20 things to k**w about asthma
 

http://img-s-msn-com.akamaized.net/t...6&q=60&o=f&l=fAsthma is a chronic pulmonary condition. There are more than 235 million people with asthma in the world, according to the World Health Organization (WHO). The Asthma Society of Canada explains that the disease is related to two factors: inflammation of the airways and bronchoconstriction (the twitching and tightening of the muscles surrounding the airways). When these muscles tighten, it leads to difficulty breathing and bouts of coughing. But what causes asthma? What are the symptoms? Read on to find out!

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