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Living with Hemicrania continua

A long-lasting headache on one side of the head, with flare-ups of stronger migraine-like pain.

Understanding Hemicrania continua

Hemicrania continua is a primary headache disorder with constant pain on one side of the head and periods of more intense pain.

Primary means the headache is not caused by another medical condition. The pain stays on the same side and usually has no pain-free periods. Flare-ups can last from 20 minutes to days. It is more common in women and most often starts in adulthood.

Signs & symptoms

Symptoms vary from person to person. GARD lists these signs:

  • Constant mild to moderate pain on one side of the head
  • Flare-ups of severe, migraine-like pain
  • Watering or red eye on the same side
  • Stuffy or runny nose on the same side
  • Drooping eyelid on the same side

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

    Specialists who may be involved include brain and nervous system specialists.

  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
Brain and nervous system specialists (neurologists)
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 tests rule out other causes of my one-sided headache?
How can I track my flare-ups to share with my doctor?
Should I see a headache or neurology specialist?

Quick facts

GARD says the cause of hemicrania continua is unknown. Doctors diagnose it by ruling out other causes of the pain and by looking at the symptoms.

Neurological

Patient organizations

Source: NIH GARD · Hemicrania continuaGARD ID 10795 · 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 Hemicrania continua.

Explore the Hemicrania continua blog

Explore research for Hemicrania continua

Explore actively recruiting Hemicrania continua studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Hemicrania continua 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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