Episodic Migraine Definition Jun 2026

15 or more headache days per month for at least three months, with at least eight of those days meeting migraine criteria.

| Feature | Episodic Migraine (EM) | Chronic Migraine (CM) | | :--- | :--- | :--- | | | < 15 headache days per month | ≥ 15 headache days per month | | Duration | 3 months of observation required | Must have lasted > 3 months | | Nature | Discrete attacks with pain-free intervals in between | Often constant or near-constant pain; distinct attacks may blur | | Transition | Prodromal Stage | Complication of Migraine | | Risk of Progression | Can progress to Chronic Migraine | May remit back to Episodic Migraine | episodic migraine definition

This type is characterized by transient focal neurological symptoms that usually precede or accompany the headache. 15 or more headache days per month for

The primary differentiator for "episodic" status is frequency. episodic migraine definition