title: Predisposing, precipitating and relieving factors in different categories of headache.
mesh_terms: D000328:Adult; D000700:Analgesics / Q000627:therapeutic use; D003027:Cluster Headache / Q000209:etiology; D005260:Female; D006261:Headache / Q000188:drug therapy / Q000209:etiology*; D006801:Humans; D008297:Male; D008881:Migraine Disorders / Q000209:etiology; D009119:Muscle Contraction / Q000187:drug effects; D014653:Vascular Headaches / Q000209:etiology
chemical_list: D000700:Analgesics