Question: What are the symptoms of Parkinson's Disease ?
Answer: Parkinson's belongs to a group of neurological conditions called movement disorders. The four main symptoms of Parkinson's disease are: - tremor, or trembling in hands, arms, legs, jaw, or head - rigidity, or stiffness of the limbs and trunk - bradykinesia, or slowness of movement - postural instability, or impaired balance. tremor, or trembling in hands, arms, legs, jaw, or head rigidity, or stiffness of the limbs and trunk bradykinesia, or slowness of movement postural instability, or impaired balance. Other symptoms include depression, emotional changes, difficulty swallowing, speech changes, urinary problems, sleep problems, and dementia and other cognitive problems. Parkinson's symptoms usually begin gradually and get worse over time. As the symptoms become more severe, people with the disorder may have difficulty walking, talking, or completing other simple tasks. They also experience non-motor, or movement, symptoms including mental and behavioral changes, sleep problems, depression, memory difficulties, and fatigue. Parkinson's disease not only affects the brain, but the entire body. While the brain involvement is responsible for the core features, other affected locations contribute to the complicated picture of Parkinson's.
Source: NIHSeniorHealth

Question: What is (are) Parkinson's Disease ?
Answer: The main therapy for Parkinson's disease is the drug levodopa, also called L-dopa. It is a simple chemical found naturally in plants and animals. Nerve cells use levodopa to make dopamine to replenish the brain's supply. Levodopa helps to reduce tremors and other symptoms of Parkinson's disease during the early stages of the disease. It allows most people with Parkinson's to extend the period of time in which they can lead relatively normal, productive lives.
Source: NIHSeniorHealth

Question: what research (or clinical trials) is being done for Parkinson's Disease ?
Answer: Genetics is one of the most exciting areas of Parkinson's disease research. Studying the genes responsible for inherited cases can help researchers understand both inherited and sporadic cases of the disease. Sporadic means the disease occurs randomly and does not seem to run in families. Identifying gene defects can also help researchers - understand how the disease occurs - develop animal models that accurately mimic the death of nerve cells in human Parkinson's disease - identify new drug targets - improve diagnosis. understand how the disease occurs develop animal models that accurately mimic the death of nerve cells in human Parkinson's disease identify new drug targets improve diagnosis.
Source: NIHSeniorHealth