Pleural effusion occurs when fluid accumulates in the pleural space, the thin area surrounding the lungs. Small amounts of fluid may cause few symptoms, but larger effusions can compress the lungs and interfere with normal breathing. Some patients notice symptoms gradually, while others feel sudden chest heaviness or breathlessness.
The right treatment depends on both symptom severity and the underlying cause. Pulmonology care helps determine whether the fluid needs drainage, monitoring, or additional workup.