Polycystic Ovarian Syndrome Causes
The cause is somewhat up for debate. While some studies have shown that there is a genetic component, and that certain manifestations of the syndrome are more present in certain ethnic groups, there has not yet been a gene or group of genes identified that cause PCOS.
There are also behavioral factors that can contribute to the development of PCOS, which overlap with causes for Metabolic Syndrome, or Syndrome X. These behaviors include sedentary lifestyle, over-consumption of refined sugar and "bad" fat (trans fats and refined oils stripped of any nutritional value), along with high stress levels. Check out the PCOS treatments section to see possible dietary changes that can be made and will likely help.
Additionally, the anti-seizure medicine valporate (brand name: Depakote) used to treat mania in adults (and sometimes children) can cause PCOS along with obesity and diabetes.