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How do you catch asthma?

Cross section of a person, showing the the bronchial tubes in each lung.
Diagram of the bronchioles in the lungs.

Luckily, you can't catch asthma. People who have asthma just have very sensitive muscles around the bronchioles in their lungs. Contraction of these muscles can be set off by:

  • changes in weather (sharp cold, strong winds).
  • pollution.
  • excitement.
  • laughing a lot.
  • colds.
  • chest infections.
  • exercise.
  • being allergic to something like house dust, grass pollen or animal hairs.

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