Many people have had the symptom of blood in the stool, however, most people simply think that it is caused by fire, ordinary hemorrhoids, there is no need to go to the hospital, tolerate the past. In fact, not, many anal and intestinal diseases, such as anal fissure, anal fistula, rectal polyps and even anorectal tumors may cause the symptoms of blood in the stool. Serious anal and intestinal disease patients, in the early stage of the disease, there is a blood in the stool symptoms, simply because they do not pay attention to, not to the regular hospital for scientific examination, which led to the deterioration of the disease. Even some systemic diseases such as leukemia and kidney failure may cause blood in stool. The direct consequence of neglecting blood in stool is that many diseases lose the best time for treatment. According to the survey statistics, 100% of patients with serious anorectal diseases have blood in the stool, change in bowel habits, defecation, intestinal dysfunction and other uncomfortable symptoms quite a long time ago. However, 80% of the patients do not pay enough attention to it, let it develop, until the blood in the stool can not be controlled or when the pain is unbearable to go to the doctor, which not only misses the optimal treatment time, increasing the difficulty of treatment, the most important thing is that the patients themselves have to endure the psychological and physiological double pain. The most important thing is that the patient has to endure both psychological and physical pain. If you go to the doctor in time to find out the cause of the first blood in the stool and treat it in time, you will not only save money, but also win a healthy body. According to the color and characteristics of blood in stool, you can quickly understand your condition and choose the treatment effectively, but if you need to confirm the diagnosis, you should be subject to professional medical examination. The causes of blood in the stool are: 1, anal fissure: anal fissure is mostly caused by long-term constipation. Most of them bleed during defecation, mostly fresh blood, not much bleeding, sometimes you will find blood stained paper, or blood attached to the surface of feces. In addition to blood in the stool, the patient will be accompanied by severe pain in the anus at the same time. 2, hemorrhoids: hemorrhoids, especially the first and second stage of internal hemorrhoids in order to blood as the main symptom. Blood in the stool usually occurs during defecation, blood dripping during and after defecation or jet-like bleeding, blood and feces do not mix. The amount of bleeding varies from a few milliliters to tens of milliliters. Repeated bleeding can lead to severe anemia. Rectal cancer: Stool is often mixed with pus and blood, mucus or putrid secretion. Rectal cancer will make patients have frequent bowel movements, and in the late stage, it is accompanied by anorectal drop, stools will become thin, and constipation and diarrhea appear alternately. 4. Rectal and colon polyps: intermittent blood in stool or blood on the surface of stool, bright red blood, secondary inflammation and infection can be accompanied by a lot of mucus or mucus blood in stool, there can be anal swelling, constipation or increase in bowel movement, and there can be polyps prolapsing out of anus in the case of long tip or near-anal position. 5, ulcerative colitis, dysentery: bleeding mixed with mucus or pus and blood stools, accompanied by abdominal pain, fever, frequent stools. Lower gastrointestinal bleeding, systemic diseases such as leukemia, hemophilia, uremia, etc., can also lead to varying degrees of blood in the stool, need to make a specific examination to identify. Once you find the symptoms of blood in stool, you should promptly go to the anorectal specialist for examination and treatment, early detection and early treatment.