Parkinson’s disease (PD) is a slowly progressive neurodegenerative disease caused when a small group of brain cells that control body movements die. This disease was first described by a British Physician James Parkinson in 1817. The disease occurs in about 1% of the people over the age of 65 years.
The peak onset of the disease is in the sixth decade of the life. However young onset Parkinson’s disease is not uncommon. The estimated prevalence rate of PD is approximately 8-22/1000.