What conditions can cause pleural effusion in the first place?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Pleural effusion is the buildup of excess fluid in the pleural space, the thin area between your lungs and chest wall. Common causes include congestive heart failure, pneumonia, tuberculosis, cancer, pulmonary embolism, kidney or liver disease, and autoimmune disorders. Symptoms often include shortness of breath, chest pain, and a dry cough, though some cases have no symptoms at all.

Because pleural effusion can stem from many different underlying conditions—some mild, others serious—identifying the likely cause early is critical. A free, instant, online symptom check can help you understand what your symptoms may mean and guide your next steps, whether that's seeing a primary care doctor, a specialist, or seeking urgent care. It takes just a few minutes and could bring clarity to a confusing situation.

Reviewed for medical accuracy: 07/20/2026

Important Next Steps

Discover causes of pleural effusion symptoms Learn if pleural effusion needs urgent care See whether symptoms suggest pleural effusion Find OTC options for pleural effusion discomfort Discover doctors for pleural effusion treatment Learn home remedies for pleural effusion symptoms Find if your symptoms suggest pleural effusion

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Explanation

Pleural effusion is when fluid collects in the space between the lungs and the chest wall. This can happen for several reasons.

Common Causes:

Heart Failure: The heart doesn't pump blood as well as it should, leading to fluid buildup.
Infections: Conditions like pneumonia can cause inflammation and fluid accumulation.
Cancer: Certain cancers can spread to the pleura, the lining around the lungs, causing fluid to gather.
Kidney or Liver Disease: These can lead to fluid retention in the body, including the chest area.

Less Common Causes:

Pulmonary Embolism: A blockage in the lung's blood vessels can cause fluid to leak into the pleural space.
Autoimmune Diseases: Conditions like lupus or rheumatoid arthritis can cause inflammation and fluid buildup.

Pleural effusion can make it hard to breathe and might need treatment to remove the fluid and address the underlying cause. If you're experiencing breathing difficulties or chest discomfort, you can use our free symptom checker to help identify potential causes and determine if you should seek medical care.

(References)

Jany B, & Welte T. (2019). Pleural Effusion in Adults-Etiology, Diagnosis, and Treatment. Deutsches Arzteblatt international, 31315808.
Valdés L, Alvarez D, Valle JM, Pose A, & San José E. (1996). The etiology of pleural effusions in an area with high .... Chest, 8549179.
Shen-Wagner J, Gamble C, & MacGilvray P. (2023). Pleural Effusion: Diagnostic Approach in Adults. American family physician, 37983698.

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