Cyst is like bubbles in your ovaries. There can be many of it. And it will cause you to have irregular period of painful cramps. Doctors will give you hormone pills to get ride of the cysts. If cysts is tooooo big and doesn't go away, operation is needed. Every women will have cysts just few days before their period comes. It will usually be gone after period. Some stubborn ones will stay. That's when you accumulate many small cysts in you. Causes of it is hormone imbalance and it's a little harder to conceive.
I have this cysts problem when I was 18yrs old. Doc told me I will be having difficulty conceiving next time. Few months visiting this doc, no cure. So I went to my gynae for cysts treatment, pap smear. With medication given, da dah! I'm preg with my first son at 22 years old. Of cuz all cysts are cleared.