Eating pineapple mouth pain is generally due to the pineapple contains bromelain enzyme decomposition of proteins, the oral mucosa to produce irritation, resulting in pain, as follows. Pineapple contains bromelain, a protein hydrolyzing enzyme. When pineapple is consumed, bromelain can destroy the structure of the oral mucosa, resulting in pain and, in severe cases, mucosal bleeding. In addition, bromelain may cause allergy, abdominal pain, nausea, vomiting, numbness of the lips and mouth, and in severe cases, respiratory distress and shock. As a fruit, pineapple has certain nutritional value and can be consumed in moderation, but it is not suitable for everyone, especially those who are prone to allergies. If the pain is severe and continues to be unrelieved, or other symptoms occur, it is recommended to go to the hospital in time to receive early treatment.