When is imaging needed for migraine?

Many people with typical recurrent migraine do not need brain imaging every time they have an attack. Clinicians usually decide based on the pattern, exam, age, risk factors, and whether the story has red flags.

Imaging is more likely to be discussed when the headache is sudden and severe, new or changing, linked with abnormal neurologic findings, triggered by exertion in an unusual way, associated with fever or cancer history, or begins in a higher-risk setting such as pregnancy or after head injury.

What imaging can and cannot do

CT and MRI can help look for some structural or emergency causes of headache. They do not prove that a person has migraine, and a normal scan does not make symptoms imaginary. Migraine is a neurologic disease that is usually diagnosed from the clinical pattern.

What to bring to the appointment

• The date your headache pattern changed, if it changed.
• A list of neurologic symptoms such as weakness, numbness, vision loss, speech problems, confusion, fainting, or aura.
• Attack duration, medication timing, fever, injury, pregnancy status, and recent illness.
• Any family history or personal history your clinician has asked you to monitor.

If your clinician says imaging is not needed, ask what pattern changes should prompt a reassessment. That gives you a concrete safety plan instead of leaving you to guess.

Sources checked: Mayo Clinic diagnosis and treatment, NHS migraine, MedlinePlus migraine.

Does a normal MRI rule out migraine?

No. Migraine can exist with normal imaging because the diagnosis is usually based on symptoms, pattern, and clinical assessment.