Blood in the stool is a clinical symptom of anorectal disease. Some people have the opposite attitude when they find blood in the stool and do not care, even delaying the disease. So once “blood in the stool” occurs, what exactly should we pay attention to? In fact, as long as you remember the following three words: “color”, “stool”, “pain”, you can complete the initial judgment of self-examination. First, color One of the most common questions doctors ask when patients visit them is “Is the bleeding color dark red or bright red?” The most common question is “Is the bleeding dark red or bright red?”. Usually, hemorrhoids, anal fissures and other common benign anorectal diseases, because of the location of the disease, usually present a bright red blood in the stool that does not mix with the stool, manifested in varying degrees of severity of blood stained stool paper, dripping blood or even spraying blood; while once there is dark red blood, mucus-purulent blood stool, blood mixed with the stool and other conditions, we should be alert to intestinal diseases, such as Crohn’s disease, irritable bowel syndrome and other inflammatory bowel disease or even digestive tract Tumor. Second, the stool There is no change in stool habits, stool characteristics. In layman’s terms, this means diarrhea, constipation, alternating constipation and diarrhea, and thinning of the stool. If there is blood in the stool along with diarrhea, we should consider excluding Crohn’s disease, ulcerative colitis, irritable bowel syndrome and other inflammatory bowel disease; if dark-colored blood in the stool along with persistent constipation or alternating constipation and diarrhea or even thin stools, we should be highly alert to intestinal tumors. Third, pain Are there any accompanying symptoms mainly abdominal pain or anal pain? What is the nature and duration of the pain? Mild hemorrhoids usually have no obvious pain, but if there are embedded hemorrhoids or thrombosed hemorrhoids that cannot be retracted outside the anus, there will be more serious swelling and pain in a short period of time, manifesting as swelling and bruising of the hemorrhoid nucleus outside the anus that cannot be touched, fear of defecation, preferring to stand and not to sit down, etc. If blood in the stool is accompanied by severe spasmodic pain in the anus after defecation, which can be relieved on its own after a period of time, you should consider whether there is a lesion of anal fissure; if abdominal pain occurs in case of cold, emotional tension, etc., and is rapidly relieved after defecation, you should consider irritable bowel syndrome; paroxysmal pain in the left lower abdomen is one of the common manifestations of ulcerative colitis; and patients with blood in the stool with vague pain in the lower abdomen and continuous loss of weight in a short period of time should be alerted to gastrointestinal tumors mainly colorectal cancer.