Many people have allergy-induced asthma, which means that their asthma symptoms
are triggered by allergic reactions. These people have high levels of an allergy-causing
antibody (a type of immune protein in the body) called immunoglobulin E (IgE). When
they inhale something that they are allergic to, it attaches to the IgE, which then
starts a chain of events leading to symptoms of allergies and asthma.