Polycystic ovarian syndrome (PCOS) is a hormonal imbalance that can cause weight gain -- as well as ovarian cysts, excessive hair growth on the body, acne, and irregular or long periods. Many women are diagnosed when they have difficulty conceiving due to irregular ovulation.
The Treatment Although PCOS can't be cured, there are ways to treat the symptoms, says Nieca Goldberg, M.D., author of Dr. Nieca Goldberg's Complete Guide to Women's Health. This usually includes a diet and exercise regime to encourage weight loss, along with birth-control pills to regulate ovulation and shrink ovarian cysts. You may also be prescribed the diabetes drug Metformin to improve insulin sensitivity, which helps with weight loss, fertility, and cysts.