Ovarian cysts can exhibit certain symptoms if they become malignant. The primary symptom is pain in the lower abdomen. Generally, if the ovary undergoes a malignant transformation, the mass will grow larger and create a sensation of swelling and pain. Sometimes in the late stages of ovarian tumors, there can be pain throughout the abdomen, along with signs of cachexia, such as weight loss and decreased immunity after eating, which may suggest the possibility of cancer. In such cases, timely medical examinations are necessary. Typically, a pelvic and abdominal ultrasound can reveal the situation, along with blood tests including changes in certain common tumor markers. If the disease is malignant, the tumor markers in the blood will significantly increase.