Key highlights  1. Parkinson’s disease is caused by degeneration of dopamine-producing neurons. 2. Common muscular symptoms include resting tremors, bradykinesia (slowness of movement), muscle rigidity, and postural instability, impacting a person’s ability to move and perform daily activities. 3. Parkinson’s disease is typically diagnosed in mid to late adulthood, with an average age of onset around 60 years, although…