Pediatric blood in stool may be caused by upper gastrointestinal bleeding, lower gastrointestinal bleeding and systemic diseases.
1. Upper gastrointestinal bleeding: usually manifested as black stools, with fresh blood in the stool often occurs when the amount of upper gastrointestinal bleeding is large. Common pediatric diseases include peptic ulcer, acute gastric mucosal injury, cardia tear, vascular developmental abnormality and so on.
2. Lower gastrointestinal bleeding: mainly manifested as bright red stools, dark red stools and blood dripping after stool. Common diseases include intestinal polyps, colonic diverticulum, vascular malformation, intussusception, intestinal tuberculosis, dysentery, leukemia, ischemic bowel disease and infection-related colitis.
3. Systemic diseases: in addition to blood in stool, there are corresponding lesions in all parts of the body, such as systemic lupus erythematosus, hereditary hemorrhagic capillary dilatation, hemophilia, leukemia, primary thrombocytopenic purpura, epidemic hemorrhagic fever and so on.
If children are found to have blood in the stool aggravated by bright red stool, they should consult the doctor promptly.