Blood in stool means bleeding from the stool, including what people often call “blood in stool”, “anal bleeding”, “pus and blood stool” and “black stool”. “It usually appears as blood in the stool, or completely blood in the stool, and is bright red, dark red or tar-like in color. It is usually seen in bleeding from the lower gastrointestinal tract, including bleeding from the colon area, rectal area, and anus, or from the upper gastrointestinal tract. Preliminary determination of disease by color of blood in stool Usually, we can use the simple color of blood in stool to initially determine the location of the lesion in the GI tract that is causing the blood. Blood in the stool – “bright red” 1. Bright red blood in the stool is mostly considered a benign lesion of the anal canal and rectum, usually due to hemorrhoids, anal fissures, proctitis, rectal prolapse, ulcerative colitis (rectal lesions), colorectal polyps, foreign bodies in the colorectum or anus, trauma, etc. 2.Stage I and II internal hemorrhoids bleeding in hemorrhoids often manifest as bright blood-colored bloody stool, painless blood in stool, which is manifested as fresh blood attached to the surface of stool, not mixed with feces, or dripping blood after stool, or bleeding from the anus when squatting. In severe stage II or stage III and above, it not only manifests as blood in stool, but also is accompanied by the presence of different degrees of swelling prolapse after stool. 3.Blood in stool caused by anal fissure is usually attached to the side of the stool surface, and some patients have blood dripping from the stool, or blood on the hand paper, mostly accompanied by anal tearing pain during defecation, which is “pain – intermittent – increased pain”, clinically known as This pain is “pain – intermittent – pain increased” performance, clinical medicine called “periodic pain”, generally induced by constipation, and mutual cause and effect, mutual influence. 4, proctitis, ulcerative colitis rectal lesions in patients with blood in the stool usually mostly manifest as unformed or shaped stool, blood attached to the surface of the stool, usually patients show irregularity in the stool, frequent bowel movements, the sense of urgency, you can do a colonoscopy to make a clear diagnosis. 5.Patients with rectal prolapse usually show repeated prolapse of rectal or even sigmoid mucosa, accompanied by bleeding in the stool, bright blood, and other symptoms such as anal dampness, itching, swelling and pain. 6.Blood in stool caused by colon polyps is mostly painless bleeding in stool, which is generally manifested as bleeding in stool, not mixed with feces, stopping after the end of defecation, the amount of bleeding varies, but if the location of colon polyps is higher, it can also be manifested as mixed with feces. 7.If the blood in stool is large and bright red, it is necessary to consider gastrointestinal bleeding, or large bleeding caused by rectal and anal canal trauma, etc. Blood in the stool – “mucus, pus and blood stool, dark red” This kind of blood in the stool is mostly manifested as bleeding stool and feces mixed with dark red color, or with mucus, or mucus pus and blood stool, more attention to colorectal inflammation or tumor lesions. Common diseases include inflammatory bowel disease, bacterial dysentery, amoebic enteritis, colon and rectal cancer, etc. The blood in the stool caused by ulcerative colitis generally manifests as chronic, recurrent abdominal pain, diarrhea mucus-purulent blood stool, requiring colonoscopy and retention of pathological specimens, etc. 1, bacterial dysentery patients manifest fever, abdominal pain diarrhea, mucus pus blood stool, urgency, stool culture can be clearly diagnosed, antibacterial drug treatment is effective. 2, amoebic enteritis patients with dark red jam-like stool, through the stool examination can be found amoebic trophozoites and encapsulation, colonoscopy and biopsy is conducive to a clear diagnosis. The blood in stool caused by rectal cancer is bright red or dark red, and the bleeding is usually not mixed with stool, but may be accompanied by mucus, and may be accompanied by changes in stool habit, thinning of stool, abnormal bowel movement, incomplete feeling of defecation, etc., with special bad odor. 4.Blood in stool of colon cancer patients is mostly bloody stool with pus or mucus, dark red, mixed with stool, accompanied by abdominal mass, abdominal pain, chronic progressive wasting and other symptoms. If there is a large amount of dark red blood clots in the stool without fecal inclusions, consider upper gastrointestinal hemorrhage as the cause. Blood in stool – “tar-like stool”, “shiny black” Some patients have dark black or brownish-black stool with a shiny surface, which is clinically known as tar-like stool. If the bleeding is slow and the amount is small, the stool will be dark black and tar-like. Blood in the stool, caused by dietary items? In clinical practice, we often meet some patients who visit the clinic for blood in stool, not because of digestive tract diseases, but because of the change in color of stool caused by the consumption of certain drugs, beverages, or foods. This “blood in stool” can be stopped by changing the diet. To sum up, blood in the stool is not terrible, we understand that we can initially determine their own condition through the above methods, of course, if you want to further clarify the diagnosis, you need to go to the local regular public hospital in a timely manner, after an objective assessment of the condition, to receive targeted treatment programs!