What defines pleurisy?

Pleurisy is defined specifically by the inflammation of the pleura, which are the membranes surrounding the lungs. This inflammation can trigger sharp chest pain, especially during respiration, coughing, or sneezing, as the inflamed layers rub against each other. The pain is often referred to as pleuritic pain and is a hallmark symptom of the condition.

The nature of pleurisy involves inflammatory processes rather than the presence of pus, fluid accumulation, or calcification. Options detailing conditions like pus accumulation or fluid increases are related to other pleural disorders, such as empyema or pleural effusion, respectively. Likewise, calcification leading to stiff lungs can occur due to chronic conditions but does not define pleurisy itself. Thus, the defining characteristic of pleurisy is indeed the inflammation resulting in acute and sharp chest pain.