Sleep apnea hypoventilation syndrome, there is a risk of causing cardiovascular and cerebrovascular diseases, sleep disorders and other complications, and even life-threatening. 1. Cardio-cerebral vascular disease: Sleep apnea hypoventilation syndrome has a wide range of effects on the cardio-cerebral vascular system, the disease itself is one of the important causes of secondary hypertension, but also an independent risk factor for cerebral vascular disease such as stroke. In addition, cardiac arrhythmia is also common in sleep apnea hypoventilation syndrome. 2. Sleep disorders: Sleep apnea hypoventilation syndrome will cause patients to suffer from recurrent obstructive sleep apnea and hypoventilation during sleep, leading to sleep disruption and seriously affecting their sleep quality. 3. Life-threatening: the development of the disease may lead to increased cardiac excitability due to decreased blood oxygen and increased blood carbon dioxide, which may lead to sudden death. It may also lead to myocardial infarction due to ischemia and hypoxia, which is life-threatening. The potential risks of sleep apnea hypopnea should not be ignored, and individuals with suspected symptoms should seek prompt medical attention.