There are many reasons for coughing when you get cold, which may be caused by chronic airway diseases or cough variant asthma. 1. Chronic airway diseases: Commonly found in chronic bronchitis and so on. Due to the airways or mucosa for a long time there is chronic non-specific inflammation, resulting in the local defense and immune function of the respiratory tract is weakened, easily affected by external factors. Symptoms such as cough and phlegm appear when cold or inhaling cold air. 2. Cough variant asthma: Due to allergies, the respiratory tract is usually in a highly reactive state, and when cold air is inhaled, irritating cough symptoms may occur. Cold on the cough may also be the cause of other respiratory diseases, it is recommended to go to the hospital in a timely manner to check, identify the cause of the disease, and follow the doctor’s instructions for treatment.