Parkinson’s is a distinct and separate neurodegenerative disease that occurs with increasing frequency with advancing age. It is characterized by muscle tremors and stiff muscles, especially for muscles of the face. These give the Parkinson’s patient a typical mask-like face. There is an interesting reciprocal relationship between Parkinson’s and Alzheimer’s disease, as follows: Late in Parkinson’s disease symptoms of dementia develop in perhaps fifteen percent of such patients.

Similarly, late in Alzheimer’s disease, Parkinsonian symptoms develop, again in perhaps fifteen percent of such patients. In addition, in a small number of individuals both diseases may occur simultaneously, which then worsen the overall disability experienced by the patient. In addition the progression of symptoms may be somewhat more rapid in patients who experience both diseases to their full extent.

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