The uterus is too loose is not correct, it should be the cervix is too loose, the vagina is too loose. 1. The cervical opening is too loose: the cervical opening is too loose is generally due to cervical insufficiency, or mechanical damage caused by the cervix, the cervical opening is too loose easy to lead to pregnancy after miscarriage, premature labor, etc., the contraceptive ring is easy to fall off and so on. 2. Vagina is too loose: Vagina is too loose is generally due to multiple pregnancies, or postpartum vulvovaginal tear suture is bad. Or due to post-partum pelvic floor muscle relaxation did not recover well, heavy physical labor and other causes of vaginal laxity phenomenon. Whether the cervix is too loose, or the vagina is too loose, you need to go to the hospital in time to make a clear diagnosis, by the doctor according to the specific circumstances, to formulate individualized diagnosis and treatment plan, so as not to delay the condition.