A cyst is a small, fluid-filled sac that can develop on your ovary. Although ovarian cysts are usually harmless, you may require treatment if cysts are causing pain or other symptoms.
What Causes Ovarian Cysts
Ovarian cysts come in two different forms:
The most common type are functional ovarian cysts, which happen as part of the menstrual cycle as follicles prepare to release eggs for fertilisation. A follicle that doesn’t mature properly can swell and become a cyst. Functional cysts are usually harmless and disappear by themselves.
Pathological ovarian cysts happen when cells in the ovaries start to grow abnormally. Pathological cysts are rare, but there is a risk that they could become cancerous so they may need to be removed.