If you experience numbness in your mouth after eating pineapple, drinking warm salty water or milk can relieve the symptoms. Numbness of the mouth after eating pineapple is due to the presence of bromelain in pineapple. Bromelain can degrade proteins, and direct contact with the mucous membrane of the lips can cause irritation, resulting in numbness of the mouth and tongue pain. If you have numbness and tongue pain after eating pineapple, you can drink warm salt water or milk to improve the situation. Salt water or milk can neutralize the activity of bromelain and reduce its stimulating effect. In order to prevent the symptoms of numbness after eating pineapple, you can soak the pineapple in light salt water for five minutes before eating. However, if the mouth is numb after eating pineapple, accompanied by obvious swelling, pain, fever, it is considered that there is an allergic reaction, you need to go to the hospital, oral loratadine or cetirizine and other anti-allergy drugs to improve the symptoms.