The primary symptoms of intestinal rejection usually include abdominal pain, diarrhea, nausea, vomiting, and fatigue, which need to be treated as soon as they are detected. After a bone marrow transplant or liver transplant, the patient’s body will treat the transplanted part as a foreign body, which will lead to rejection reaction, and intestinal rejection is one of the more frequent and dangerous complications. Intestinal rejection can be divided into three levels, and the primary symptoms can be manifested as abdominal pain, diarrhea, nausea, vomiting, etc., and the patient will have fatigue. When intestinal rejection reaction occurs, must not be taken lightly, in addition to timely medical treatment, but also need to pay attention to nutritional supplementation, if necessary, can choose to infuse nutrient solution.