We still do not completely understand many of the causes for asthma.  There are certain genetic factors, which contribute to the likelihood of people, suffering from asthma, such as if, hay fever or eczema runs in the family.  However, it is also a known fact that certain environmental factors play a large role in the risk of developing asthma.  High levels of pollution are also a well-known trigger for asthma. 

  A recent study carried out by the University of Southern California have also discovered that exercising in areas where there is a high ozone concentration in the air, leaves children three times more susceptible to developing an asthmatic condition.

  Research has also shown that asthma has become more and more prevalent over the past few decades.  This could be due to the increased pollution levels in past years.  Several epidemiological studies which have been carried out show conclusive evidence that inhaling pollutants can potentially lead to asthma in people who had no predisposition to the disease.

  Smokers are also more likely to develop asthmatic conditions earlier than their non-smoking counterparts.

  It has also been noted that people from disadvantaged social groups may be more likely to develop asthma, the reasons for this are still largely unknown.


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