An ovarian cyst is a sac or pouch filled with fluid or other tissue that forms on the ovary. Ovarian cysts are quite common in women during their childbearing years. A woman can develop one cyst or many cysts. Ovarian cysts can vary in size. In most cases, cysts are harmless and go away on their own. In other cases, they may cause problems and need treatment.
There are different types of ovarian cysts. Most cysts are benign (not cancerous). Rarely, a few cysts may turn out to be malignant (cancerous).