If the tip of the tongue is tingling after eating pineapple, it is normal to return to normal within 30 minutes because pineapple contains two substances, one is called pineapple enzyme and the other is called alkaloid. Both pineapple enzymes and alkaloids break down proteins, so the tip of the tongue will feel tingly after eating. In addition, the alkaloids in pineapple cause the capillaries around the tongue to dilate rapidly, thus causing an increase in sensitization, and the tip of the tongue may feel tingly when sensitization increases. However, the above situation will return to normal in about 30 minutes. If the tongue continues to tingle, there will be abnormal conditions, such as pathological allergies or food poisoning from certain ingredients in the pineapple, which will also cause the tongue to tingle.