There are two kinds of retroversion of uterus: retroversion and retroflexion. The so-called "uterine retroversion" means that the longitudinal axis of the uterus is unchanged, and the whole uterus is retroversion, which is easy to make the cervix upturned, making it difficult for the cervix to soak in the semen pool and affecting pregnancy, but not all posterior uterus will cause infertility. The uterus is generally asymptomatic after mild symptoms. In severe cases, it will cause pelvic congestion, menorrhagia, difficulty in menstrual discharge, excessive leucorrhea, abdominal pain, backache, anal distension and other symptoms. Some women even have sexual pain or discomfort. A person whose uterine body leans backward to the rectum is called posterior uterine position. Among them, the longitudinal axis of the uterus remains unchanged, and the whole uterus falls backwards, which is called uterine retroversion. If the uterus is backward and the junction between the uterus and the cervix is at an acute angle, it is said that the uterus is backward and backward. The former is more common and the latter is less common. The common causes are ligament relaxation, pelvic floor diaphragm and broad ligament bottom injury caused by multiple births. The cervix with the uterus backward is upturned, so the cervix is not easily soaked by semen. For women with posterior uterus, after ejaculation, a roommate, can put a pillow under her hip. Most women with uterine contraction have symptoms of backache and abdominal pain, which often leads to uterine contraction related to sleeping position. Most women with posterior uterine position have symptoms of backache and abdominal pain, which often leads to the relationship between posterior uterine position and sleeping position. Women who sleep on their backs for a long time after abortion are also prone to posterior uterine position. The posterior uterus can cause many diseases, and once it happens, it is difficult to correct it, so it is very important to prevent the posterior uterus.