title: Early morning headache of Parkinson's disease: a hitherto unrecognized symptom?
mesh_terms: D000293:Adolescent; D000328:Adult; D002940:Circadian Rhythm; D005260:Female; D006261:Headache / Q000209:etiology* / Q000628:therapy; D006801:Humans; D007980:Levodopa / Q000008:administration & dosage; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D010300:Parkinson Disease / Q000150:complications* / Q000188:drug therapy; D012075:Remission, Spontaneous
chemical_list: D007980:Levodopa