Four-year-old baby nose is always itchy, to consider with the nasal cavity is too dry, allergic rhinitis and other factors. 1. Nasal dryness: nasal dryness occurs in the fall and winter seasons, the fall and winter seasons are dry, easy to lead to dry nasal mucosa, once the nasal cavity is stimulated by the symptoms of dry itching. You can use a humidifier to relieve the dryness. 2. Allergic rhinitis: If the child has an allergic reaction to pollen, dust mites and other substances, it will easily lead to the occurrence of allergic rhinitis, which will lead to symptoms such as itchy nasal cavity, runny nose and sneezing. For allergy-induced itchy nose, anti-allergy medications such as loratadine need to be taken under doctor’s supervision for treatment. It is recommended that when the child occurs physical discomfort, parents should not blindly give the child medication, and actively take the child to the hospital for treatment, so as to avoid delaying the condition.