4-year-old child diarrhea with blood may be inflammatory bowel disease, bacterial dysentery and other causes. 1. Inflammatory bowel disease: 4-year-old child diarrhea is caused by ulcerative colitis, Crohn’s disease, inflammatory bowel disease diarrhea accompanied by blood in the stool, showing mucous pus and blood stools, but also in the defecation will be observed after bleeding phenomenon. 2. Bacterial dysentery: 4-year-old child body immunity is low, may be infected with dysentery bacillus, intestinal secretion of a large amount of liquid, more than the intestinal mucosa absorption capacity of diarrhea symptoms, diarrhea severe cause intestinal capillary rupture bleeding, there is diarrhea with blood. 4-year-old child diarrhea with blood may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.