Things that may make you more likely to get ovarian cysts include:
Hormonal problems. Taking the fertility drug clomiphene (Clomid) to help you ovulate can increase your risk of cysts.
Pregnancy. The cyst that forms during ovulation may stay on your ovary after you get pregnant and throughout your pregnancy.
Endometriosis. Cells that usually line the inside of your uterus grow outside it. These wayward cells can attach to your ovary and cause a cyst to grow.
A severe pelvic infection. If this spreads to your ovaries, it can cause cysts there.
A previous ovarian cyst. If you’ve had at least one ovarian cyst before, you’re more likely to get others.