The cause is unknown.
PCOS is a varied syndrome and shows up slightly differently in all of the women who suffer from it. Some may get ovarian cysts and some may not – most women may face weight gain and others may not. Most women have periods that are either far apart or close together. Some women get normal periods but their hormones show that they are affected by the disorder.
Generally, doctors still don’t know exactly why some women get PCOS, but studies have shown that it is in some part determined by your genes. There is no single gene that causes PCOS, but there are suggestions that a series of genes, especially those that affect hormone levels and insulin resistance, contribute to it. A wide variety of other factors such as stress and diet can also contribute.