Is pleurisy dangerous if not treated?

Pleurisy itself is not always dangerous, but if left untreated, it can lead to complications such as pleural effusion, where fluid accumulates in the pleural space, or even pneumonia. These conditions can cause significant respiratory distress and other serious health issues. Additionally, the underlying cause of pleurisy, such as an infection or autoimmune disease, may worsen without treatment. Therefore, seeking medical attention is important for proper management and to mitigate potential risks.