The absence of menstruation and thinning of the uterine lining may be a normal phenomenon caused by menopause, or it may be caused by Schihan’s syndrome, or it may be caused by a previous abortion. 1. Physiological factors: After entering menopause, the level of sex hormones in the body gradually decreases due to the decline of ovarian function, so the symptoms of lack of menstruation and thinning of the uterine lining may occur, and the patient may suffer from hot flashes, headache, palpitation, insomnia and other symptoms. 2. Schihan’s syndrome: Schihan’s syndrome is a kind of endocrine disease with hypopituitarism, which can lead to hypopituitarism of the target organs, and hypopituitarism of the ovaries can lead to symptoms of no menstruation and thinning of the uterine lining, and the patients can also suffer from postpartum breastlessness, fear of coldness, fatigue, hypoglycemia, low blood pressure, and other symptoms. 3. Induced abortion: For patients who have had one or even more abortions, scraping will destroy the basal layer of the endometrium and lead to adhesions in the uterine cavity, so patients may have symptoms of no menstruation and thinning of the endometrium. After eliminating physiological factors, if the symptoms of absence of menstruation and thinning of the uterine lining persist, it is recommended to consult a doctor to identify the cause of the problem and ask the doctor to take care of it.