The diarrhea may be caused by improper diet, gastrointestinal dysfunction, gastroenteritis, chronic cholecystitis and gallbladder stones, etc. The cause needs to be clarified and treated symptomatically. 1, improper diet: for example, lactose intolerance, after eating milk, coffee, lemonade may be due to the lack of digestive lactase in the body, and thus the phenomenon of diarrhea. Some people drink coffee for breakfast, which stimulates gastrointestinal motility and increases water in the intestines, which in turn leads to diarrhea after eating breakfast. In this case, attention should be paid to changing dietary habits, avoid eating foods that are likely to cause lactose intolerance, serious diarrhea should pay attention to rehydration, promptly go to the hospital, under the guidance of the doctor oral montelukast for treatment; 2, gastrointestinal disorders: irregular diet, disease and mental factors can lead to gastrointestinal disorders, which can lead to diarrhea after eating breakfast. Oral domperidone, omeprazole and other drugs can be taken under the guidance of a doctor for treatment; 3, gastroenteritis: bacteria multiply in the intestine and produce a lot of toxins, further stimulating the intestinal mucosa to secrete a lot of intestinal fluid, while stimulating intestinal peristalsis to accelerate, producing a lot of gas or due to unclean diet, resulting in possible diarrhea symptoms after breakfast. Treatment can choose to take oral probiotics, such as Bifidobacterium trisporus, Clostridium typhimurium, and if necessary, oral antimicrobials under the guidance of a doctor for treatment; 4, chronic cholecystitis and gallbladder stones: after eating breakfast due to poor bile secretion, or lack of bile digestion, resulting in food quickly into the intestines, causing increased water in the intestines, diarrhea. For patients with mild symptoms that do not affect normal life, non-surgical treatment, low-fat diet, long-term oral cholestatic drugs, such as anti-inflammatory and cholestatic tablets, ursolic capsules and cholestrol, etc., and symptomatic treatment with belladonna antispasmodic drugs for abdominal pain, and anti-infective treatment if necessary. For those with heavy symptoms or recurrent biliary colic with gallbladder stones, surgical treatment is an option.