There are many reasons for dry nose, such as common environmental factors, dry rhinitis, atrophic rhinitis and so on. 1. Environmental factors: especially in the fall and winter seasons, the weather is relatively dry, if a long time of inhalation of dry air, can lead to a decrease in nasal secretion, thus causing the phenomenon of nasal dryness; secondly, the patient’s long-term inhalation of paint and other substances can also cause the nasal mucous membrane redness and swelling, leading to a decrease in secretion, and cause nasal dryness. 2. Dry rhinitis: it is a kind of chronic rhinitis caused by the stimulation of external environmental factors, which is mainly manifested as dryness of the nose, reduction of nasal secretion, and viscous secretion on the surface of the nasal mucosa, etc. The main symptoms are dryness of the nose, reduction of nasal secretion, and mucous secretion on the surface of the nasal mucosa. 3. Atrophic rhinitis: atrophic rhinitis, also known as odorous nose, manifested as dryness and atrophy of nasal mucosa, increased nasal cavity, olfactory impairment, and a large number of yellowish-green pus crusts formed in the nasal cavity with foul odor. In addition atrophic rhinitis, upper respiratory tract infections, etc., can be caused by a dry nose, pay attention to the hospital in a timely manner, clear specific causes for standardized treatment.