Many different conditions can cause pleurisy and lead to pleural effusion. Viral infection is the most common cause. Other conditions that can cause pleurisy are:
Other causes of pleurisy include:
In some cases, doctors can't find the cause of the pleurisy. The most common cause of pleural effusion, or fluid in the pleural space, is congestive heart failure. Lung cancer, pneumonia, tuberculosis, and other lung infections also can cause swelling of the pleura and lead to a pleural effusion. Asbestosis, sarcoidosis, and reactions to some medicines also can lead to pleural swelling and pleural effusion.