CAP complications can range from moderate issues to severe clinical syndromes. Extensive lung inflammation can impair oxygenation and lead to respiratory failure. Pleural effusion and empyema occur when fluid or infection accumulates in the pleural space. Lung abscess, necrotizing pneumonia, and sepsis represent more serious complications. Underlying chronic diseases may also decompensate (COPD exacerbation, worsening heart failure). Complication risk increases with older age, immunosuppression, and delayed care. That is why early diagnosis, appropriate treatment, and rapid reassessment when improvement is not occurring are critical. The operational goal is stabilization before complications develop.