Headaches / Migraine Headaches Category Clarifications/Special considerations I C a) Non-migrainous (mild or severe) 1 1 Clarification: Classification depends on accurate diagnosis of those severe headaches that are migrainous and those that are not. Any new headaches or marked changes in headaches should be evaluated. Classification is for women without any other risk factors for stroke. Risk of stroke increases with age, hypertension and smoking. b) Migraine i) withoutaura age < 35 years 1 2 age > 35 years 1 2 ii) with aura, at any age 2 3