Share several cases of serious digestive tract problems in tumor patients: 1. In a tumor hospital in Jiangsu, he had severe diarrhea, about 40 times a day, severe malnutrition and general edema. After multiple consultations, including enteral nutrition and other programs, it still didn’t help, and then he was transferred to me without any help, and was given treatment for a few days, that is, it was reduced to 4-6 times a day, and finally the day was much better! 2, in a hospital because of gastric cancer for complex surgery (further reasons unknown), due to the complex esophageal intestinal anastomosis, more long segments can not work properly, intestinal mucosa atrophy, malnutrition, the need for more than 20 bottles of albumin infusion every month. Prompt daily intubation through an intranasal tube to give nutritional fluid, still continued to worsen. By the time I was found, he had only 12 g of albumin and was severely anemic. The patient originally wanted to be treated with fecal transplantation, but, after evaluation, fecal transplantation was not given. Only special medication was given, and 2 weeks after treatment, he went home and his albumin rose from 22g at discharge to 30g. Along with the science: in oncology patients, the intestinal status severely nourishes the effects of chemotherapy as well as immunotherapy, which has attracted the attention of leading medical practitioners worldwide. It has also been found that if antibiotics are used before chemotherapy and damage the intestinal flora, the chemotherapy effect is poor. The same is true for tumor immunotherapy, if the intestinal flora is not good, the efficacy is not good either. Readers with a knowledgeable background can refer to a paper just published in February 2014 by Nature Medicine, the world’s leading professional journal.