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| Headache Disorders Analgesic Overuse Headache | Cephalgia Syndromes | Chronic Headache | Post-Traumatic Headache | Analgesic Rebound Headache | Benign Exertional Headache | Cervicogenic Headache | Chronic Daily Headache | Headache Syndromes | Headache, Intractable Common conditions characterized by persistent or recurrent headaches (see HEADACHE). Headache syndrome classification systems may be based on etiology (e.g., VASCULAR HEADACHE, post-traumatic headaches, etc.), temporal pattern (e.g., CLUSTER HEADACHE, paroxysmal hemicrania, etc.), and precipitating factors (e.g., cough headache). |