
Every year, between 2.5 and 4.6% of people who have episodic Migraine progress to chronic Migraine.
Migraineurs may transition among three Migraine states in both the direction of increasing Migraine frequency and decreasing Migraine frequency:
- 0 - 9 Migraine and headache days per month,
- 10 - 14 Migraine and headache days per month, and
- 15 or more Migraine and headache days per month.
These transitions occur over a period of weeks to a period of months.
For more information, see:
