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Primary headache diagnosis algorithm

ETTH: episodic tension-type headache; CTTH: chronic tension-type headache; CM: chronic migraine; NDPH: new daily persistent headache; HC: hemicrania continua; ECH: episodic cluster headache; CCH: chronic cluster headache; EPH: episodic paroxysmal hemicrania; CPH: chronic paroxysmal hemicrania. PSH: primary stabbing headache. (Modified from: Lipton RB, et al. Classification of primary headaches. Neurology 2004;63(3):427-35.)