Why Does Pleural Effusion Occur?

Pleural effusion involves fluid buildup located between the tissues lining the chest and lungs. The presence of this condition makes it appear as though there's water in the lungs. The tissues surrounding the lungs are known as pleura and are designed to regulate breathing, which is why pleural effusion can lead to numerous complications. The severity of this condition largely depends on what has caused the pleural effusion as well as whether or not the patient's breathing has been adversely affected.