Many patients with Parkinson's disease will have tremor as a manifestation of their disease. The tremor or involuntary shaking in PD can be seen in the hands, arms, legs, jaw or face. Typically, it starts on one side of the body, and it is visible when the affected body part is at rest or not in motion. Tremors that are present only with movement of the limb are usually due to other conditions. While it is present in many patients, approximately 25% of people living with PD never develop a tremor. Hence, not everything that shakes is Parkinson's disease. A neurological evaluation would be able to distinguish between different types of tremor.