The symptoms of eating pineapple mouth pain, commonly caused by acidic substance stimulation, allergies, mouth ulcers and so on. 1. Acid stimulation: pineapple, the most common fruit in life, is rich in nutrients, such as pineapple prion enzyme, pineapple protease, etc. These nutrients can play a role in promoting digestion, improve blood circulation, etc., pineapple protease will also be stimulated by the human body’s oral mucosa, and part of the population may also have a sense of paralysis of the mouth and tongue, so it will be a pain in the mouth phenomenon. 2. Allergy: pineapple in the pineapple prion enzyme also has a high allergenicity, if the patient is due to eat pineapple after an allergic reaction, will lead to diarrhea, abdominal pain, dizziness, numbness of the mouth and tongue and other discomforts, some patients will eat pineapple mouth tingling situation. 3. Mouth ulcers: If the patient has mouth ulcers, the mucous membrane in the mouth is ulcerated, eating pineapple may cause great stimulation to the ulcerated mucous membrane, leading to the occurrence of eating pineapple mouth tingling.