Ovarian cysts are a common gynecological condition that can occur in women between the ages of 20 and 50, mostly benign, but malignant lesions can also occur. If the cyst is malignant in nature, it will become ovarian cancer, and most of the cancer occurs after the age of 40. Whether an ovarian cyst is cancerous or not can be determined by symptoms and auxiliary examinations. The following symptoms can be seen in ovarian cyst cancer, as follows: 1) loss of appetite, abdominal distension and other gastrointestinal symptoms; 2) abdominal enlargement, abdominal pain and abdominal mass; 3) irregular vaginal bleeding; 4) wasting, anemia and other cachexia. If the above symptoms occur, then ovarian cysts have a higher chance of becoming cancerous, and the diagnosis should be confirmed according to auxiliary examinations, as follows: 1.Immunological examination: it is a more ideal method to detect tumor markers; 2.B ultrasound examination: it can clarify the size, shape, cystic solidity, location and relationship with surrounding organs; 3.Laparoscopy or dissection: it can observe the nature and scope of pelvic lesions under direct vision, and make biopsy. biopsy. The treatment methods for ovarian cyst cancer include: 1.Surgical treatment: it is the main treatment method, the scope of resection includes both ovaries, fallopian tubes, uterine omentum or abdominopelvic metastases; 2.Chemotherapy: commonly used drugs include cyclophosphamide, thiotepa, nitrogen mustard phenylpropionate, etc., which can be combined with multiple courses of chemotherapy; 3.Radiotherapy: for ovarian cancer patients who are sensitive to radiotherapy or cannot be removed surgically, it can be used as adjuvant or palliative treatment. 4.Immunotherapy: the purpose is to enhance the body’s immune function and specifically kill tumor cells, which has entered the clinical use stage. Post-operative care of ovarian cyst cancer should be strengthened as follows: 1. pay attention to personal hygiene to prevent wound infection; 2. maintain physical strength during treatment; 2. diet should be nutritious and avoid spicy and greasy food; 3. pay attention to keeping warm in life and exercise appropriately after recovery, etc. In order to detect ovarian cyst cancer at an early stage, the following points should be noted: 1. All solid ovarian masses, or cysts larger than 6 cm, should be surgically removed immediately; 2. Premenstrual and postmenopausal women with ovarian masses should be considered as tumors; 3. Pelvic tuberculosis or endometriotic masses should be surgically explored when treatment is ineffective and tumors cannot be excluded; 4. When pelvic surgery is performed, both ovaries should be carefully examined for lesions; 5. If endometrial adenoma-like hyperplasia or endometrial adenocarcinoma is found after menopause, attention should be paid to the presence of ovarian masses.