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