Symptoms of bright red blood after stool and anal pain are mainly seen in anal and intestinal diseases, such as hemorrhoids, anal fissure, perianal abscess and so on. 1. Hemorrhoids: blood in the stool is one of the typical symptoms of hemorrhoids, usually manifested as blood on the handkerchief or blood dripping in the stool, accompanied by perianal prolapse. When hemorrhoids are thrombosed, embedded or infected, anal pain may occur. 2. Anal fissure: anal fissure mainly occurs in the anal verge, anal canal and other parts of the feces when defecation through the fissure, skin tear bleeding, and produce tear-like pain. 3. Perianal abscess: Perianal abscess is formed by suppurative infection, there are small lumps in the perianal area, accompanied by severe pain. Perianal abscess usually does not bleed, but may produce bright red blood when the abscess breaks down. Bright red blood after stool, anal pain, in addition to the above diseases caused by, there may be other reasons, it is recommended to consult a doctor in time, detailed examination to clarify the cause of the disease, and give treatment as soon as possible.