Pleural Effusion (Fluid in Chest): Symptoms, Causes and Treatment
Pleural effusion is an abnormal buildup of fluid in the pleural space, the thin space between the lung and the inner chest wall. It may occur due to conditions such as infection, tuberculosis, heart failure, kidney or liver disease, malignancy, or other inflammatory conditions. Depending on the amount of fluid and its cause, patients may experience breathlessness, chest pain, cough or fever.
Common Symptoms
The symptoms of a pleural effusion depend largely on how much fluid has accumulated and what is causing it. Some patients have no symptoms at all, while others experience
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This is the most common symptom, especially during physical activity or when lying flat.
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Often described as a sharp, stabbing pain (pleurisy) that gets worse when you cough or breathe deeply.
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full breath Problem
A feeling of tightness or restriction in the chest.​
What Causes Fluid to Build Up?
A pleural effusion is usually a sign of an underlying medical condition rather than a disease itself. Doctors categorize the fluid into two main types:
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Transudative (Clear Fluid): Usually caused by pressure imbalances or protein issues in the body. Common causes include Congestive Heart Failure (CHF), kidney disease, or liver cirrhosis.
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Exudative (Inflammatory Fluid): Caused by inflammation, infection, or injury to the lung. Common causes include Pneumonia, Cancer (Malignant Pleural Effusion), Pulmonary Embolism, or autoimmune diseases like Lupus.
Diagnosis and Testing
If your doctor suspects a pleural effusion, they will likely use one or more of the following tools:
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Imaging: A Chest X-ray is usually the first step, followed by an Ultrasound or CT Scan to see exactly how much fluid is present and where it is located.
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Thoracentesis: This is a common procedure where a doctor inserts a thin needle through the chest wall to remove a sample of the fluid. The fluid is then tested in a lab to determine the cause.
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Biopsy: In some cases, a small piece of the pleura (the lining) is removed for testing.
Treatment Options
The primary goal is to treat the underlying cause while removing the excess fluid to help you breathe easier.
1. Drainage Procedures
If the effusion is large, a doctor may perform a thoracentesis to drain the fluid. If the fluid keeps coming back, a small tube (chest tube) or a long-term PleurX catheter may be inserted to allow for ongoing drainage.
2. Pleurodesis
For patients with recurring effusions (often due to cancer), a procedure called pleurodesis may be performed. A medication is injected into the pleural space to "stick" the two layers of tissue together, preventing fluid from building up again.
Treating the Cause
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Diuretics: If the cause is heart or kidney failure.
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Antibiotics: If the cause is an infection like pneumonia.
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Chemotherapy/Radiation: If the cause is a malignancy.
When to Seek Medical Care
A pleural effusion can range from a minor issue to a life-threatening emergency. You should see a specialist immediately if:
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You experience sudden, severe shortness of breath.
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You have chest pain that radiates to your shoulder or back.
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You are coughing up blood.
Patient Tip
If you feel more short of breath when lying on your back, try propping yourself up with extra pillows. This can help the fluid settle at the bottom of the chest cavity and allow the upper parts of your lungs to expand more fully.
Research & Publications
Dr. Cladius has published research on Pleural Effusion
Int J Med Sci Public Health. 2016
Int J Med Sci Public Health. 2025
Journal of Datta Meghe Institute of Medical Sciences University, 2017
About the Service Provider
Dr. Smaran Cladius - MD Respiratory Medicine, Fellowship in Interventional Pulmonology, Certificate in Allergy Testing & Allergen Immunotherapy
Pulmonologist | Chest Physician | Allergy & Sleep Specialist
Dr. Smaran Cladius is a pulmonologist specializing in the diagnosis and management of respiratory diseases, including chronic cough, asthma, COPD, respiratory allergies, tuberculosis, interstitial lung diseases and sleep-related breathing disorders.
Medically reviewed and Last updated: July 2026
This information is for general educational purposes only and is not a substitute for professional medical advice. Read our full Medical Disclaimer →