The main clinical symptoms of allergic rhinitis are continuous sneezing, itchy nose and constant runny nose. Active application of vitamin C can enhance the body’s resistance and can counteract the symptoms of allergy in patients. Patients can consider taking oral vitamin C tablets or eating more fresh vegetables and fruits, such as pineapple, kiwi and passion fruit, which contain several times more vitamin C than normal fruits and can effectively play a role in replenishing the body with vitamin C. Patients with allergic rhinitis must exercise more to enhance resistance and avoid allergic reactions to allergens all the time.