Asthma is a long term swelling of the lung airway that causes coughing, wheezing, chest tightness and shortness of breath.The asthma gets worse if it is around its trigger symptoms which are air pollution, tobacco smoke, factory fumes, infections, pollens, foods, cold air, exercise, chemicals and medication.In 2010, more than 18 million adults and 7 million children suffered from asthma.
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