Diarrhea after eating tomatoes may be related to gastrointestinal allergies, eating large quantities on an empty stomach, food poisoning, etc. If there is a gastrointestinal tract underlying disease, diarrhea can also occur due to food irritation. 1. Gastrointestinal allergy: If you are allergic to tomatoes, it is easy to have gastrointestinal allergic reaction after eating tomatoes, causing diarrhea symptoms. Tomatoes have been clearly identified as allergens of the population is prohibited. 2. fasting a lot of food: because tomatoes contain more phytic acid, fasting state too much to eat, easy to stimulate the gastrointestinal tract, intestinal peristalsis is too fast, it is easy to appear stool or even diarrhea symptoms. 3. Food poisoning: eating moldy tomatoes, may be due to bacterial or fungal infection caused by acute gastroenteritis, etc., at this time there will be abdominal pain, abdominal and other symptoms. 4. Gastrointestinal tract underlying diseases: suffering from irritable bowel syndrome, enteritis and other gastrointestinal tract underlying diseases, eating tomatoes can trigger the onset of disease, abdominal pain, diarrhea symptoms. If the diarrhea symptoms continue to be unrelieved, it is recommended to consult a doctor in a timely manner, under the guidance of a professional physician to clarify the cause of the disease, and follow the doctor’s instructions for treatment. At the same time, pay attention to abdominal warmth, do not eat cold, cold food.