Bleeding from the anus after a bowel movement but not accompanied by anal pain is most likely caused by internal hemorrhoids, which are often caused by eating more spicy or fried food or drinking alcohol that causes the capillaries in the mucous membrane of the lower rectum to dilate. It may also be caused by constipation, which cuts the mucous membrane of the lower rectum and causes bleeding. At this time, you need to adjust your diet, avoid spicy and fried foods, and avoid drinking alcohol. You also need to take oral laxatives for laxation, for example, you can choose Chinese medicines, such as hempen pill, Sophora pill, etc. You also need to incorporate hemorrhoid cream or hemorrhoid suppositories inside the anus to stop the bleeding. Generally through the above conditioning as well as treatment, most of the symptoms of blood in the stool can be improved in about 3-5 days. If conservative treatment is not effective and blood in the stool still recurs, it is recommended to go to the hospital to see an anorectal surgeon for treatment.