Table 6 Proposed diagnostic criteria for the three migraine without aura subtypes, and for transformed migraine

1.1.1 Infrequent migraine

 A. Headache fulfilling criteria C and D for 1.1 Migraine without aura on ≤3 days/month for ≥3 months

 B. Not attributed to another disorder

1.1.2 Frequent migraine

 A. Headache fulfilling criteria C and D for 1.1 Migraine without aura on >3 but <10 days/month for ≥3 months

 B. Not attributed to another disorder

1.1.3 Chronic migraine

 A. Headache fulfilling criteria C and D for 1.1 Migraine without aura on ≥10 but ≤20 days/month for ≥3 months

 B. Not attributed to another disorder

1.5.1 Transformed migraine

 A. Headache (tension-type and/or migraine) on >20 days/month for ≥1 year and never with more than 5 headache-free consecutive days

 B. Occurring in a patient who has had at least five attacks fulfilling criteria for 1.1 Migraine without aura

 C. On ≥10 days per month for ≥1 year headache has fulfilled criteria for pain and associated symptoms of migraine without aura or patient has been successfully treated with an ergot or triptan

 D. Not attributed to another disorder