| Neurodegenerative causes |
| Alzheimer disease |
| Corticobasal degeneration |
| Dementia with Lewy bodies |
| Frontotemporal dementia |
| Huntington disease |
| Multiple system atrophy |
| Parkinsonism-dementia-ALS complex of Guam |
| Progressive supranuclear palsy |
| Spinocerebellar ataxias |
| Symptomatic |
| Drug-induced (antipsychotic drugs, other dopamine receptor antagonists) |
| Infectious (post-encephalitic, Creutzfeldt-Jakob disease) |
| Metabolic disorders (hypoparathyroidism, pseudohypoparathyroidism, chronic liver failure, extrapontine myelinolysis, end-stage kidney disease, type 2 diabetes) |
| Neurogenetic (Wilson disease, neurodegeneration with brain iron accumulation, neuroacanthocytosis) |
| Neoplastic |
| Post-traumatic |
| Toxic (carbon monoxide, manganese, MPTP) |
| Vascular |
| Other |
| Essential tremor |
| Normal pressure hydrocephalus |
| SWEDD (Scans Without Evidence of Dopaminergic Deficit): patients with relatively isolated upper extremity tremor resembling early Parkinson disease who lack evidence of nigrostriatal dopamine deficiency on dopamine transporter imaging |
