Bleeding stool is one of the common symptoms in anorectology. Hemorrhoids, colorectal cancer, anal fissure, rectal polyps, rectal cancer, lower gastrointestinal bleeding and other diseases may cause bleeding in the stool. Therefore, patients with blood in the stool must pay attention to this, as blood in the stool may indicate other diseases in the body. The GI tract below the ligament (including the jejunum and ileum, colon and rectum) is called the lower GI tract. Bleeding caused by lesions in these areas is called hemorrhage in the stool, i.e. bleeding from the lower gastrointestinal tract, which is manifested by blood being discharged from the anus, or blood being discharged together with feces, and the color of blood is mostly bright red or dark red. If the lesion is in the jejunum, ileum, or right hemicolectum, and the bleeding volume is small and the bleeding rate is slow, black stool (tarry stool) may be excreted. In addition, when the upper gastrointestinal lesions bleeding, such as bleeding volume, speed, blood in the intestinal cavity for a short period of time, can also be manifested as the anal discharge of dark red, or even bright red blood stool, this situation is also easy to confuse with the lower gastrointestinal lesions bleeding, the above two cases must be distinguished. A, what causes fresh blood in the stool 1, hemorrhoids: stool with blood generally occurs in the process of defecation or after the stool, dripping blood or jet, blood is bright red, blood and feces do not mix. The hemorrhoids cause bleeding in the stool, with hemorrhoids to solve the stool when fresh blood often mixed with feces, sometimes accompanied by the nucleus of the hemorrhoid prolapse, the formation of edema, embedded when pain can occur, serious patients with hemorrhoids can lead to anemia. 2, anal fissures: anal fissures lead to blood in the stool, blood is bright red, dripping out or hand paper wiped with blood, and there is severe anal pain after the stool. 3, rectal and colon polyps: blood is bright red, painless, and blood does not mix with stool. Rectal polyps and sigmoid polyps cause stool bleeding. There is bright blood or dark red blood stained outside the stool after the stool, and rectal polyps are occasionally accompanied by polyp prolapse. 4, ulcerative colitis: bleeding mixed with mucus or pus-blood stool, accompanied by abdominal pain, fever, frequent stools, etc. 5, rectal cancer: blood is bright red or dark red, attached to the surface of the stool in the form of drops; late stage often appears pus and blood stool and accompanied by anorectal drop, wasting, stool habit changes and other symptoms. Colorectal malignancy, rectal malignancy caused by stool bleeding. Expression for the solution of mucus pus and blood stool or dark red blood stool, late malignant swelling of the stool has a foul odor. 6, bacteriophageal dysentery: the cause of blood in the stool is less, often mixed with feces, pus and blood or pus and blood mucus-like stool, bright red, frequent stools, with a sense of urgency and pressure pain in the left lower abdomen, accompanied by abdominal pain, diarrhea and nausea, vomiting. 7, rectal polyps: blood in the stool or bleeding after defecation, generally not much blood in the stool, not mixed with the stool, blood attached to the surface of the stool, bright red. Chronic cases can be mixed with mucus or pus. Sometimes the stool becomes thin in the form of thin strips. In some irregular small clinics, due to the lack of equipment and many causes of blood in stool, misdiagnosis and mistreatment often occur, especially for early internal hemorrhoids and early rectal cancer, the symptoms are slightly painful blood in stool, so the misdiagnosis rate is high; according to statistics, more than 80% of rectal cancer patients have been misdiagnosed as internal hemorrhoids in the early stage, so they miss the better treatment time for nothing. Therefore, the precise examination of blood in the stool is of great significance. If you find yourself suffering from some symptoms of anorectal diseases, you must go to a professional anorectal specialist hospital for examination and treatment in time. The danger of blood in the stool Blood in the stool easily makes the body lose a lot of iron, causing iron deficiency anemia. The development is generally slow, and there can be no symptoms or mild symptoms in the early stage, but when the anemia is heavy, there will be pale face, tiredness, loss of appetite, palpitations, accelerated heart rate and shortness of breath after physical activity, swelling, etc. Some patients may even have neurological symptoms such as agitation, excitement, irritability, etc. At the same time, blood in stool is also an early sign of intestinal malignant tumor. Since the situation of blood in stool is similar to hemorrhoid bleeding, it is difficult for general people to distinguish it, and some people do not pay enough attention to it, so it is easy for early malignant tumor to be easily ignored and lead to tragedy.