Nasal endoscopy is an examination procedure that allows the ENT (ears, nose, and throat) specialist to view the nasal and sinus passages, larynx (voice box), pharynx (channel connecting the nose and mouth to the oesophagus) and surrounding structures, using clear and highly magnified images. It is usually performed using either a flexible or rigid endoscope, which is inserted through the nasal passages. The procedure is performed under local anaesthesia to minimise discomfort to the nasal tract.