As Parkinson's progresses, the symptoms become increasingly hard to miss. Many people develop changes in their facial appearance and speech patterns. The face tends to have a fixed, vacant expression called the "Parkinson's mask." Loss of facial muscle movement restricts facial expressions, including smiling, frowning, and laughing. Similarly, weakened throat muscles cause the individual's speech to become low-toned, unclear, and sometimes slurred. Choking, coughing, and drooling may develop at advanced stages.
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