The uterine wall consists of the plasma layer, the myometrium and the endometrium. Normally, the uterine wall thickness should be 10 mm in non-pregnant women, and in pregnant women, the uterine wall thickness will gradually increase to 20-25 mm. In late pregnancy, the uterine wall thickness will gradually become thinner, with a uterine wall thickness of 10-15 mm, or even thinner. Abnormal thickening of the uterine wall is often associated with adenomyosis, as well as bacterial and mycoplasma infections. Adenomyosis means that the endometrium with growth function invades the myometrium and grows diffusely, which can cause abnormal thickening of the uterine wall. Myometritis can also be caused by bacterial and mycoplasma infections, which can lead to thickening of the uterine wall. If a woman experiences thickening of the uterine wall after childbirth, but does not experience discomfort, it may be due to hypertrophy of the fibers of the uterus during pregnancy and poor recovery after delivery, or due to residual embryonic tissue in the uterine cavity. If abnormal thinning of the uterine wall occurs, it is mostly directly related to the thinning of the endometrium, including disease factors such as endometrial polyps, endometrial hyperplasia, or even endometrial cancer, as well as having multiple abortions, damaging the endometrium through uterine operations, or having insufficient estrogen in the body, all of which can lead to thinning of the endometrium. If abnormal manifestations of uterine wall thickness are found during the examination, a clear diagnosis is needed before treatment.