lung congestion

The accumulation of mucus in the lungs and lower breathing tubes (bronchi). It is usually accompanied by a wet, productive cough that brings up thick mucus.  Infection with a cold or flu virus is among the most common causes of chest congestion and happens when the infection progresses from the upper respiratory tract – your nasal passages, sinuses and throat–into the lower respiratory tract–your breathing tubes (bronchi) and lungs.