吸氧用于纠正缺氧，提高动脉血氧分压和氧饱和度的水平，促进代谢，是辅助治疗多种疾病的重要方法之一。如呼吸衰竭，慢性气管炎，脑血管病，冠心病。临床缺氧症状不明显者，也可能存在着氧债，也可能微循环代谢异常，因而可能需要吸氧。如某些外科手术前后病人、大出血休克病人、胎心音不良或分娩时产程过长等病人等。
Oxygen inhalation is used to correct hypoxia, improve the level of arterial oxygen partial pressure and oxygen saturation, and promote metabolism. It is one of the important methods to assist in the treatment of many diseases. Such as respiratory failure, chronic tracheitis, cerebrovascular disease, coronary heart disease. The patients with no obvious clinical symptoms of hypoxia may also have oxygen debt or abnormal microcirculation metabolism, so they may need oxygen inhalation. For example, patients before and after some surgical operations, patients with massive hemorrhage and shock, patients with poor fetal heart sound, or patients with long delivery process, etc.