Explore the following important elements of the headache history: Headache onset (thunderclap, head or neck trauma), previous attacks (progression of symptoms), duration of attacks (< 3 hours, > 4 hours, continuous), days per month with headache Pain location (unilateral, bilateral, associated neck pain, etc) Headache-associated symptoms (nausea, vomiting, photophobia, conjunctival injection, rhinorrhea, etc) Relationship of headache attacks to precipitating factors (stress, posture, cough, exertion, straining, neck movement, jaw pain, etc) Headache severity and effect on work and family activities Acute and preventive medications tried, response, and side effects Presence of coexistent conditions that might influence treatment choice (insomnia, depression, anxiety, hypertension, asthma, and history of heart disease or stroke)

Based on expert opinion of the Guideline Development Group.