Whether a cough is contagious to the whole family depends mainly on the cause of the cough. If the cough is caused by an infectious disease, such as tuberculosis, it may occur when one person coughs and the whole family coughs. Conversely, if the cough is caused by a non-infectious disease, it will not occur. Coughing itself is a protective defense reflex that serves to clear foreign bodies from the airways. If the cough is caused by a non-disease factor such as exposure to a substance that irritates the throat, an adverse reaction to a medication, a puncture of the pleural cavity, eating too fast, or a non-infectious disease such as bronchial foreign body or gastroesophageal reflux, the cough will not be contagious to the whole family. If the disease that causes the cough is contagious, such as tuberculosis, influenza, etc., can be spread through the respiratory droplets of infection, there may be a person coughing at home, resulting in the whole family because of the infection and the onset of cough. If there is a frequent cough of unknown origin, it is recommended to consult a doctor in time and follow the doctor’s instructions for active treatment.