Whether a teratoma affects pregnancy depends on the size and nature of the teratoma; if the teratoma is large or malignant, it can have an effect on pregnancy. Teratomas are tumors of the ovarian germ cells. Teratomas are divided into mature teratomas and immature teratomas. Mature teratomas are often called benign teratomas and have hair, oil, etc. inside the tumor. The other type of immature teratoma, in which the tumor is mainly composed of nerve tissue, is malignant and has a high likelihood of recurrence and metastasis, which may have an impact on fertility. Most teratomas are benign tumors, and as long as the ovaries function normally and ovulate regularly, they generally do not affect fertility. If the teratoma grows to a certain extent, with pressure symptoms or the occurrence of ovarian torsion, causing ovarian necrosis, it will have a certain impact on the fertility of women. It is important to note that teratomas, once detected, should be treated in a timely manner to avoid the occurrence of comorbidities.