Ovarian cysts are solid or fluid-filled pockets in or on your ovary. They’re common, especially in women who are pregnant or who haven’t gone through menopause yet. Most of the time, they’re painless and harmless. You might get one every month as part of your menstrual cycle and never know it. They usually go away on their own without treatment.
A cyst becomes a problem when it doesn’t go away or gets bigger. It can become painful. There’s also the possibility of cancer, but it’s rare. The chances go up as you get older