What is wheezing?
Wheezing is the whistling or rattling sound that occurs when air flows through obstructed airways. At the start of an asthma attack, wheezing usually only occurs while exhaling, or breathing out, but as the attack progresses, wheezing may then be heard both while inhaling and exhaling. If after the attack progresses further, the asthmatic then stops wheezing, this may indicate that many bronchioles (small airways) have become completely blocked, which is a very serious condition.
