Asthma or infection: In asthma, bronchi or breathing tubes suddenly constrict in response to irritants, allergens and viral infections. This causes obstruction to airflow ; typically producing whistling sound or wheezing. It also causes chest tightness ; shortness of breath. Chest infection is a lay term loosely applied to pneumonia, bronchitis or a mere presence of "wet cough".
Answered 12/8/2013
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