Thin endometrium with low menstrual flow may be due to severe endocrine disorders, damage to the endometrium, malformation of uterine development and so on. 1. Severe endocrine disorders: the endometrium has a great relationship with the level of estrogen. If there are severe endocrine disorders, such as low levels of estrogen, etc., it will result in the endometrium not being able to grow normally and the symptoms of a thin endometrium and a low menstrual flow will appear. 2. Damaged uterine lining: Multiple medical or surgical abortions can cause damage to the uterine lining, which is one of the more common causes of damage to the uterine lining. In addition, uterine fibroids, endometrial polyps, scraping and other uterine operations can also damage the uterine lining, and endometrial damage takes a long time to recover, and some may not be able to return to normal. 3. Uterine dysplasia: If a woman’s uterus develops abnormally, or if she has an infantile uterus, it will also cause the symptoms of a thin uterine lining and low menstrual flow. Clinical endometrial thin menstrual flow will affect the normal pregnancy, it is recommended to go to the hospital for a detailed examination, to clarify the cause of the symptomatic treatment.