Bright red blood in the stool and anal pain can be caused by anal fissure, internal hemorrhoids, anal fistula, etc. 1. Anal fissure: when defecating, there is cut-like pain and bright red blood. The pain is cyclical, that is, the pain is intense during defecation, the pain is relieved after defecation, and the pain reappears after a few minutes, which is caused by spasm of the internal sphincter muscle, intense and persistent until the sphincter muscle fatigue is relieved. 2. Internal hemorrhoids: long-term constipation, easy to cause hemorrhoidal swelling, stagnation, causing hemorrhoidal vein rupture, triggering the situation of blood in the stool. The blood in the stool is bright red and usually does not produce pain. However, when the internal hemorrhoids prolapse and retraction is not timely, the blood in the stool is bright red with anal pain symptoms. At this time, the diagnosis can be confirmed by anoscopy. 3. Anal fistula: after the anorectal abscess breaks down or cuts and drains pus, it is easy to lead to the formation of anal fistula. This results in pain with blood, hard lumps, fever and other symptoms. Diet, should avoid eating spicy and stimulating food, so as not to stimulate the lesion, not conducive to the recovery of the disease. At the same time, it is recommended to eat more fiber-rich food, which is conducive to maintaining smooth bowel movement. If the symptoms are particularly severe and have seriously affected daily life, it is recommended to go to the hospital as soon as possible for targeted treatment.