Thin uterine wall generally refers to the thin lining of the uterus, which can affect fertility. Patients are advised to visit the Obstetrics and Gynecology Department in a timely manner to clarify the cause of the disease and take appropriate treatment measures. The thickness of normal endometrium usually changes cyclically under the effect of estrogen and progesterone. The thickness of the endometrium in the proliferative phase is usually around 3-8mm, and the thickness of the endometrium in the secretory phase is usually around 8-10mm. Causes of endometrial thinning include endometrial injury, endometrial disease, and multiple purges and abortions. Thin endometrium can also cause changes in menstruation, such as decreased menstrual flow and amenorrhea due to uterine adhesions. In addition, it can affect the implantation of a fertilized egg and can interfere with the normal process of conception. Even if a normal pregnancy ensues, it is prone to miscarriage. If the patient with thin lining gradually returns to normal menstruation through clinical treatment, the impact on fertility is less. If the patient’s menstrual flow remains low and does not improve after symptomatic treatment, infertility may result.