肠道肿瘤性慢性腹泻主要是由下消化道的各种良性及恶性肿瘤所引起的，不同部位和不同性质的肿瘤引起腹泻的临床特点和机制也不尽相同。１小肠肿瘤引起的腹泻 小肠几乎占消化道长度的７５％，但它却是人体内较少发生肿瘤的器官之一。可引起腹泻症状的小肠肿瘤主要有小肠恶性淋巴 Intestinal neoplastic chronic diarrhea is mainly caused by various benign and malignant tumors of the lower digestive tract. The clinical features and mechanisms of diarrhea caused by tumors of different sites and different natures are not the same. 1 Diarrhea caused by small intestine tumors The small intestine accounts for almost 75% of the length of the digestive tract, but it is one of the organs in the human body that have fewer tumors. The small intestine tumors that cause diarrhea are mainly malignant lymph of the small intestine.