How do I know if I have Hemicrania Continua?

Hemicrania Continua is a rare primary headache disorder characterized by a continuous, strictly one-sided headache that fluctuates in intensity but never fully disappears. Diagnosis is uniquely confirmed by a complete, sustained response to the medication indomethacin, which acts as a clinical "litmus test" for the condition.

What are the early signs of Hemicrania Continua?

The hallmark of Hemicrania Continua is a persistent, daily headache that remains on the same side of the head. Unlike a standard migraine, the pain is constant. Many patients with Hemicrania Continua report "exacerbations" or spikes in pain intensity that can last from minutes to days. During these intense periods, you may experience autonomic symptoms on the affected side, such as a drooping eyelid, tearing, nasal congestion, or redness of the eye.

How can I track my symptoms for a doctor?

To differentiate Hemicrania Continua from other headache disorders, keep a detailed headache diary. Note the following patterns:

• Side-locked pain: Does the pain always remain on the same side of your head?


• Continuity: Is there ever a pain-free interval, or is the headache present every single day?


• Autonomic features: Do you experience eye tearing, ptosis (drooping eyelid), or nasal stuffiness during pain spikes?


• Indomethacin response: Have you ever taken indomethacin, and if so, did your symptoms vanish completely?

When should I seek urgent medical evaluation?

While Hemicrania Continua is a chronic condition, certain "red flag" symptoms require immediate emergency care to rule out secondary causes like tumors or vascular issues. Seek urgent help if you experience a "thunderclap" headache (the worst pain of your life reaching peak intensity within seconds), fever, neck stiffness, confusion, or sudden neurological deficits like weakness or vision loss.

How do I advocate for a diagnosis?

Because Hemicrania Continua is rare, it is often misdiagnosed as tension-type headache or migraine. If your concerns are dismissed, bring a copy of the International Classification of Headache Disorders (ICHD-3) criteria to your physician. Request a trial of indomethacin under medical supervision, as this is the gold standard for confirming Hemicrania Continua. With 86 members in our DiseaseMaps.org community living with this, you are not alone in your search for answers.

Next steps

• Consult a neurologist or a headache specialist who is familiar with rare autonomic cephalalgias.


• Download a headache tracking app to log your symptoms and triggers consistently.


• Join the Hemicrania Continua support group on DiseaseMaps.org to connect with others who understand your experience.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment.

References

• International Headache Society (ICHD-3) – Diagnostic criteria for Hemicrania Continua.


• NIH Genetic and Rare Diseases Information Center (GARD) – Hemicrania Continua overview.


• Orphanet – Rare disease database entry for Hemicrania Continua.


• American Migraine Foundation – Resources on indomethacin-responsive headaches.