The blood in the stool is bright red and discharged with the stool, may be internal hemorrhoids, anal fissure, inflammatory bowel disease and so on. 1. internal hemorrhoids: internal hemorrhoids is mainly refers to the end of the rectum under the mucous membrane of the blood vessel plexus expansion varicose formation of soft mass, the main manifestation of this disease for the bleeding, blood is bright red, more with the stool together with the discharge, in severe cases can appear jet bleeding, mostly in a large number of drinking and eating spicy and stimulating food after the onset. 2. Anal fissure: patients with anal fissure can also have the symptom of bright red blood, but the main symptom of patients is anal pain, which is often aggravated after defecation, and can last for several minutes and some of them can last for several hours. 3. Inflammatory bowel disease: such as ulcerative colitis invasion of the sigmoid colon or rectum, this disease may appear in patients with blood in the stool, the blood can be bright red, can be mixed with pus, the patient can be accompanied by diarrhea, abdominal pain, weight loss and other symptoms. In addition, rectal trauma, mixed hemorrhoids, rectal cancer, rectal polyps and other diseases may also lead to bright red blood stools. When blood in the stool is bright red and is discharged together with the stool, the patient needs to be examined early to identify the cause, and then follow the doctor’s instructions for treatment.