<P> Parkinson 's disease ( PD ) is a long - term degenerative disorder of the central nervous system that mainly affects the motor system . The symptoms generally come on slowly over time . Early in the disease , the most obvious are shaking , rigidity , slowness of movement , and difficulty with walking . Thinking and behavioral problems may also occur . Dementia becomes common in the advanced stages of the disease . Depression and anxiety are also common occurring in more than a third of people with PD . Other symptoms include sensory , sleep , and emotional problems . The main motor symptoms are collectively called `` parkinsonism '' , or a `` parkinsonian syndrome '' . </P>
what are common early manifestations of parkinson 's disease
shaking rigidity slowness of movement difficulty with walking Thinking and behavioral problems