4. Unhealthy hygiene

athletic asthmatics Asthma is a modern disease that is the largest source of morbidity for children in the developed world, but happily can be overcome with appropriate attention.

inflammation and respiration Respiratory illnesses are an example of inflammatory diseases that result in part from inappropriate function of the immune system.

the hygiene hypothesis Part of the reason for the rising prevalence of asthma may be the great improvements in cleanliness and hygiene that characterize modern life.

asthma epidemiology However, hygiene is certainly not the whole story: Geography, socioeconomic status, and genetics all play their parts.

genetics of asthma Risk factors include immune regulators, genes involved in muscle function in the airways, and numerous others whose functions remain to be worked out.