Whether or not a cough is contagious in the family depends on the specific circumstances, as follows: 1. It is contagious: There are clinical reasons why a cough may be contagious, such as if a family member has the flu, or has tuberculosis and other related diseases that can cause coughing symptoms, and these diseases may be contagious to others. 2. It is not contagious: Common bacterial bronchitis or bacterial pneumonia, for example, are generally not not be contagious. Sometimes cough can also be caused by non-infectious factors, including cough variant asthma and gastroesophageal reflux cough. Chronic bronchitis, bronchiectasis, lung cancer, interstitial lung disease and other diseases can also cause cough. If a family member has a cough caused by any of these reasons, contagion will not occur. To determine whether a family member’s cough is contagious, a visit to the respiratory medicine department should be made to clarify the specific cause.