In Parkinson's disease, the tremor or shaking usually involves the arms and hands and is most prominent when the patient is at rest. In essential or familial tremor, the hands and arms are usually quiet at rest, but if the patient attempts to perform a task, such as picking up a glass of water or writing, then the tremor becomes very noticeable. Tremor can sometimes involve the head and neck and also sometimes involves the legs. Tremor interferes with many normal activities. Patients may be unable to write their name and, for instance, sign checks. They may be unable to drink from a cup or glass without spilling, and they may be unable to cut food with a knife and fork. In addition, patients may be unable to feed themselves, button clothing, comb their hair, or perform almost any movement that involves coordinated control of the hands, fingers and arms.

In Parkinson's disease, there are often other movement abnormalities in addition to tremor. These may include bradykinesia (slowness of movement) and rigidity or stiffness in the muscles, which make movements difficult. Also, in Parkinson's disease, there is frequently difficulty with walking because of the slowness and stiffness of movement and because of poor balance and a tendency to fall.

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http://www.parkinsondisease.in/