Normal diarrhea during the day and diarrhea at night is related to diet, abdominal cold, and kidney Yang deficiency. Some people are afraid of hunger at night, so they will deliberately eat more food at dinner. Too much food is not very digestible, and it will also cause stimulation to the gastrointestinal tract, and intestinal peristalsis will accelerate, which will cause diarrhea. In addition, when diarrhea symptoms appear at night, the main consideration is that the human body’s abdominal mucosa is weak, not paying much attention to the abdomen’s cold and warmth, stimulated by the cold will induce intestinal peristalsis, so it will cause the symptoms of diarrhea. According to Chinese medicine, the kidney is the root of the innate nature, and all other organs of the body need to be warmed by the kidney yang. Due to the deficiency of kidney yang, it is not able to warm the spleen, which eventually leads to the deficiency of spleen yang in the human body and cannot control the intestines, so it will lead to diarrhea symptoms.