Allergic rhinitis nasal congestion in children can be quickly relieved by taking medications such as glucocorticoids, antihistamines, and decongestants, but under the guidance of a doctor. 1. Glucocorticosteroids: Glucocorticosteroids, such as trimethoprim acetate, can inhibit the immune response, thereby reducing inflammation and controlling allergic reactions. It can quickly and effectively relieve allergic rhinitis symptoms such as nasal congestion. 2. Antihistamines: Histamine is an important component of inflammatory substances in allergic rhinitis, and histamine can damage normal cells, thus causing inflammation. Therefore, antihistamines such as Diphenhydramine can be used to prevent the cells from being affected by histamine, thus further relieving the symptoms of allergic rhinitis nasal congestion quickly. 3. Decongestants: Decongestants such as hydroxymetazoline hydrochloride nasal drops can make the blood vessels of the nasal mucosa contract, thus reducing the swelling of the nasal mucosa, which can effectively and quickly relieve the symptoms of allergic rhinitis nasal congestion. When the child suffers from allergic rhinitis nasal congestion, it is recommended that parents take the child to the hospital in time for treatment, and strictly comply with the doctor’s instructions for medication.