Eating tomatoes stomach pain may be caused by acute gastroenteritis, food allergies, gastric ulcers and other causes. 1. Acute gastroenteritis: after eating spoiled tomatoes, there may be bacteria, viruses and other substances in the spoiled tomatoes, which will invade the gastrointestinal tract of the human body, leading to the symptoms of abdominal pain, which may also be accompanied by nausea, vomiting, diarrhea and other symptoms. 2. Food allergy: people who are allergic to tomatoes may experience abdominal pain, diarrhea, nausea and other gastrointestinal symptoms if they eat tomatoes, as well as hives, angioedema and other skin symptoms, and itchy nose, sneezing and other respiratory symptoms. 3. Gastric ulcer: patients with gastric ulcer may have abdominal pain, nausea, lack of appetite and other symptoms, and the pain is often half an hour to an hour after eating food. The appearance of eating tomatoes stomach pain can go to the hospital, ask the doctor to make a judgment.