There are various
mechanisms that cause asthma and vary among population groups
and even individuals. It is seen that many asthma sufferers also
have allergies. Not all people with allergies have asthma;
however, not all cases of asthma can be explained by allergic
Asthma is most
likely a result of genetic susceptibility, which probably
involves several genes and various environmental factors.
An asthma attack
can be induced by direct irritants (allergens or triggers) to the lungs such
Cigarette smoking can cause both
asthma and COPD.
Gastro esophageal reflux disease