If diarrhea occurs continuously for a week, the following causes need to be considered: 1. If the food is infected by bacteria or if the food is out of date or spoiled, it may lead to abdominal pain and diarrhea from enteritis. 2. When the external environment changes, the body will also undergo a stressful reaction, for example, when the surrounding temperature decreases, the capillaries throughout the body will contract triggering intestinal ischemia, leading to pain accompanied by diarrhea. 3. The disease of persistent diarrhea is induced by intestinal polyps, intestinal tumors, ulcerative colitis, etc. It needs to be observed with the aid of colonoscopy to see what the specific disease is. 4, consider the imbalance of intestinal flora, when the intestinal flora is imbalanced, persistent diarrhea may occur if the proportion of Clostridium difficile in the intestinal flora is large.