Are there worrisome features (SNOOP)?10
	Systemic symptoms or illness (especially fever, change in mentation, anticoagulation, current or recent pregnancy, or cancer)
	Neurologic symptoms or signs (papilledema, asymmetric cranial nerve or motor function, or abnormal cerebellar function)
	Onset is recent or sudden
	Onset after 40 years of age
	Previous headache history is different or progressive
What is the primary headache type? (Determine original headache pattern and any changes over time)
	Duration longer than four hours
		Migraine features: chronic (transformed) migraine
		Lacking migraine features: chronic tension-type headache
		Abrupt onset headache pattern: new daily persistent headache
		Strictly unilateral: hemicrania continua
	Duration shorter than four hours
		Strictly unilateral/autonomic features: indomethacin-responsive headaches
		Unilateral or bilateral/no associated autonomic features
Evidence of medication overuse (including nonprescription drugs and caffeine)
Evidence for underlying physical factors
	Myofascial factors
		Cervical
		Temporomandibular
		Fibromyalgia
		Other chronic pain
	Sinus symptoms
	Sleep disturbance
Evidence for psychiatric comorbidity
	Depressive disorders
	Anxiety disorders
	Chemical dependency
	Personality disorders