Dry nose can be related to external factors (dust, dry air, overheated air and chemical stimulation), disease factors (nasal diseases and other diseases), etc. It is recommended that people with the corresponding symptoms consult a doctor in a timely manner to determine whether there is a cause of the disease and then treat it in a timely manner. 1. External factors (1) Dust. When there is too much dust in the air, a large amount of dust can be inhaled into the nasal cavity and adhere to the nasal mucosa, leading to a decrease in nasal secretions and thus manifesting as a dry nose. (2) Dry air. Such as the fall and winter seasons, when the air is dry, long-term in such an environment can lead to the burden of the nasal cavity wetting increased, the lack of nasal secretion, resulting in a dry nose. (3) Air overheating. When the ambient temperature is too high, it may stimulate the nasal mucosa leading to a decrease in secretions, secretions evaporate too quickly, thus leading to dry nose. (4) Chemical substance stimulation. Such as inhalation of paint and other chemical substances, can lead to the reduction of nasal mucous membrane secretion, mucous membrane redness and swelling, thus leading to dry nose. 2. Disease factors (1) Nasal diseases. Such as dry rhinitis, acute rhinitis, atrophic rhinitis, etc., can be manifested as dry nose. (2) Other diseases. Such as upper respiratory tract infection, dry syndrome, vitamin B deficiency, etc., may also lead to dry nose. If the dryness of the nose is obvious and difficult to be relieved by improving the environment, it is recommended to actively consult the doctor and follow the doctor’s instructions for reasonable treatment.