Bronchoscopy is a procedure that looks inside the lung’s airways to find the cause of a lung problem. It can be used for diagnosis of these conditions: persistent or unexplained cough and blood in the sputum. It can also be used for treatment—to remove foreign bodies in the airway or to remove a mass or growth that is blocking the airway. The procedure doesn’t cause any pain. However, all procedures may involve risk or complications, bronchoscopy may cause the following potential complication: nose bleeding, vocal cord injury, irregular heart beats, bleeding from the site of biopsy and punctured lung.