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What Are Chronic Migraines?

User BrunoVT
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Answer:

Chronic migraine is defined as having at least 15 headache days a month, with at least 8 days of having headaches with migraine features, for more than 3 months. Chronic headache begins as less frequent headache episodes that gradually change into a more frequent headache pattern.

Step-by-step explanation:

User Raj Subbiah
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