Monday, December 26, 2011

What Causes Asthma?

The exact cause of asthma is not known, but it is believed to be a combination of environmental and genetic factors. It isn’t contagious. Asthma symptoms can be triggered by many things. What causes symptoms in one person might not bother another at all. The following are some of the common triggers:

• Allergens
• Airborne irritants and pollutants
• Exercise
• Weather
• Respiratory tract infections

There are other things that can trigger symptoms, even laughing, crying, and yelling can sometimes cause the airways to tighten in sensitive lungs, triggering an asthma attack.

1 comment:

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