Ovarian teratoma is a relatively common type of ovarian cyst in women, which in general does not appear asymptomatic and is only discovered incidentally during physical examinations. Ovarian teratomas are divided into immature teratomas and mature teratomas according to their nature. Immature teratomas are malignant tumors and are more serious, but mature teratomas are benign tumors and therefore not serious. Whether an ovarian teratoma is serious or not cannot be generalized, but depends on the nature of the ovarian teratoma. Mature teratoma is a benign tumor, if the size of the tumor is less than three centimeters, it does not have a great impact on the woman’s body and fertility, so it does not need special treatment and treatment, as long as regular follow-up can be observed. However, immature teratoma is a malignant tumor, which has a higher degree of malignancy and needs to be removed by surgery in time after detection. After surgery, further chemotherapy or radiotherapy is needed to avoid recurrence of the tumor. There is no definite conclusion about what causes ovarian teratoma, but women should develop good habits in daily life, do not have multiple abortions or induced abortions, and do not engage in high-risk sexual behavior. If a woman is found to have an ovarian teratoma during a medical checkup, she should not be too nervous, as not all ovarian teratomas are very serious.