Generally speaking, drinking red bean barley water does not cause diarrhea, because it is mainly through the diuretic to play a role, if there is diarrhea, more with the amount of excessive or their own spleen and stomach weakness, and not in the drainage. Red bean barley water is used red beans, Coix lacryma as the main raw materials made of tea, which red beans have the effect of diuretic swelling; and Coix lacryma has a water seepage dampness (to promote the operation of the water to dispel dampness), spleen and diarrhea effect, the two together, can be through diuretic to get rid of the body’s dampness, generally does not cause diarrhea. It is also important to note that the efficacy of herbal infusions is different from the efficacy of decoctions, the efficacy of the drug is limited, and it does not have a good therapeutic effect. For drinking red bean barley water after the occurrence of diarrhea, it is recommended to suspend drinking, or reduce the amount of drinking. If the diarrhea is more serious, it is recommended to consult a doctor in time to avoid delaying the condition.