Parkinson's disease has a mix of genetic and environmental causes.
Parkinson's disease has a mix of genetic and environmental causes. However, it is only believe that approximately 10 to 15 percent of cases are genetic forms of the disease. Around 85 to 90 percent of the disease are sporadic cases. What researchers have learned about familial Parkinson's disease so far, is that having a first degree with Parkinson's does increase your risk. Some of the environmental factors that affect Parkinson's disease are age, gender, head injuries, geographic areas, occupations, and pesticide and herbicide exposure.