Why does your tongue get numb when you eat pineapple?

Eating pineapple tongue numbness, the reason is that pineapple contains pineapple enzyme, will cause stimulation to the tongue, the numb feeling.
Pineapple contains a stimulating effect of protein hydrolyzing enzyme known as bromelain. If pineapple is consumed directly, pineapple enzyme can stimulate the surface of the oral mucosa and tongue mucosa, resulting in a numbing sensation in the mouth and tongue.
Bromelain can cause an allergic reaction to pineapple, with symptoms such as numbness of the tongue, vomiting and diarrhea.
Before eating pineapple, you can cut pineapple into small pieces and soak them in salt water, which can reduce the activity of pineapple enzyme. If you experience numbness of the tongue after eating pineapple, you can gargle with lightly salted water or drink warm milk to neutralize the discomfort of the tongue.