Ovarian cysts presenting with stomach pain are caused by the following reasons: 1. This cyst is a chocolate cyst due to endometriosis, endometriosis itself causes pain in the lower abdomen clinically and can present symptoms of stomach pain, it is recommended that surgery be given in time for treatment. 2. The cyst is relatively large and forms a relatively large tension in the abdomen which can also lead to localized pain. 3. The cysts may become malignant, which may lead to stomach pain. When ovarian cysts are found, blood can be drawn to check three gynecological tumors, mainly to rule out the possibility of cancer, such as carcinoembryonic antigen or one of the carcinoma antigen is abnormally elevated, clinically it may be malignant. It is recommended that women should have timely medical checkups, and if pathological ovarian cysts are found, timely surgery is recommended for treatment.