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.

吸氧可缓解心绞痛、预防心肌梗塞的发生：心绞痛是因急性心肌缺氧所致，心肌持续缺氧30分钟以上者，可造成心肌梗塞的发生，是病人瘁死的一大危险因素。定期保健吸氧或病发时吸氧可预防或缓解心绞痛、心肌梗塞的发生，为治疗争取时间。

Oxygen inhalation can relieve angina and prevent myocardial infarction: angina is caused by acute myocardial hypoxia. If myocardial hypoxia lasts for more than 30 minutes, it can cause myocardial infarction and is a major risk factor for sudden death of patients. Regular health care and oxygen inhalation can prevent or relieve the occurrence of angina pectoris and myocardial infarction, so as to gain time for treatment.