After eating pineapple tongue pain is due to the pineapple in the protease on the tongue caused by stimulation, relieve the symptoms can be used to gargle with light salt water, eat pineapple before put in salt water soak. Pineapple is rich in fruit acids vitamin C, as well as pineapple protease, 5-hydroxytryptamine, these substances will cause stimulation of the oral mucosa and local skin, so after eating pineapple there will be a sore tongue, lips itchy and numb symptoms. Bromelain can be inactivated by heating or salt water, so to prevent tongue pain symptoms after eating pineapple, you can soak the pineapple in salt water or heat it in advance; to alleviate the symptoms of pineapple protease stimulation, you can gargle with light salt water after eating pineapple. If you are allergic, after eating pineapple, there is obvious redness, swelling and numbness of the lips, gargling with salt water can not be relieved, you need to consult a doctor in a timely manner.