Endometriosis to the ovary will result in endometriotic cysts of the ovary, also called chocolate cysts. Endometriotic cysts of the ovary will gradually increase in size with each menstrual period and may rupture during strenuous exercise or sexual intercourse of the patient, causing acute abdominal symptoms and severe abdominal pain. The rupture of endometriotic cysts in the ovary and the outflow of cyst fluid can cause the implantation of endometriotic foci, which can result in endometriosis in the pelvis, peritoneum and other organs. Therefore, if a woman finds an endometriotic cyst in her ovary, she needs to have timely treatment. If the endometriotic cyst in the ovary is more than 5 cm, timely surgery is recommended to avoid rupture of the cyst causing implantation.