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Living with Familial hemiplegic migraine

An inherited type of migraine with an aura that includes temporary weakness on one side of the body.

Understanding Familial hemiplegic migraine

Familial hemiplegic migraine is a form of migraine headache that runs in families.

Migraines cause intense, throbbing pain, often with nausea and sensitivity to light and sound. They typically start in childhood or the teen years. Before the headache, an aura can cause visual changes and temporary numbness or weakness on one side. Some people have severe episodes with fever, seizures, or prolonged weakness. About 20 percent develop mild, lasting trouble with coordination.

Signs & symptoms

GARD describes these symptoms in its summary:

  • Throbbing headache on one side
  • Nausea and vomiting
  • Sensitivity to light and sound
  • Visual aura (blind spots, flashing lights)
  • Temporary numbness or weakness on one side (hemiparesis)
  • Trouble with speech or confusion during an aura

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Your doctor may refer you to a specialist who knows rare conditions.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

  4. Connect with expert centers

    American Migraine Foundation may keep lists of experts for this condition.

Care & treatment

Care team
A doctor familiar with rare conditions, plus specialists as needed
Expert care
Expert lists: American Migraine Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with American Migraine Foundation
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
What can I do to prevent attacks and avoid triggers?
What should I do during an attack with weakness?
Can genetic testing help confirm the diagnosis?

Quick facts

GARD says it runs in families. It does not name a specific gene in the information provided.

Also known as: fhm; hemiplegic-ophthalmoplegic migraine; hereditary hemiplegic migraine

Patient organizations

Source: NIH GARD · Familial hemiplegic migraineGARD ID 10975 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Familial hemiplegic migraine.

Explore the Familial hemiplegic migraine blog

Explore research for Familial hemiplegic migraine

Explore actively recruiting Familial hemiplegic migraine studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Familial hemiplegic migraine with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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