Diarrhea after drinking red bean and barley water is related to allergies, indigestion, weak spleen and stomach, etc. Under normal circumstances, drinking red bean and barley water will not cause diarrhea. However, some people belong to allergic body, will have allergic reaction to food, after eating food that will cause allergy, will lead to stress reaction in the gastrointestinal system, and therefore diarrhea symptoms. Although red bean and barley water is nutritious, but it should not be consumed in excess, too much consumption will lead to indigestion and therefore diarrhea symptoms. People with a weak spleen and stomach should not eat a lot of barley and red beans in general, barley and red beans are cold foods, people with a weak spleen and stomach will aggravate the symptoms after eating, but also because the burden on the digestive system is increased, so diarrhea occurs. Drinking red beans and barley water diarrhea people, in future life should try to avoid re-intake, at the same time should be timely use of probiotics, montelukast drugs to regulate.