A left ovarian cyst is a cystic mass on the left side of the ovary. Ovarian cysts are divided into physiological and pathological, pathological ovarian cysts are divided into benign and malignant, physiological ovarian cysts are also called luteal cysts, cysts will disappear after a menstrual period, ovarian cysts are divided into epithelial tumors, interstitial tumors of the sex cords. There are three major types of germ cell tumors: i. Benign ovarian cysts, which have a relatively long course, gradually increase in size, are mostly solitary, active, with a smooth surface and a liquid dark area on ultrasound, which may have an indirect light band and a relatively clear border. Second, malignant ovarian cysts, relatively short course, rapidly increasing, mostly bilateral, fixed solid or cystic solid, irregular surface, often with peritoneal fluid, ultrasonography as a nocturnal dark area with disorganized light masses, light dot masses, unclear borders, benign tumors chocolate cysts and inflammatory cysts are more common, chocolate cysts are formed by endometriosis to the ovary, patients have a history of dysmenorrhea, menstrual pain gradually worsens. Third, benign tumor, within 5 cm, blood test CA125, if the results are normal, you can review the ultrasound once in 3 months, you can also take oral Guizhi Fu Ling capsule 2-3 months to review the ultrasound, if the cyst shrinks can continue to take, no change in the cyst, no need to take. More than 5 cm is recommended for surgery. If it is a malignant tumor of the ovary, it should be operated immediately upon detection.