Appendicitis surgery diarrhea can be caused by a number of circumstances, may be due to intestinal flora imbalance, or due to the recovery of gastrointestinal function in the period of diet too greasy caused. 1. Imbalance of intestinal flora: because after appendicitis surgery, some antibiotics will be used to prevent infection, these antibiotics are likely to eliminate some probiotics in the intestinal tract, resulting in an imbalance of intestinal flora, causing diarrhea. 2. Dietary factors: After appendicitis surgery, the gastrointestinal function has a certain period of recovery, during this period to eat too greasy food is likely to cause indigestion, resulting in diarrhea. Appendicitis surgery after the thinning of the stool is also seen in other reasons, you should consult a doctor in a timely manner, under the guidance of a professional doctor to standardize the treatment, do not blindly use medication, so as not to delay the condition.