Silver Book Fact
Lightheadedness, drooling, and difficulty swallowing can occur because of autonomic nervous system dysfunction in Parkinson’s disease.
Simmons A, Tarsy D. Parkinson’s Disease in Later Life. Generations. 2006; 3: 57-63. http://www.ingentaconnect.com/contentone/asag/gen/2006/00000030/00000003/art00010