Although several genetic mutations have been identified to be associated with a higher risk of developing Parkinson's disease (PD) most people do not have these genetic variations.

On the other hand, even though pesticides and head traumas are associated with PD, most people do not have any obvious exposure to these environmental factors. Parkinson's is caused by a combination of genes, environmental and lifestyle influences. The interaction of all three components determines if someone will develop Parkinson's.