Bad stomach and diarrhea are usually caused by acute gastroenteritis, indigestion, and gastrointestinal disorders. The illness of acute gastroenteritis is related to factors such as cold in the abdomen, unclean diet, and overeating. During the onset of acute gastroenteritis, the symptoms of stomach discomfort are not only caused by excessive secretion of stomach acid, stomach spasm and contraction, and impaired gastric power, but also by excessive stomach acid entering the intestine, which can cause irritation to the intestinal wall and accompany the symptoms of diarrhea. In case of indigestion, prolonged retention of food in the stomach can lead to symptoms such as gastric distention and stomach pain. During the retention process, the food will ferment and spoil badly, and the food will enter the intestinal tract, which will violate the intestinal mucosa and cause diarrhea due to hyperactive intestinal motility. Gastrointestinal dysfunction mostly occurs in states of excessive emotional stress, excitement, depression, etc. Gastrointestinal dysfunction, during an attack, can cause stomach discomfort and diarrhea because of impaired gastrointestinal function.