CausesBy Mayo Clinic staff
The underlying causes of childhood asthma aren't fully understood. Developing an overly sensitive immune system generally plays a role. Some factors thought to be involved include:
- Inherited traits
- Some types of airway infections at a very young age
- Exposure to environmental factors, such as cigarette smoke or other air pollution
Increased immune system sensitivity causes the lungs and airways to swell and produce mucus when exposed to certain triggers. Reaction to a trigger may be delayed, making it more difficult to identify the trigger. These triggers vary from child to child and can include:
- Viral infections such as the common cold
- Exposure to air pollutants, such as tobacco smoke
- Allergies to dust mites, pet dander, pollen or mold
- Physical activity
- Weather changes or cold air
Sometimes, asthma symptoms occur with no apparent triggers.
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