Cough is a protective reflex of the human body. The early virus leads to the destruction of respiratory mucosa, the human body through cough, sputum discharge throat, and trachea, and bronchial secretions.

If there is a virus invasion or some pathogenic bacteria invasion, the airway mucosa will be invaded, appear in a reflex action, and want to remove the foreign body from the outside world.

The cough is divided into dry and wet cough. Virus infection usually shows no sputum at the beginning. With the progress of the course of the disease, some patients will also appear the symptoms of coughing up white and sticky sputum.

First often is a dry cough, which is no sputum secretion, just the airway responsiveness, as the disease progress, the airway will secrete some sputum, first may be white secretions, namely usually white sputum, with the progress of the course, airway mucosal damage, may on the basis of the virus secondary bacterial infection, then sputum color will appear, from white sputum into yellow sputum or yellow-green sputum, this time to consider the treatment of antibiotics, antibiotics generally oral, advice in 3-5 days this course of treatment is enough. If there are basic diseases such as COPD and bronchiectasis, the pathogen will be more severe, and these patients need to have to see if they need to go to the hospital according to their own respiratory conditions.

Cough is a protective mechanism of the human body, cough after infection many respiratory virus infections will appear, so once infected, or after infection, cough symptoms do not have to be too nervous.