Once you eat breakfast, diarrhea is usually related to physiological factors, irritable bowel syndrome, chronic enteritis and other factors, as follows. 1. Physiological factors: eating at 5-7 o’clock in the morning is prone to gastrointestinal tract peristalsis performance, easy to diarrhea after eating, increased stool frequency, but no functional lesions. 2. Irritable bowel syndrome: mainly due to mental, environmental, dietary stimulation, easy to cause gastrointestinal hyperfunction, after eating will suddenly cause diarrhea, abdominal pain. 3. Chronic enteritis: when the intestinal mucosa is repeatedly stimulated, it is easy to aggravate the symptoms after eating, thus causing abdominal pain, diarrhea, and after the burden on the gastrointestinal tract is increased, it is easy to cause gastrointestinal flatulence, indigestion and other symptoms. As soon as you eat breakfast, you start to have diarrhea, in addition to the above factors, but also to consider the intestinal flora disorders, dysfunction caused by. It is recommended to observe for a period of time first, if the symptoms are more serious and last longer, and accompanied by acute abdominal pain, it is recommended to consult a doctor in time.