The early symptoms of ovarian cancer are not severe or common clinically. Some patients may experience abdominal distension and pain. Some may have menstrual irregularities, such as prolonged or shortened menstrual cycles, increased menstrual flow, or irregular bleeding outside of menstruation. Additionally, a small number of patients may experience pelvic pain due to local tumor compression caused by ovarian cancer. This pain occasionally radiates to the perineal area and is generally mild, rarely affecting the patient's quality of life. Furthermore, a minor proportion of ovarian cancer patients, particularly those with tumors having endocrine functions, may exhibit symptoms associated with paraneoplastic syndromes.