Sleep apnea hypoventilation syndrome patients due to hypoxia at night, the body will produce multiple systems of damage, including the nervous system, cardiovascular system, respiratory system, endocrine system and so on. Damage to various systems will appear corresponding diseases: 1, the central nervous system: there will be unexplained stroke, including cerebral hemorrhage, cerebral infarction, and time will even appear neurodegenerative diseases, and even cognitive dysfunction; 2, the cardiovascular system: may be more recognized, including hypertension, especially stubborn blood pressure increase, and angina pectoris, congestive heart failure, arrhythmia, etc.; 3, the respiratory system: patients always feel breathless at night, time will cause respiratory rhythm or neurological disorders; 4, the endocrine system: metabolic system-related diseases, such as diabetes mellitus, etc., may be associated with sleep apnea hypoventilation syndrome.