Drooling in Parkinson’s, also known as sialorrhea, occurs primarily due to difficulties with swallowing from muscle rigidity and bradykinesia (slowness of movement). Parkinson’s affects the muscles involved in swallowing, reducing the frequency and efficiency of this automatic action. As a result, saliva tends to pool in the mouth instead of being swallowed regularly. While the amount of saliva produced is typically normal, the lessened ability to manage it leads to excessive drooling. Consult with a speech pathologist or dental specialist for treatment options.