The uterus is the place where the fetus is conceived and if there is a problem with its structure, it can prevent the fetus from growing and developing in the uterus. The most common clinical abnormality in the structure of the uterus is fibroids, which can lead to infertility. Fibroids, also known as fibroids, fibroids and smooth fibroids, are the most common benign pelvic fibroids in women. It is the most common benign pelvic tumor in women, mostly occurring in women between 30-50 years old, and according to statistics, about 20% of women over 30 years old suffer from uterine fibroids. According to its growth number, uterine fibroids are clinically divided into solitary uterine fibroids and multiple uterine fibroids; according to its growth site, it is mainly divided into interstitial fibroids (i.e. located in the myometrium of uterus), subplasma fibroids (protruding on the surface of uterus and covered by plasma membrane only) and submucosal fibroids (i.e. protruding in uterine cavity and covered by mucosa only). The formation and development of uterine fibroids are closely related to estrogen levels. The amount of estrogen receptors in fibroid tissue has been clinically found to be greater than in normal tissue without fibroids, while the central nervous system regulates hormone metabolism, which also has a pro-inflammatory effect on fibroids. In addition, some uterine fibroids have cytogenetic abnormalities. According to Chinese medicine, uterine fibroids are caused by internal injuries, dysfunction of internal organs and stagnation of qi and blood, and imbalance of qi and blood is the causative factor of uterine fibroids. Uterine fibroids are the most common benign tumors in women. Uterine fibroids are a relatively complex disease due to their different growth sites and sizes. It is difficult to unify treatment principles by description. The nature and size of fibroids need to be clarified to know whether treatment is needed and whether pregnancy is possible. Can uterine fibroids affect pregnancy? As we mentioned earlier, the uterus is the place where the fetus is conceived, and problems with its structure can prevent its growth and development in the uterus. About 5-10% of patients with fibroids have infertility complications, accounting for 1-2.4% of all infertility cases. This is mainly related to the site of growth of fibroids. It is generally believed that subplasmic fibroids have less impact on conception, but there is a risk that the growth will affect the smooth progress of delivery; submucosal fibroids that are located near the inner orifice of the fallopian tubes or in the upper part of the uterine cavity can affect the smooth passage of sperm, making it difficult for a fertilized egg to implant and develop; interstitial fibroids that grow between the muscular walls of the uterus can elongate or distort the space of the uterine cavity, making it difficult for sperm to implant. If a fibroid grows between the walls of the uterus, it will stretch or distort the space in the uterine cavity and the sperm will have a longer journey to the fallopian tubes. If the fibroids grow at the cervical os or at the junction of the uterine tubes, they can squeeze the fallopian tubes and prevent sperm from passing through. If the fibroids grow in the ligaments on both sides, they change the normal position of the fallopian tubes and ovaries, making it difficult for the fallopian tubes to pick up eggs, and sometimes even blocking the passage of the fallopian tubes, making it more difficult to conceive and often causing miscarriage or premature birth. Most women who have fibroids before pregnancy can go through the whole pregnancy smoothly, but the fibroids increase significantly with the weeks of pregnancy. In a few cases, the following conditions may occur: if the fibroids are large and increase significantly during pregnancy, there may be red degeneration, there may be vague abdominal pain (mostly seen when the diameter of the fibroids exceeds 3 cm), fever and other symptoms, and even miscarriage or premature delivery may occur; if the fibroids affect the shape of the uterus, abnormal fetal position may occur; if the fibroids are submucosal and the placenta is attached to the surface of the fibroids, premature abruption of the placenta may occur. More than 90% of the fibroids will shrink back to their pre-pregnancy state 3-6 months after giving birth.