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The word Asthma comes from the Greek word for panting.  It is a condition where there is chronic inflammation of the lungs in which the airways (bronchi) are reversibly narrowed. It affects nearly 300 million people worldwide. During an asthmatic attack , the smooth muscle cells in the bronchi constrict, and the airways become inflamed and swollen causing breathlessness. Asthma kills thousands of people in India alone every year.

The condition can be classified into four types: