Diarrhea after eating fruit on an empty stomach may be caused by unclean diet, cold, allergies and other reasons. 1. Dietary impurity: fruit skin is not cleaned to eat, or a long time placed in the deterioration, decay, the patient served and diarrhea symptoms. 2. Cold: after the fruits placed in the refrigerator and taken out for direct consumption, the patient’s gastrointestinal tract is stimulated by the cold, which promotes the accelerated peristalsis of the gastrointestinal tract and diarrhea. 3. Allergy: patients may have allergic reactions to certain fruits and experience diarrhea. In addition, it will be accompanied by numbness of the lips and mouth, skin rash, redness and swelling and other symptoms. Diarrhea after eating fruit on an empty stomach may also be caused by other reasons, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor for targeted treatment.