Diarrhoea refers to abnormal frequency and liquidity of fecal discharges. It is usually due to disorders of the spleen, stomach, large and small intestines. In light of the manifestations of the disease and the course, it is clinically divided into acute and chronic. The former is mostly caused by indigestion due to excessive eating or improper diet and attack of external cold dampness, leading to dysfunction in transmission of intestinal contents, or caused by invasion of damp heat in summer or autumn; the latter is caused by deficiency of the spleen and stomach, leading to failure in transportation and transformation.
Excessive intake of food, particularly greasy food, leading to impairment of the stomach and spleen in transportation and transformation, or eating of raw, cold, dirty food, injuring the spleen and stomach, all bring about diarrhoea. Diarrhoea may also be caused by weakened function of the spleen and stomach due to irregular daily life or other factors. Since the spleen has the function in transformation and transportation, diarrhoea may occur if this function is affected.