The causes of diarrhea after eating breakfast basically every day may include abdominal cold, gastrointestinal tract dysfunction, irritable bowel syndrome and so on. 1. Abdominal cold: may be due to the patient sleep at night, the quilt is not covered, the abdomen is cold, stimulate gastrointestinal peristalsis accelerated. This triggers the symptoms of diarrhea right after the patient consumes breakfast. 2. Gastrointestinal tract dysfunction: may be due to the patient’s breakfast consumption is some cold, spicy, irritating food, the gastrointestinal tract stimulation, which leads to gastrointestinal peristalsis accelerated, resulting in patients with diarrhea symptoms. 3. Irritable bowel syndrome: if the patient suffers from irritable bowel syndrome, due to the patient’s gastrointestinal reflexes are too sensitive, resulting in the patient eating breakfast, the gastrointestinal tract is stimulated, resulting in the symptoms of diarrhea. If the patient basically has diarrhea every day after eating breakfast, it is recommended to go to the hospital in time. Improve the relevant examination, clarify the cause of the disease, and follow the doctor’s instructions for treatment. At the same time, it is recommended that patients eat warm and easily digestible food to reduce the burden on the gastrointestinal tract.