What is blood in the stool? Blood in the stool is called blood in the stool when the stool is bright red, dark red or tar-like (black stool). Blood in the stool is only a symptom, not a disease. Blood in the stool is most often seen in lower GI bleeding, especially bleeding from colon and rectal lesions, but can also be seen in upper GI bleeding. The color of blood in the stool depends on the location of the bleeding, the amount of bleeding and the time the blood stays in the gastrointestinal tract. What kind of blood in stool should I go to the hospital? Once blood in the stool occurs, I suggest that you should go to the hospital promptly. Do not just diagnose yourself with “hemorrhoids”. 3. What to tell your doctor when you have blood in your stool As a patient, when you have blood in your stool, pay attention to the following conditions, which you need to tell your doctor when you go to the clinic. 1, pay attention to the characteristics of blood in the stool, understand the occurrence and development process of blood in the stool, each time it is necessary to observe their own stool. 2, distinguish the nature of blood in the stool, bleeding mode, color and bleeding volume. This will help the doctor to determine the direction of diagnosis and conduct purposeful auxiliary examinations. 3, pay attention to the accompanying symptoms of blood in the stool, such as pain, abdominal pain, anal pain, etc. 4, the common causes of blood in the stool 1, fresh blood stool common in hemorrhoids, intestinal polyps, rectal prolapse, anal fissure and other diseases 2, pus / mucus blood stool common in rectal cancer, colon cancer, ulcerative colitis, intestinal infectious diseases and other diseases 3, black stool also known as tarry stool, black or brown-black stool, is one of the most common symptoms of upper gastrointestinal bleeding. 4, occult blood stool small amount (trace) of gastrointestinal bleeding will not cause stool color change, only in the fecal occult blood test is positive, called occult blood stool. All diseases causing gastrointestinal bleeding can occur occult blood stool, commonly ulcers, inflammation and tumors. Regular fecal occult blood testing is an important way to screen for colorectal tumors (primary screening).