The hazards of uterine fibroids are determined by the location and size of the fibroids, as well as the specific nature of the fibroids, which are broadly divided into the following aspects: 1. Subplasma uterine fibroids are prone to uterine fibroid torsion if they are relatively large in size. For non-pregnant women, the torsion is more obvious may cause acute abdominal pain and even surgical treatment. If the torsion occurs in women who are already pregnant, it may trigger uterine contraction or even miscarriage or preterm labor.2. Submucosal fibroids may affect the patient’s conception, or even early signs of miscarriage after conception, or even miscarriage or preterm labor.3. Affecting the amount of menstruation, for larger intermural fibroids and submucosal fibroids, it may lead to increased menstruation, prolonged menstruation period, or even intrauterine infection.4. The uterine fibroids may have some degeneration, but its malignant rate is relatively low, less than 1%, so this aspect is generally do not need to worry.