Cough

Cough refers to the sudden contraction of the chest cavity, causing the lungs to violently release air, usually accompanied by sound, and recurring. Cough is a protective reflex action of the body. When foreign bodies, inflammation, secretions, or allergic factors stimulate the receptors in the mucosa of the respiratory tract, impulses pass through the afferent nerve fibers to the medullary cough center, causing a cough. The cough causes the high-pressure gas in the lungs to be ejected. With the rapid airflow, foreign bodies or secretions in the respiratory tract are expelled from the body. Cough is not a disease but a symptom. One of the main symptoms of respiratory diseases is cough, such as cough without sputum or sputum is rarely dry, common in the early stages of acute laryngitis and bronchitis; acute cough occurs more often in foreign bodies in the bronchi; chronic chronic cough, More common in chronic bronchitis, tuberculosis and so on. Although cough is a protective reflex action, it may also spread tracheal lesions to the adjacent small bronchi, exacerbating the condition. In addition, a prolonged and severe cough can affect rest, easily consume energy, and cause damage to the elastic tissue of the alveolar wall, which can induce emphysema. The vagus nerves in the internal organs such as the ear, meninges, heart, esophagus, and stomach are stimulated, and they can also enter the cough center and cause cough.

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