The dangers of untreated uterine diverticula are related to the size and severity of the diverticulum. Severe untreated uterine diverticula may have hazards such as prolonged menstrual periods, susceptibility to gynecological inflammation, placenta praevia after another pregnancy, and risk of uterine rupture in the second trimester of pregnancy. Uterine diverticulum is a depression that forms when the uterine incision site does not recover properly after a cesarean section. Every time you have your period, a little bit of menstrual blood will remain in the diverticulum, so your menstrual period will be prolonged, and prolonged bleeding will easily lead to bacterial infection and gynecological inflammation. As the uterine diverticulum is a scar that has not recovered completely, the elasticity is relatively poor, the placenta position is not easy to move upward in the middle and late stages of pregnancy and placenta praevia occurs, and the probability of bleeding during labor or cesarean section is relatively high, which is still relatively dangerous. If the fertilized egg is deposited in the diverticulum after pregnancy, the placenta is easy to implant in the myometrium, and the risk of uterine rupture increases with the increase of pregnancy weeks. Of course, some diverticula are so small that there is no serious harm if they are not treated, so you should pay attention to your personal hygiene and have regular checkups, and some of them will recover slowly, but if the diverticulum is too big, it is better to have it repaired to prevent the harm mentioned above.