A1.3 Chronic migraine (alternative criteria)

Alternative diagnostic criteria:

1. Headache (migraine-like or tension-type-like) on ≥15 days/month for >3 months and fulfilling criteria B and C
2. Occurring in a patient who has had at least five attacks fulfilling criteria B-D for 1.1 Migraine without aura and/or criteria B and C for 1.2 Migraine with aura
3. On ≥8 days/month for >3 months fulfilling any of the following:
   1. criteria C and D for 1.1 Migraine without aura
   2. criteria B and C for 1.2 Migraine with aura
   3. criteria A and B for 1.5 Probable migraine
4. Not better accounted for by another ICHD-3 diagnosis.