Ovarian cancer is usually not misdiagnosed, but needs to be differentiated from endometriosis, tuberculous peritonitis, diseases outside the reproductive tract and benign ovarian diseases. 1. Endometriosis: endometriosis can also have adhesive masses and rectal uterine indentation nodules, which can be easily confused with ovarian cancer. However, endometriosis has symptoms such as progressive dysmenorrhea, and ultrasonography and laparoscopy can be used to assist in the differentiation of endometriosis. 2. Tuberculous peritonitis: it can be confused with ovarian cancer due to abdominal fluid accumulation and pelvic adhesive mass. However, tuberculous peritonitis often has the history of pulmonary tuberculosis, which can be identified by ultrasound and other imaging. If necessary, caesarean section and laparoscopic biopsy can be performed to confirm the diagnosis. 3. Tumors outside the reproductive tract: those that need to be differentiated from ovarian cancer include retroperitoneal tumors and sigmoid colon cancer. 4. Benign ovarian tumor: it can be identified through the course of disease, signs and general conditions. Ovarian cancer is usually not misdiagnosed. If you are worried about misdiagnosis, you can go to regular large hospitals again for further examination, such as ultrasonography, magnetic resonance imaging, serum CA125 and other tumor markers, laparoscopy and multi-point biopsy, etc. for comprehensive examination to confirm the diagnosis. If the possibility of ovarian cancer has been detected, patients are advised to seek medical treatment promptly.