Oxygen therapy originated in Western Europe and is an advanced method of fitness. At the end of the 1960s, West Germany began research and application of oxygen therapy. Since the 1980s, Mexico, the United States, and Japan have successively carried out oxygen therapy, especially in Japan, where small oxygen machines have become popular health products. In economically developed countries, oxygen inhalation has become a fashion, with more than 20% of households owning small oxygen-generating equipment for family members to carry out oxygen therapy.