The common causes of diarrhea watery stools are as follows: 1, viral infection is a common clinical cause, mostly caused by rotavirus infection. Chinese medicine believes that the infection is closely related to wind-cold, wind-heat, wind-damp and other external symptoms, usually occurring after a cold; 2, drugs: such as hypertensive patients taking olmesartan, telmisartan-type drugs are prone to watery stools; 3, neurological tumors; 4, spleen and stomach deficiency cold physique is more likely to occur diarrhea watery stools. Among them, drugs and tumor factors are not common in the clinic, only the patient’s medical history, clinical symptoms, medication history and other aspects of the analysis to find the cause of the disease, in order to better symptomatic and causal treatment.