Whether a cough is contagious or not depends on the cause. Coughs caused by respiratory diseases such as bronchitis and bronchiectasis are mostly not contagious; coughs caused by infectious and contagious diseases of the respiratory tract, such as influenza and open tuberculosis, may be contagious. Cough is a defensive reaction of the organism against external stimuli and is only a symptomatic manifestation. There are many causes of coughing. If the cough is caused by inhalation of cold air, it is not contagious. If the cough is caused by inhaling cold air, it is not contagious. If there are certain viruses or bacteria in the respiratory tract that can be spread by droplets, it is contagious. Therefore, it is advisable to go to the hospital promptly to check the symptoms of a cough, identify the cause and treat it accordingly. If the cough is caused by an infection, anti-inflammatory treatment is required. Patients with a weak constitution are more likely to have coughing symptoms after getting cold. However, when exercising, be careful not to get cold, and increase or decrease clothing according to the weather changes. Maintain good work and rest habits and moderate diet and exercise.