The clinical symptoms of small intestine lymphoma, also known as malignant lymphoma of small intestine, are as follows: 1. abdominal pain and abdominal distension, when the tumor causes small intestine obstruction, it will show the symptoms of intestinal obstruction, patients will have abdominal pain and abdominal distension, accompanied by nausea and vomiting. 2. abdominal mass, when the tumor is large enough, you can feel the mass in the patient’s abdomen, and there will be local pressure pain. 3. blood in the stool, when the tumor has local erosion and bleeding, it will lead to blood in the stool. 4. diarrhea, more than 75% of patients will have diarrhea. 5. Diarrhea, more than 75% of patients will have diarrhea. 5.Loss of weight, because the tumor is a high consumption disease, it will lead to weight loss. 6.Perforation and overlapping, when it leads to intestinal perforation, it will lead to symptoms of peritonitis.