Ultrasound shows Hemorrhagic ovarian cyst (HOC), but also suffer from pelvic pain?

Over the past year I suffer from intermittent pelvic pain. I had a ultrasound quite some time ago that showed I have hemorrhagic cysts located on my ovaries. i have had these cysts throughout my adult life so that doesn’t worry me but the pelvic pain does. Please tell me what can be causing this pain I experience.

Age: 31
Medications : None