Print
Email
Save
Definition
A cough is a forceful release of air from the lungs that can be heard. Coughing protects the respiratory system by clearing it of irritants and secretions.
Description
While people can generally cough voluntarily, a true cough is usually a reflex triggered when an irritant stimulates one or more of the cough receptors found at different points in the respiratory system. These receptors then send a message to the cough center in the brain, which in turn tells the body to cough. A cough begins with a deep
In normal situations, most people cough once or twice an hour during the day to clear the airway of irritants. However, when the level of irritants in the air is high or when the respiratory system becomes infected, coughing may become frequent and prolonged. It may interfere with exercise or sleep, and it may also cause distress if accompanied by dizziness, chest pain, or breathlessness. In the majority of cases, frequent coughing lasts one to two weeks and tapers off as the irritant or infection subsides. If a cough lasts more than three weeks it is considered a chronic cough, and physicians try to determine a cause beyond an acute infection or irritant.
Coughs are generally described as either dry or productive. A dry cough does not bring up a mixture of mucus, irritants, and other substances from the lungs (sputum), while a productive cough does. In the case of a bacterial infection, the sputum brought up in a productive cough may be greenish, gray, or brown. In the case of an allergy or viral infection it may be clear or white. In the most serious conditions, the sputum may contain blood.
Demographics
Formal statistics on coughs are not maintained. Virtually all persons will experience coughs several times each year throughout their lives.
 |
Author Info: L. Fleming Fallon Jr., MD, DrPH, Thomson Gale, Gale, Detroit, Gale Encyclopedia of Children's Health, 2006 |
Related Learning Centers |
 |
 |
 |
Advertise | Terms of Use | Privacy Policy