Nocturnal hypoxemia is often caused by obesity, respiratory sleep apnea syndrome, cardiopulmonary diseases, etc. Mild cases can be relieved by changing the sleeping position, etc., while serious cases need to consult a doctor in time and follow the doctor’s instructions for oxygen inhalation and other treatments. Nocturnal hypoxemia refers to the lack of oxygen in the blood at night, arterial partial pressure, blood oxygen saturation and other decreases, the emergence of ventilation dysfunction, there will be dyspnea, skin cyanosis, asthma, irritability, etc., and in severe cases can lead to asphyxia, blood pressure drop, cardiac arrest, digestive bleeding. According to the different causes of nocturnal hypoxemia, there can be the following treatment measures. 1. For nocturnal hypoxemia caused by obesity, in addition to following medical advice to lose weight, it can also be relieved by sleeping on the side and elevating the head of the bed. 2. For nocturnal hypoxemia caused by respiratory sleep apnea syndrome, it is recommended to go to the hospital for a detailed examination to clarify the cause of the disease and diagnosis, and then follow the doctor’s instructions for treatment, and the more serious patients can also use sleep apnea machine. 3. If nocturnal hypoxemia is caused by cardiopulmonary diseases, you should consult a doctor in time. After consulting a doctor, mask oxygen inhalation should be carried out, and if the situation is particularly serious, it is also necessary to establish a tracheal tube channel to guarantee the function of ventilation, correct the disturbance of acid-base balance, and guarantee the function of important organs such as the heart, the brain, and the kidneys. If you can not seek medical attention in time, you can first carry out artificial respiration to ensure the oxygen supply to the heart and brain, and at the same time should be sent to the hospital as soon as possible.