It is easy to cough when it is cold.

Could be atrophic rhinitis. When the nasal mucosa atrophies, the cold air passing through the nasal cavity can not be sufficiently humidified and heated, which is easy to irritate the throat and cause cough. When breathing through the mouth, the gas is heated and humidified, which has little irritation to the throat, so it is relatively difficult to cough. It is recommended to go to the otolaryngology department of a regular hospital for diagnosis and treatment.