Ovarian cancer refers to malignant tumors of the ovary. For primary ovarian malignant tumors, there are 4 stages, and those with stage II and above are called advanced stages. Ovarian malignant tumors are often asymptomatic in early stages and are only discovered by chance during gynecological examinations or ultrasound examinations for other reasons. Once symptoms appear, they are often manifested as rapid increase of ovarian mass within a short period of time, abdominal distension, abdominal masses and ascites. If the tumor infiltrates into the surrounding tissues or compresses the nerves, it may cause abdominal pain, lumbago or lower limb pain; if it compresses the pelvic veins, lower limb swelling may occur; if it is a functional tumor, it may produce symptoms of estrogen or androgen excess; with the development of the tumor, cachexia, severe anemia, weakness and other cachectic symptoms may occur. The severity of symptoms depends on the size and location of the tumor, the degree of invasion of adjacent organs, the histological type of the tumor, and the presence of complications. On examination, the tumor is often bilateral, fixed in position, solid or semi-solid and semi-capsular, with nodular uneven surface, often accompanied by ascites, mostly bloody, and cancer cells may be detected. Ultrasound examination shows disorganized light clusters and dots within the liquid dark area, and the mass is poorly defined. Because the symptoms of ovarian cancer are not very typical, especially in the early stage, most of the patients are already in advanced stage when they are found, so the prognosis is poor. Women should have regular gynecological checkups every year for early detection and early treatment.