Allergy may cause abnormal edema of the mucous membrane of the throat and other tissues, resulting in symptoms such as foreign body sensation. Severe edema may cause breathing difficulties and other discomforts, requiring timely intervention with medication. For allergic rhinitis, allergic asthma and other diseases, foreign body sensation in the throat may occur after contact with allergens, which may be accompanied by itching in the nose, throat and larynx, causing sneezing, runny nose and other symptoms. Severe allergic reactions may also lead to complications such as severe laryngeal edema, causing breathing difficulties. Pre-existing allergic diseases with the above symptoms are recommended to get away from the allergens immediately, and if the symptoms do not subside, seek medical attention immediately.