Blood in the stool from the anus, whether the stool is bloody or all bloody, bright red, dark red or tarry in color, is called blood in the stool. Blood in the stool mostly indicates bleeding in the lower gastrointestinal tract, especially in the colon and rectum. Blood in the stool with vomiting is a manifestation of upper gastrointestinal bleeding, the color of the stool depends on the location of the bleeding, the amount of bleeding and the time spent in the intestine, upper gastrointestinal bleeding is mostly black stool, if the amount of bleeding and fast discharge, it can also be dark red or even bright red. 1, jam-like stool: is a mixture of blood and mucus like mucus jelly stool, such as children aged 6-24 months, accompanied by paroxysmal crying, to consider intussusception. 2, bright red blood stool: fresh blood attached to the surface of the stool. If the child cries a lot when relieving stool, consider anal fissure; if there is no crying, consider rectal polyps. If the baby also has eczema, intermittent vomiting, etc. to consider the presence of protein allergies. 3, adzuki bean soup-like stool: stool is bloody water-like, fishy, in consideration of hemorrhagic necrotizing small intestinal infections, children often have abdominal pain, abdominal distension is obvious. 4, pus and blood stool: stool with snot-like mucus and pus and blood, accompanied by fever, abdominal pain, shortness of breath symptoms in children, there may be bacterial dysentery. 5, tarry stools: the bleeding is higher, consider stomach and small intestine bleeding, such as gastric ulcer, gastritis, etc. Pediatric nosebleeds and gum bleeding after swallowing blood into the esophagus, can also discharge black stools such as tar-like. 6, dark red blood stool: indicates that most of the bleeding site in the small intestine and colon, stool and blood mixed, if painless stool and a large amount, consider Meckel’s diverticulum; if the blood stool is small to consider tumors, intestinal tuberculosis and other diseases.