It may be abnormal for a woman to have an endometrial lining that is 30 millimeters thick. Under normal circumstances, a woman’s uterine lining is usually no thicker than 13 millimeters, as it will shed on its own with menstruation when it reaches 10-12 millimeters, and then start a new growth cycle again. Thickening of the female uterine lining is usually due to endocrine disorders, endometrial polyps and many other reasons. When the lining of the uterus is 30 millimeters thick, it may be due to overgrowth of the endometrium, atypical hyperplasia of the endometrium, or an early manifestation of endometrial cancer. Therefore, when endometrial thickness of 30 mm occurs, we should know the patient’s menstrual status, whether there is any irregular vaginal bleeding, and decide whether hysteroscopic exploration plus curettage is needed in the light of the patient’s condition. According to the pathology of scraping, we can find out the cause of endometrial thickening and rule out the possibility of precancerous endometrial lesions before deciding on the next treatment plan. When a woman finds out that her endometrial thickness reaches 30mm, she should pay attention to it and need to consult a doctor in time, the clinician will formulate the best treatment plan according to the different conditions of the patient, after the diagnostic scraping surgery, whether she needs to take medication or surgical treatment, it is necessary to listen to the doctor’s advice.