Teratoma is a relatively common ovarian tumor in women, and most of them are benign. It is not possible to generalize whether a teratoma affects fertility. A small, benign teratoma does not affect fertility, but a large teratoma that is determined to be malignant will definitely have an impact on fertility. Teratomas larger than three centimeters in size or with malignant lesions may prevent the normal functioning of sperm, eggs or fertilized eggs, and may affect the function of the ovaries, thus affecting a woman’s fertility. Malignant teratomas require surgery to remove the affected ovary and therefore can lead to permanent infertility after surgery. The treatment of teratoma is usually surgical. During pregnancy, the pelvic congestion may cause the teratoma to increase rapidly and may even cause malignant changes, so the teratoma needs to be removed before pregnancy, but if it is found after pregnancy, the surgery can be performed before the 24th week of pregnancy and the surgery itself will not affect the development of the fetus. The surgery itself does not affect the development of the fetus. Therefore, women should not worry too much after finding a teratoma, not all teratomas have an impact on the reproductive function, but if a large myoma is found, it is best to opt for surgery in time to remove it.