title: Headache.
mesh_terms: D001927:Brain Diseases / Q000150:complications; D001930:Brain Injuries / Q000150:complications; D002560:Cerebrovascular Circulation; D003027:Cluster Headache / Q000209:etiology; D004569:Electroencephalography; D004734:Energy Metabolism; D004878:Ergotamine / Q000627:therapeutic use; D013700:Giant Cell Arteritis / Q000150:complications; D006212:Hallucinations / Q000209:etiology; D006261:Headache / Q000139:chemically induced / Q000209:etiology*; D006801:Humans; D008881:Migraine Disorders / Q000188:drug therapy / Q000209:etiology; D018377:Neurotransmitter Agents / Q000378:metabolism; D013315:Stress, Psychological / Q000150:complications; D014653:Vascular Headaches / Q000209:etiology; D014664:Vasodilation; D014796:Visual Perception
chemical_list: D018377:Neurotransmitter Agents; D004878:Ergotamine