Asthma is a common chronic inflammatory disease of the airways characterized by variable and recurring symptoms, reversible airflow obstruction and bronchospasm accompanying wheezing, coughing, chest tightness, and shortness of breath. When you come into contact with something that irritates your lungs, known as a trigger (see below), your airways become narrow, the muscles around them tighten and there is an increase in the production of sticky mucus (phlegm).
A severe onset of symptoms is known as an asthma attack or an 'acute asthma exacerbation'. Asthma attacks may require hospital treatment and can sometimes be life-threatening, although this is rare.
For some people with chronic (long-lasting) asthma, long-term inflammation of the airways may lead to more permanent narrowing. If you are diagnosed with asthma as a child, the symptoms may disappear during your teenage years. However, asthma can return in adulthood. Moderate to severe childhood symptoms are more likely to persist or return later in life. Although asthma does not only start in young people and can develop at any age.
Causes of MPB:
The cause of asthma is not fully understood, although it is known to run in families. You are more likely to have asthma if one or both of your parents has the condition.
Common triggers: May vary from person to person.
A trigger is anything that irritates the airways and brings on the symptoms of asthma. These differ from person to person and people with asthma may have several triggers. Common triggers include house dust mites, animal fur, pollen, tobacco smoke, exercise, cold air and chest infections.
Note: We are giving only a brief description of each disease for your quick reference with some best related photographs where needed.