Cough and Expectoration
Cough is a human body’s defensive reflex action to clear respiratory secretions and foreign body. But persistent, frequent and severe cough interferes with work and rest, causes sore throat, hoarseness and respiratory muscle pain. Cough is also one of the most common symptoms of respiratory system diseases. A protracted severe cough may result in complications in those people who accompany underlying diseases, such as respiratory infections diffusion, bleeding, spontaneous pneumothorax, angina pectoris, cerebral hemorrhage, etc. Sputum is the trachea, bronchial secretions or exudate of the alveoli. The elimination of sputum from the lungs by coughing is called expectoration.