title: Olfactory disturbances in Parkinsonism.
abstract: Disturbance of smell should be regarded as a common symptom of Parkinson's disease. It often presents as a precursor of the motor disability. The common underlying cause might be the deficiency of catecholamines in the brain of Parkinson patients, especially in the mesolimbic projection areas.
mesh_terms: D004193:Discrimination Learning; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D000857:Olfaction Disorders / Q000209:etiology*; D010300:Parkinson Disease / Q000175:diagnosis*; D012008:Recurrence