Laryngeal obstruction is a condition in which the laryngeal airway is narrowed by a lesion in the larynx or adjacent organs, resulting in difficulty in breathing. It is not an independent disease, but a group of syndromes. Laryngeal obstruction can cause hypoxia, which can lead to asphyxia and endanger the patient’s life if not treated in time. Due to the different acute and slow onset, there are two types of laryngeal obstruction: acute and chronic. The causes of laryngeal obstruction are as follows: 1. Inflammation, such as acute epiglottitis, pediatric acute laryngitis, acute laryngotracheobronchitis. Inflammation of adjacent parts of the larynx, such as retropharyngeal abscess, lateral pharyngeal infection, submandibular cellulitis, etc. 2, foreign bodies in the larynx, especially larger embedded foreign bodies, such as plastic bottle caps, glass balls, large Chinese medicine pills, etc. 3, laryngeal trauma, such as laryngeal contusions, bruises, crush injuries, cuts, explosions, burns, laryngeal tracheal intubation injuries, endoscopy injuries, etc. 4.Pathogenic edema or neurovascular edema. 5.Bilateral paralysis of the recurrent laryngeal nerve (mostly seen in thyroidectomy). Chronic laryngeal obstruction: 1, the sequelae of laryngeal trauma, such as scar laryngeal stenosis, medical injury (such as tracheotomy, endoscopy, tracheal intubation, especially long-term intubation with a balloon) caused by laryngeal granulation tissue hyperplasia or cartilage scaffold necrotic lesions. 2, scarring hyperplasia caused by benign and malignant laryngeal tumors after surgery (such as more extensive vocal cord papilloma, various types of hemilaryngectomy). 3, compression of neck lesions, such as neck tumors, giant goiter, metastatic cancer of the neck, etc.