Wheezing is a high pitched whistling sound appeared when you breathe through the air passages obstructed. You will hear this sound most clearly while exhaling, but in severe cases, it might be heard when you inhale. There are many reasons for wheezing, such as bronchitis, asthma, COPD (chronic obstructive pulmonary disease), bronchoconstriction, etc. Among all of them, wheeze is caused mostly...