What should I do if I often cough in cold air?

In your case, you should consider the possibility of variant asthma.

Guiding opinions:

Cough is the main manifestation of variant asthma patients, and external changes can also accelerate cough response. I suggest you go to the hospital to do a tracheal dilation experiment to determine whether it is variant asthma. If it is, you need to see a doctor. If you treat pharyngitis, anti-inflammatory drugs will not have much effect.