Chest tube insertion is performed to treat conditions such as pneumothorax, massive pleural effusion, and empyema. The procedure involves making a small incision between the ribs and inserting a tube into the pleural space. Lidocaine is used to numb the area first. The tube is then secured and attached to a drainage system to remove air or fluid from the chest cavity. A chest x-ray is obtained after to ensure proper tube placement. Complications can include injury to organs or nerves.