Endometrial thickening or bleeding after diagnostic scraping may be due to short scraping time, infection, some cases need follow-up treatment but not treated and other reasons. 1. short scraping time: diagnostic scraping after a short period of time the endometrium has not been repaired, there is bleeding is normal, generally diagnostic scraping within two weeks after the blood stops, such as diagnostic scraping time is short can be temporarily observed, can also be assisted to take medication to stop bleeding. 2. Infection: after diagnostic scraping, if there is infection in the uterine cavity, it may lead to prolonged bleeding time, in addition to bleeding can also be accompanied by abdominal pain, fever, purulent discharge and other symptoms. 3. Need for follow-up treatment without treatment: endometrial abnormalities such as endometrial polyps, hyperplasia, pre-cancerous lesions or endometrial cancer require follow-up treatment. Diagnostic scraping is only the first step to make a clear diagnosis, and failure to follow up the treatment may lead to recurrence of bleeding. If the diagnosis is made within two weeks and there are no other abnormal symptoms such as abdominal pain, fever, purulent discharge, etc., the patient can be observed for a while. If bleeding still occurs even after the diagnosis has been made for a longer period of time or if abnormal bleeding occurs again after the bleeding stops, it is recommended to consult a doctor to find out the cause and give appropriate treatment under the doctor’s guidance.