If left untreated, large or persistent cysts can lead to complications such as: - Ovarian torsion: The cyst causes the ovary to twist, cutting off its blood supply and leading to potentially severe pain and damage. - Rupture: A large cyst can burst, causing internal bleeding and severe pain. - Infertility: Conditions like endometriosis and PCOS, associated with ovarian cysts, can impact fertility. - Cancer: Though rare, some ovarian cysts can be malignant, making early diagnosis and treatment crucial.