J90: Pleural effusion, not elsewhere classified

The lungs are surrounded by a smooth membrane. A smooth membrane like this is also located inside the ribs. Both membranes cling to each other via a small amount of fluid. Through the suction of the fluid between the membranes, the lungs follow the movements of the chest while breathing. The lungs then alternately expand and contract. Air for breathing flows into the lungs and out again during these movements.

You have too much fluid between the two membranes that line your lungs. If there is too much fluid between these two membranes, the lungs may no longer be able to expand so well. You may thus get shortness of breath.

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