title: Pathophysiology of headache.
mesh_terms: D002560:Cerebrovascular Circulation; D006261:Headache / Q000209:etiology / Q000503:physiopathology*; D006801:Humans; D008881:Migraine Disorders / Q000209:etiology / Q000503:physiopathology; D018377:Neurotransmitter Agents / Q000502:physiology; D013315:Stress, Psychological / Q000150:complications; D014653:Vascular Headaches / Q000209:etiology / Q000503:physiopathology
chemical_list: D018377:Neurotransmitter Agents