Bleeding from the toilet is bright red and painless, and whether it can heal on its own depends on the cause. This situation is common may be internal hemorrhoids, rectal polyps, colorectal cancer and other diseases. 1. Internal hemorrhoids: the main manifestation of internal hemorrhoids is blood in the stool and hemorrhoidal prolapse, and its blood in the stool is characterized by painless intermittent blood after the stool, or even jet-like bleeding. In most cases, without treatment, the hemorrhoidal surface edema may subside, bleeding stops, appear “self-cure” situation, but can not eradicate hemorrhoids, always have recurrence possible. 2. Rectal polyps: rectal polyp surface mucosa by dry hard stool scratch, can appear painless stool bright red blood. After the mucous membrane is damaged, it can heal by itself and the bleeding stops, but there is always the possibility of recurrence. 3. Colorectal cancer: If patients continue to have bowel habit, change of character and painless blood in stool, they often need to consider whether it is colorectal cancer, which cannot be cured by itself. Immediate consultation and comprehensive treatment is needed. The appearance of painless bright red blood stool may have other causes, such as abnormal coagulation function, etc., should go to the hospital in a timely manner, in order to clarify the diagnosis, and should not blindly wait for self-cure, in order to avoid delaying the condition.