Empyema also known as pyothorax,pleural empyema and purulent pleuritis.
Empyema is collection of pus in pleural space (space between lungs and the inner sufcace of chest wall)
Risk factors :
•Trauma or injury to the chest.
•Excessive sweating, especially night sweats.
•Fever and chills.
•General discomfort, uneasiness, or ill feeling (malaise).
•Shortness of breath.
•Weight loss (unintentional).