Ovarian Cyst

An ovarian cyst is a fluid-filled sac in or on a person’s ovary. The ovaries are part of the female reproductive system. They produce eggs and hormones.

Ovarian cysts are very common. They often occur during ovulation. This is when the ovary releases an egg each month. These are called functional cysts. Most are noncancerous. Many times, these cysts go away on their own without treatment.