The criteria are specific
Migraine isn't diagnosed on vibes. Headache specialists work from the International Classification of Headache Disorders, which sets out explicit criteria. For migraine without aura — the most common form — the picture is roughly this:
You've had at least five attacks meeting the description. Untreated, they last somewhere between 4 and 72 hours. The headache has at least two of these four features: it's one-sided; it's pulsating or throbbing; it's moderate to severe; and routine physical activity makes it worse or makes you avoid it. And during the attack you have at least one of: nausea or vomiting, or sensitivity to both light and sound.
Migraine with aura is defined separately, around reversible neurological symptoms — most often visual — that typically develop over several minutes and last under an hour, usually followed by headache.
Two things follow from seeing this laid out. First, the "at least five attacks" clause is why a single bad headache can't be diagnosed as migraine, however textbook it looks. Second, this is exactly why your history is the test — every one of these criteria is something only you can report.
What the appointment actually involves
The history is the main event and takes most of the time. Expect questions about how long you've had headaches, how often they come, how long they run, where the pain sits and what it feels like, what accompanies them, what makes them better or worse, what you've tried, your family history, and how much of your life they're taking. A written record makes this section vastly more productive.
The physical and neurological examination is quicker and its purpose is often misunderstood. Your doctor may check blood pressure, look at the back of your eyes, and test cranial nerves, strength, reflexes, coordination, and balance. In migraine, this exam is typically normal between attacks — and that's not a null result, it's a meaningful one. A normal exam alongside a textbook history is strong evidence that nothing else is going on, and it's a large part of why imaging often isn't needed.
Why you probably don't need a scan
This is the part worth internalizing, because it's the source of most of the dissatisfaction.
For someone with a typical migraine history and a normal neurological examination, routine brain imaging is not generally recommended — by headache specialists, not by insurers looking to save money. The reason is straightforward: the odds of finding something meaningful are very low, and scans carry their own costs. Incidental findings are common, most are harmless, and each one tends to generate follow-up scans and anxiety out of proportion to any benefit. A negative scan also provides only temporary reassurance, because it was never going to show migraine in the first place.
So when your doctor says you don't need an MRI, that isn't dismissal. It's the evidence-based answer, and it's a statement of confidence: your history fits and your exam is clean.
When imaging is warranted
Imaging exists to rule out secondary headache — a headache caused by something else. Clinicians look for red flags, often summarized by the mnemonic SNOOP. Broadly, the features that raise concern include:
- Systemic signs — fever, weight loss, or a condition affecting the immune system.
- Neurological signs — an abnormal exam, weakness, persistent numbness, confusion, or seizures.
- Onset that's sudden and severe — the "thunderclap" headache reaching maximum intensity within seconds to a minute. This is an emergency.
- Older age at onset — a new headache disorder starting after 50.
- Pattern change — a headache markedly different from your usual, or one that's progressively worsening. Also headaches triggered by coughing, exertion, or sex, or ones that consistently wake you from sleep.
If any of these are present, imaging becomes appropriate — not to find migraine, but to exclude something else. Blood tests work the same way: they don't diagnose migraine, but they can check for conditions that mimic it.
How Pressure Pal helps
Since the diagnosis rests on your history, and the criteria are as specific as they are, the practical question becomes how you supply that information accurately. Frequency, duration, associated symptoms, whether activity makes it worse — that's a lot to reconstruct from memory, and memory for past pain is notoriously unreliable.
Pressure Pal gives you the record instead. It tracks the barometric pressure trend automatically and lets you log attacks against it, so you can answer the criteria questions from data: how many attacks, how long each ran, what came with them. That maps directly onto what your doctor needs to check.
The weather dimension adds something the criteria don't ask about but treatment planning cares about — your triggers. Pressure sensitivity is common and effectively impossible to confirm without a log, since it only shows up as a pattern across many attacks. Establishing it turns a diagnosis into something actionable: you know what to watch, and you can see the risky days coming.
Bottom line
Migraine is diagnosed clinically, from a history checked against defined criteria and an examination that's expected to be normal. No scan proves it, and for a typical presentation you likely don't need one — imaging is for ruling out other causes when red flags appear, not for confirming migraine. That makes your account the diagnostic instrument, so bring a real record. And know the red flags: a thunderclap headache, new neurological symptoms, a new headache after 50, or a clear change in your usual pattern all warrant prompt attention.
This article is for general education and isn't a substitute for professional care. Always consult a qualified healthcare professional about diagnosis and treatment. Seek emergency care for a sudden severe "worst ever" headache, a headache after a head injury, or one with fever, a stiff neck, weakness, vision changes, seizures, or confusion.