What are the beginning stages of parkinson's disease?

Tremor: Early, there may be a resting tremor unilaterally, and perhaps some focal stiffness. Later, the gait may become impaired, with short unsteady steps, and a tendency to fall. The face may become expressionless, drooling may present, and thinking becomes disrupted. Problems with swallowing, constipation, and skin eruptions can also occur.