Causes and Triggers
A trigger is anything that irritates the airways and causes the symptoms of asthma. Everyone's asthma is different and you may have several triggers. An important aspect of controlling your asthma is avoiding your triggers.
It may be impossible to avoid all of your triggers, but once you've identified them, there are things you can do to help you reduce unnecessary symptoms and better control your asthma.
It can be difficult to identify exactly what triggers your asthma. Sometimes the link is obvious, for example when your symptoms start within minutes of coming into contact with a cat or dog. But some people can have a delayed reaction to an asthma trigger, so some extra detective work may be needed.