In recent years, the role of oxygen therapy in health care has become more and more important to people. Home oxygen therapy is gradually becoming a fashion, and oxygen is one of the most direct and effective treatment measures to improve hypoxic diseases. However, if improperly applied and poorly supervised, certain side effects can occur, bringing pain and even life threatening to people. 1, the health care role of home oxygen therapy Oxygen therapy can be supplemented with oxygen to improve the internal environment of the human body, to promote the benign cycle of metabolism, in order to achieve the purpose of treating diseases, relieving symptoms, promoting recovery, preventing diseases and improving health. The health care effects of oxygen therapy mainly include: (1) eliminate fatigue, improve work efficiency: human brain oxygen consumption accounts for 20% of the whole body, and is particularly sensitive to oxygen deficiency. Insufficient oxygen supply will cause fatigue syndrome such as lack of physical strength, physical incompetence, dizziness, insomnia, memory loss and loss of appetite, which will affect people’s intelligence and work efficiency, and oxygen intake can significantly improve the above symptoms. (2) Improve body resistance, expel and prevent diseases: oxygen inhalation can enhance the metabolism of human cells, tissues and organs, enhance the functions of various organs, improve the immunity of the body, and have a good effect on the prevention and treatment of common diseases such as cerebral insufficiency, cerebral infarction, coronary heart disease, asthma and neurasthenia. (3) Beauty and beauty: inhalation can enhance the aerobic metabolism of human cells, strengthen skin nutrition, make loose skin increase elasticity and reduce wrinkles; the enhanced metabolic function of skin cells can reduce melanin deposition, make bruises recede and beautify skin; oxygen inhalation also helps improve hair follicle nutrition, promote hair growth and prevent hair loss. (4) Anti-aging: With the growth of age, vascular sclerosis and lung function decreases, the partial pressure of arterial blood oxygen in the body gradually decreases, and it is more obvious for smokers, oxygen intake can obviously improve the partial pressure of oxygen and prevent the occurrence of many geriatric diseases. (5) improve the sexual function of elderly men: oxygen health care is a senior strengthening method, oxygen can enhance vision, improve presbyopia; oxygen can also improve the Ribbit index, improve male sexual function, maintain vigorous energy to improve the quality of life, oxygen can also promote the recovery of physical strength after exercise. 2, the indications for home oxygen therapy for the elderly ⑴Whistling system diseases caused by hypoxia: such as chronic bronchitis, bronchial asthma, emphysema, pulmonary heart disease, silicosis, lung cancer, etc., especially pulmonary heart disease, long-term oxygen therapy can extend the life of patients. (2) Hypoxia caused by cardiovascular diseases: such as panic, chest tightness, breath-holding, coronary artery disease, angina pectoris, myocardial infarction, heart failure, etc. (3) Hypoxic state caused by cerebrovascular diseases: such as dizziness, headache, Meniere’s disease, head rise, cerebral arteriosclerosis, cerebral thrombosis, cerebral embolism, cerebral ischemia, cerebral hemorrhage, etc. (4) Elderly people with brain overdraft, strenuous exercise or working in oxygen-deficient environment can have proper oxygen therapy health care. (5) Hypoxic state caused by other diseases: such as hypertension, hyperlipidemia, hyperviscosity, diabetes, blood disease, cervical spondylosis, anemia, etc. 3, the side effects of home oxygen therapy ⑴whistle dryness: continuous inhalation of unhumidified and high concentration of oxygen, while gas flow leads to increased evaporation of water from the whistle, the bronchial mucosa is damaged by dry stimulation, resulting in thick secretions, not easy to cough up, aggravating the patient’s whistle difficulty, and even prone to cause whistle infection. (2) Whistling inhibition: home oxygen therapy is most suitable for patients with chronic lung disease, such patients are in a long-term relative hypoxia, the partial pressure of oxygen in arterial blood decreases, the partial pressure of CO2 increases, the sensitivity of the whistling center to changes in CO2 concentration decreases, such patients whistling movement is mainly through hypoxia to stimulate peripheral chemoreceptors and maintain the whistling movement. When the patient inhales too much oxygen concentration, the partial pressure of oxygen in the blood rises in a short period of time, the “hypoxic” factors that stimulate whistling disappear, and the patient will have progressive difficulty in whistling or even whistling stop. (3) oxygen toxicity: the most likely to occur in home oxygen therapy is pulmonary oxygen toxicity, the lungs are the highest oxygen concentration and oxygen partial pressure organs, most likely to produce too much reactive oxygen and oxygen toxicity. The earliest adverse reactions of pulmonary oxygen toxicity are retrosternal discomfort, chest pain, coughing, and in severe cases, increased coughing presenting spasmodic cough, mucus sputum or bloody foamy sputum, shortness of breath with shortness of breath, chest suffocation, and shortness of breath. (4) Pulmonary atelectasis Inhaled oxygen concentration greater than 80% can change the normal mixing ratio of oxygen and nitrogen in the alveoli, oxygen replaces nitrogen, so that the original expansion of the alveoli, atrophy, followed by pulmonary atelectasis. 4, home oxygen therapy precautions ⑴ Reasonable choice of oxygen time. For patients with severe chronic bronchitis and emphysema, with clear lung function abnormalities and oxygen partial pressure continuously below 60 mmHg, oxygen therapy should be given for more than 15 hours a day; for some patients who usually have no or only mild hypoxemia, oxygen can be given for a short time to reduce the discomfort of “shortness of breath” when they are active, stressed or tired. (2) Pay attention to the control of oxygen flow. Generally, it is 1~2 liters/minute, and the flow rate should be adjusted before use. (3) Nasal catheter, nasal plugs, and wetting bottles should be disinfected regularly. (4) Pay attention to the wetting of oxygen. Most of the oxygen humidity released from the compressed bottle is less than 4%, and low flow oxygen is generally applied to the bubble type wetting bottle, and 1/2 of cold boiled water should be added to the wetting bottle. (5) oxygen cylinder oxygen can not be used up, to prevent the re-inflation of dust impurities into the bottle caused by the explosion. (6) Pay attention to the safety of oxygen. The oxygen supply device should be shockproof, oilproof, fireproof and heatproof. When handling oxygen cylinders, avoid tipping and crashing to prevent explosion.