According to the U.S. Department of Health & Human Services, no one knows the exact cause of PCOS. Women with PCOS frequently have a mother or sister with PCOS. But there is not yet enough evidence to say there is a genetic link to this disorder.
Many women with PCOS have a weight problem. So researchers are looking at the relationship between PCOS and the body’s ability to make insulin. Insulin is a hormone that regulates the change of sugar, starches, and other food into energy for the body’s use or for storage. Since some women with PCOS make too much insulin, it’s possible that the ovaries react by making too many male hormones, called androgens. This can lead to acne, excessive hair growth, weight gain, and ovulation problems.
According to the U.S. Department of Health & Human Services, an estimated five to 10 percent of women of childbearing age have PCOS.