Answer: Parkinson's disease is a progressive nervous system disorder that affect body movement. Symptoms can be barely noticable at first, starting with a tremor in one hand that is barely felt. tremors are common but the disease can also cause stiffness and slowing of movement. Parkinsons disease can not be cured but can be helped with medications such as dopamine promoter, anti-tremor, cognition-enhancing medication, Anti-depression medicine, and physical excercise. Many other medications can be taken to help this disease.