Parkinson’s and Alzheimer’s diseases are the most common diseases which affect many people in the world. Approximately, 1 million people in the world suffer from Parkinson’s disease, a motor disorder characterized by difficulty in initiating movements and slowness of movement. Patients often have a masked facial expression, poor balance, and a flexed posture. Like Alzheimer’s disease, which is characterized by confusion, memory loss, and a variety of other symptoms, Parkinson’s disease is progressive, and the risk increases with age. The incidence of the Parkinson’s disease is about 1% at the age of 65, and about 5% at the age 85. Parkinson’s disease appears to result from a combination of environmental and genetic factors. Evidence for a genetic role includes the fact that some families with an increased incidence of Parkinson’s disease carry a mutated form of the gene for a protein which is important in normal brain function. The symptoms of Parkinson’s disease result from the death of neurons in the mid-brain. As a result, at present, there is no cure for Parkinson’s disease, although various treatments can help control the symptoms.