The exact cause of asthma is still unknown. Experts believe that the combination of certain factors (family genes and exposure to environmental factors) can interact to cause it to develop asthma and all symptoms, most often at an early age. These factors include:
An inherited tendency to develop allergies called atopy.
Parents with asthma
Certain respiratory infections during childhood
Contact with some airborne allergens or exposure to certain viral infections during childhood or infancy period where the immune system is still developing
If asthma has occurred in several family members, exposure to airborne allergens (dust, cockroaches and even a cat or dog hair) and irritants (cigarette smoke ) may make your airways more reactive to substances in the air you breathe.
One theory that investigators have been proposed as a cause of asthma is the “hygiene hypothesis.” They believe that our Western lifestyle – with great emphasis on hygiene and sanitation – has resulted in changes in our living conditions and a general propensity to infections early in life.
Many children no longer experience the same type of environmental exposures and infections experienced by children in the past. This affects how the immune system is developed today in infants, and could increase the risk of atopy or asthma. This is especially true for children who have close relatives with any of these conditions.
Asthma affects people of all ages, but is much more common than is present in infancy. Young children who have frequent episodes of respiratory infections , as well as other risk factors are more likely to develop asthma extends beyond 6 years of age. These risk factors include having had allergies, eczema (an allergic skin condition), or parents who have suffered from asthma.
Among children there are more boys than girls with asthma. But among adults, more women suffer from this disease than men. It is still unclear the role of gender or sex hormones on the causes of asthma . Some people develop asthma because of exposure to certain irritating chemicals or industrial waste substances in their workplaces. This is called occupational asthma.
Different factors may be more likely to be causes of asthma in some people than others. But still carried out background research to explore the causes of asthma in a more concrete.
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