The causes of postpartum diarrhea are mainly the following: a. dietary factors, mainly due to improve maternal immunity and resistance, as well as to promote its recovery and lactation, thus eating more high-sugar, high-fat food, causing the gastrointestinal tract can not absorb digestion, the formation of diarrhea and diarrhea; b. acute gastroenteritis, such as postpartum pregnant women eat unclean and cold food, will cause the peristalsis of the gastrointestinal tract to increase, causing diarrhea and diarrhea. This can cause diarrhea and diarrhea; third, the maternal immunity decreases after delivery and the intestines are compressed by the fetus, resulting in edema of the intestines. Therefore, after delivery, it will lead to intestinal congestion and intestinal bacterial dysbiosis or ectopic, which will produce enteritis and cause diarrhea; fourth, if the mother previously combined with intestinal inflammatory diseases, such as ulcerative colitis, Crohn’s disease, intestinal polyps and intestinal tumors, etc., can also produce diarrhea.