Wiping the ass with fresh blood without pain is considered to be possible internal hemorrhoids, colon cancer or rectal cancer. 1. Internal hemorrhoids: internal hemorrhoids are benign lesions occurring in the anorectum, the main manifestations are bleeding and prolapse, especially common intermittent bleeding after bowel movement, usually painless. It is usually diagnosed by anorectal examination, such as rectal palpation and anoscopy. 2. Colon cancer: Early stage is asymptomatic, with the development of disease, there may be changes in bowel habit and fecal character, such as blood in stool, diarrhea, constipation, etc. The diagnosis depends on colonoscopy. Its diagnosis depends on colonoscopy and pathological biopsy. 3. Rectal cancer: Early symptoms are not obvious, and there are symptoms only when the cancer is bleeding or affecting defecation, so that blood is the most common, followed by frequent stool and fine stool, etc. Rectal finger test can diagnose most of the cases. Rectal finger test can diagnose most of the rectal cancers. Patients who have fresh blood from wiping their buttocks may also have rectal polyps, rectal trauma, and coagulopathic disorders. Therefore, after discovering this symptom, one should consult the doctor in time, improve the examination to make a clear diagnosis, and then follow the doctor’s instructions to treat accordingly.