Eating bananas stomach pain may be caused by allergies, banana temperature is too low, stomach diseases and other factors. 1. Allergy: Individuals have different physiques, allergies or hypersensitivity to bananas. Allergic reaction usually manifests as stomach pain, abdominal pain, diarrhea and other symptoms. 2. Banana temperature is too low: If the temperature of banana just taken out from the refrigerator is low, it will cause stimulation to the gastric mucosa, and the stomach wall will have spasm contraction when it is cooled, so it will cause pain. 3. Gastric diseases: if the gastric mucosa itself has ulcers and erosion, eating bananas will stimulate the stomach to secrete gastric acid, which will further aggravate the erosion of the gastric mucosa, and thus stomach pain will occur. It is recommended to go to the hospital for examination, the doctor will be based on clinical symptoms to give the appropriate diagnosis, clear causes and timely symptomatic treatment.