Rhinitis occurs after cooling down and is mostly seen in allergic rhinitis as well as chronic rhinitis. Patients with allergic rhinitis who are allergic to cold air will experience sneezing, clear nasal discharge and nasal congestion when the air cools down. Patients with chronic rhinitis will experience nasal congestion, congestion of the nasal mucosa, enlarged turbinates, and increased nasal secretions as the temperature drops and the air becomes dry. Therefore, patients suffering from rhinitis as well as allergic rhinitis should pay attention to keep warm when the temperature drops, enhance physical fitness, strengthen exercise and increase resistance. At the same time, warm saline can be used to clean the nasal cavity, keep the nasal mucosa clean and moist, promote the recovery of the normal physiological function of the nasal mucosa, reduce nasal congestion, thus improving the symptoms of nasal congestion.