Parkinson's Disease is a progressive neurological disorder that affects the brain and nervous system. The disease is characterized by tremors, stiffness of muscles, slow movement and speech.

Parkinson's disease is a chronic neurological disorder that causes shaking of limbs and body (tremors), slowness of movements (bradykinesia), rigidity of muscles and difficulty with walking. It is caused by death of dopamine-producing cells in the brain.

The symptoms are classified as primary or secondary. Primary symptoms are present from the beginning and cannot be explained by other diseases or conditions such as depression, drug abuse or medication side effects. Secondary symptoms develop later in the course of Parkinson's disease due to complications from other conditions or medications used to treat Parkinson's disease.