Sleep apnea hypoventilation syndrome is a sleep breathing disorder of unknown etiology, with clinical manifestations of nocturnal sleep snoring with apnea, daytime drowsiness,, difficulty concentrating, increased nocturnal urination, headache, personality changes and other systemic complications manifested. The recurrent episodes of nocturnal hypoxia and hypercapnia caused by apnea can lead to complications such as hypertension, coronary heart disease, diabetes and cerebrovascular disease and traffic accidents. Risk factors ① Gender: Men are about two to eight times more likely to get the disease than women. However, after menopause, women’s chances of developing the disease are comparable to men’s. Age: As we age, the muscle tone of the upper respiratory tract decreases, making collapse more likely to occur. ③Obesity: Those who are greater than 120% of ideal body weight are more at risk. ④Neck circumference: Those who are larger than 43 cm in men and 38 cm in women. ⑤Anatomical abnormalities: too little space behind the tongue or posterior hanging urn, too large tongue, enlarged tonsils, too much soft tissue in the mouth and nasopharynx, too high soft jaw, receding jaw, too small jaw or facial deformity. (6) Special congenital disorders: e.g. Down’s syndrome. (vii) Endocrine disorders: such as hypothyroidism, acromegaly. (8) Alcohol consumption, sedatives or sleeping pills may reduce the muscle tone of the upper respiratory tract. Treatment In addition to general treatment such as lateral lying, smoking and alcohol cessation, and weight loss, there are two types of non-surgical treatment and surgical treatment. (a) Non-surgical treatment ①Tranasal continuous positive airway pressure (CPAP) ventilator-assisted respiratory therapy This method is the most effective treatment for moderate to severe patients, and most patients can achieve satisfactory treatment results through CPAP therapy. ② Oral orthoses, suitable for patients with short jaws, etc. (ii) Surgical treatment The aim of surgical treatment is to reduce and eliminate airway obstruction and prevent collapse of the soft tissues of the airway. The choice of surgical method depends on the site of airway obstruction, the severity, the presence of morbid obesity and the general condition, but not every patient is suitable for surgical treatment.