Stomach pain when eating apples may be caused by psychological effects, stomach cramps, stomach ulcers and other factors. 1. Psychological effect: If you have had severe stomach pain after eating an apple, you may be afraid of eating apples. Under the influence of psychological effect, stomach pain may occur as soon as eating apples. 2. Stomach cramps: The temperature of apples is relatively low, if you eat apples too fast, your stomach may be stimulated by the cold, resulting in stomach cramps. Due to the spasmodic contraction of the stomach, stomach pain may occur as soon as you eat an apple. 3. Gastric ulcer: When apples enter the stomach, they can stimulate the wall cells to secrete hydrogen ions, thus increasing the acidity in the stomach. If you have a stomach ulcer, stomach acid is a kind of stimulation for the ulcer surface, under the action of stomach acid, it may cause stomach pain. Therefore, stomach pain when eating apples may be caused by stomach ulcers. If you have stomach pain when eating apples, you should consult a doctor in time, complete the psychological intelligence test, physical examination, gastroscopy and other tests under the guidance of the doctor to clarify the cause of the disease, and follow the doctor’s instructions for treatment.