A member asked:

Why am i having a crackling sound in lungs when exhaling?

A doctor has provided 1 answer

Bronchitis?: One explanation for crackling and wheezing sounds on exhalation is inflammation / infection of the breathing tubes (bronchi). This is called bronchitis. Pneumonia and partial occlusion of bronchi (by mucus or a foreign body) are other things that can cause expiratory crackling. Some people with 'fluid in the lungs' or pulmonary edema may also have expiratory crackling sounds.

Answered 5/15/2019

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