Parkinson’s disease is a neurological disorder that affects the body’s ability to control movement. It is caused by the degeneration of nerve cells in the brain, which can lead to tremors, slow movement, impaired balance and coordination, and difficulty speaking. General physicians may diagnose a patient with Parkinson’s disease based on physical symptoms such as these, medical history, and a blood test or an imaging exam. Treatment options include medication, lifestyle modifications such as physical therapy and speech therapy, and surgery if necessary.