<unk>  is the most common form of parkinsonism and is sometimes called "idiopathic parkinsonism", meaning parkinsonism with no identifiable cause. It is sometimes referred to as a type of neurodegenerative disease called synucleinopathy due to an abnormal accumulation of the protein alpha-synuclein in the brain. The synucleinopathy classification distinguishes it from neurodegenerative diseases such as Alzheimer's disease where the brain accumulates a different protein known as the tau protein. Considerable clinical and pathological overlap exists between tauopathies and synucleinopathies, but differences exist. In contrast to<unk> , people with Alzheimer's most commonly experience memory loss. The cardinal signs of<unk>  (slowness, tremor, stiffness, and postural instability) are not normal features of Alzheimer's. Attempts to classify<unk>  into different subtypes have been made, with focus put on age at onset, progression of symptoms and dominance of tremor, but none have been adopted.
Parkinson's disease
Dementia with Lewy bodies
Parkinsonism
Antipsychotic
Parkinson-plus syndrome
Essential tremor
Alzheimer's disease
Progressive supranuclear palsy