Claim: Parkinson's disease causes tremors.
Evidence: Early in the disease , the most obvious are shaking , rigidity , slowness of movement , and difficulty with walking.
A tremor -LSB- ˈtrEm @r -RSB- is an involuntary , somewhat rhythmic , muscle contraction and relaxation involving oscillations or twitching movements of one or more body parts.
It is the most common of all involuntary movements and can affect the hands , arms , eyes , face , head , vocal folds , trunk , and legs.
Most tremors occur in the hands.