What is the cause of blood in the stool? There are many causes of blood in the stool, and they vary from one cause to another. Some blood in the stool is after the stool, some is blood in the stool and the stool does not mix, and some is blood in the stool, black stool, etc. So, what is the cause of blood in the stool? How to distinguish blood in stool caused by different diseases? Blood in the stool is the most common early symptom of internal hemorrhoids, so people always treat blood in the stool as an attack of hemorrhoids. Because of this misunderstanding, many people tend to use some suppositories for hemorrhoids on their own when they have blood in their stool, and their symptoms are most likely to improve. However, for middle-aged and elderly people, blood in the stool may be a danger signal of rectal cancer and must be alerted. What’s wrong with blood in stool? 1, hemorrhoids: hemorrhoids manifest in the anus after defecation , blood is bright red, not mixed with stool or stool appearance with blood, followed by dripping blood, or even see the shape , stop on its own after the stool. Internal hemorrhoids are generally intermittent, and dry stools, fatigue, alcohol consumption, and over-eating irritating foods are often the triggers. In a few patients, severe anemia can occur due to long-term recurrent hemorrhoids. Internal hemorrhoids are divided into four degrees, degree I: fresh blood in the stool, hemorrhoids do not come out, stop after the stool; degree II: fresh blood in the stool, with internal hemorrhoids prolapse, after the stool to return; degree III: reduced blood in the stool, exertion or intra-abdominal pressure internal hemorrhoids prolapse, need to return by hand; degree IV: internal hemorrhoids prolapse can not be returned. 2, rectal cancer: rectal cancer is manifested as: changes in bowel habits or stool properties, mostly manifested as increased number of stools, unformed or thin stools, blood in stools and . Sometimes constipation or diarrhea alternates with constipation, and the stool becomes thin. Pain in the lower and middle abdomen, varying in severity, mostly vague or distending. Pay attention to the presence of systemic symptoms such as blood craving, emaciation, weakness, edema, hypoproteinemia, etc. When tumor necrosis or secondary infection occurs, patients often have .