title: On the origin of head pain.
mesh_terms: D001165:Arteriovenous Malformations / Q000150:complications; D001933:Brain Stem / Q000503:physiopathology; D002544:Cerebral Infarction / Q000150:complications; D003027:Cluster Headache / Q000503:physiopathology; D006261:Headache / Q000209:etiology*; D006801:Humans; D008881:Migraine Disorders / Q000503:physiopathology