The most likely cause of sudden anal bleeding but not painful is hemorrhoids. The symptom of early hemorrhoids is painless blood in the stool, and the color of the blood is bright red. If it is clear that it is hemorrhoids, you can first consider medication. The hemorrhoid medicine is divided into topical and oral medicine, topical medicine has three types: first, suppositories, suppositories can be inserted into the rectum through the anus, the main role is anti-inflammatory, hemostatic, promote the absorption of inflammation, mucosal healing. The second, topical lotion, hemorrhoids lotion is also a lot, divided into Chinese medicine preparations and Western medicine preparations, through the fumigation can promote hemorrhoids edema subside to relieve bleeding symptoms. Third, creams, creams are applied directly to the surface of the hemorrhoids to clear heat, dry dampness, invigorate blood, resolve blood stasis, stop bleeding and relieve pain, thus relieving symptoms. Oral medications are generally used to treat varicose veins, promote venous reflux to help repair the blood vessel walls, promote lymphatic return, and promote blood circulation for acute hemorrhoid attacks, including bleeding, swelling, itching, and anal dampness. Chinese medicine can sometimes work very well for bleeding hemorrhoids, the role of drugs is limited, if the conservative treatment of drugs does not work and bleeding recurs, go to the hospital as soon as possible to check and listen to the doctor’s opinion.