Asthma is a common long-term condition that can cause coughing, wheezing, chest tightness and breathlessness. The severity of these symptoms varies from person to person. It can be controlled well in most people most of the time, although some people may have more persistent problems.
Occasionally, its symptoms can get gradually or suddenly worse. This is known as an “asthma attack”, although doctors sometimes use the term “exacerbation”. There is a decrease in the lumen of the air ways resulting from a twofold response to the allergens and other irritants.
Primarily in a hyper reactive response, the smooth muscles in the airways constrict and narrow excessively. Followed by an inflammatory response where the immune system responds to the allergens by sending white blood cells and other immune factors to the airways. These inflammatory factors cause a swelling of the airways and also an increase in the mucus secretion thus causing symptoms like wheezing, cough and shortness of breath.