Persistent cough

Cough is one of the most common symptoms in the respiratory system, and it is a protective measure for the human body. It is beneficial to the body. When the respiratory mucosa is stimulated by foreign bodies, inflammation, secretions or allergic factors, it is caused by reflection. Coughing helps to exclude foreign bodies or secretions that invade the respiratory tract from the outside, and eliminates respiratory irritants. Persistent cough is a precursor to lung disease. This cough will take two to three months to heal once it starts, and no cough medicine seems to do anything about it.