title: Headache mechanisms. I.
mesh_terms: D001932:Brain Neoplasms / Q000150:complications; D006259:Craniocerebral Trauma / Q000150:complications; D006261:Headache / Q000209:etiology; D006801:Humans; D008881:Migraine Disorders / Q000209:etiology / Q000235:genetics; D009119:Muscle Contraction; D010551:Personality; D012008:Recurrence; D014653:Vascular Headaches / Q000209:etiology