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The lungs are a pair of spongy, air-filled organs located on either side of the chest (thorax). The trachea (windpipe) conducts inhaled air into the lungs through its tubular branches, called bronchi. The bronchi then divide into smaller and smaller branches (bronchioles), finally becoming microscopic.
: Pneumonia is an infection in the lungs which can cause a chest pain either on the right or left side of the chest. Pneumonia can also lead to pleurisy, which is a viral infection which causes the inner lining of the lungs to swell.