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What is a chronic migraine?

Dr. Nancy Shannon

Medically reviewed by Dr. Nancy Shannon, MD, PhD on August 18, 2020

Chronic migraines are diagnosed when a patient experiences a headache on 15 or more days per month for more than three months, with at least eight of those headaches having migraine features. Headaches experienced in patients with chronic migraines may be migraines with aura or migraines without aura.

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