Hemicrania Continua: A Patient Guide

Note on Medical Research: Throughout this guide, you will see bracketed codes (e.g., ^[1]). These indicate where factual statements and statistics are directly supported by published medical literature, clinical trials, or safety guidelines. This guide supports—but does not replace—individualized medical advice from your physician, particularly regarding medication dosing, MRI interpretation, and drug interactions.

Hemicrania Continua (HC) is a unique and rare primary headache disorder characterized by pain that never fully retreats. Unlike many other headaches that come and go in distinct attacks, HC is defined by a persistent, strictly one-sided ache that remains present 24 hours a day without completely pain-free periods ^[1]. On top of this constant background, patients experience “exacerbations”—spikes of intense pain that often bring about physical symptoms like eye watering, redness, or nasal congestion on the same side as the headache, or a feeling of restlessness ^[2]. This classification as a trigeminal autonomic cephalalgia (TAC) places it in a specific family of headaches that involve a complex relationship between the brain’s pain signaling pathways and the involuntary nervous system ^[3].

The defining hallmark of Hemicrania Continua is its relationship with a specific medication called indomethacin. For most patients, this drug provides what is known as an “absolute response,” meaning both the background ache and the severe spikes vanish completely ^[1]. This response is so predictable and dramatic that it is used as a primary tool for supporting the diagnosis. However, achieving relief through medication is not the end of the diagnostic process. Because several underlying issues, such as small pituitary masses or vascular changes, can mimic HC and even respond to the same treatment, a specialized brain MRI—directed by your care team—is considered an essential step to ensure the condition is primary and not caused by another medical issue ^[4][5].

Managing life with Hemicrania Continua involves a careful balance between maintaining total pain freedom and protecting your long-term health. While indomethacin is a revolutionary treatment for this condition, it is a potent medication that requires close supervision to avoid risks such as gastrointestinal irritation or kidney stress ^[6]. This guide is designed to help you navigate each step of this process, from understanding your specific symptom profile and the nuances of the indomethacin trial to building a specialized care team and exploring alternatives if standard therapy isn’t an option. By becoming an active partner in your care, many people obtain complete or substantial control, though the necessary dose, tolerability, and long-term outcomes vary for each individual ^[7].