Parkinson's disease is a condition in which an area of the brain becomes progressively damaged over several years. The main signs of Parkinson's disease are tremor, slow movement, stiff and inflexible muscles. There is currently no cure for Parkinson’s disease. However, treatments are available to help reduce symptoms and maintain quality of life for as long as possible. Parkinson's is a degenerative disease that destroys brain tissue and affects movement. It has four main symptoms: stiffness, shaking, slowness, and problems with coordination and balance. Other problems can also develop as the disease progresses, including fatigue, speech difficulties, disrupted sleep, memory problems, and depression. The disease is complex and diverse and arises differently in different people. However, there are some common features, the main one being the dead dopamine-producing cells in a brain area called the substantia nigra. Dopamine is a brain chemical that carries messages that control movement and other functions.