Is it harmful for healthy people to take more oxygen?

A person may survive without eating for several days, but stop breathing for a few minutes (that is, do not inhale oxygen) and will soon die. The human body can't get enough oxygen, which first damages nerve cells in the brain. As long as it is deprived of oxygen for a few minutes, the brain will be irreversibly damaged and brain death will occur. Although oxygen is so important to the human body, from the medical and physiological point of view, any medicine and tonic should be in moderation, and oxygen, as an important essential substance for human life, is no exception. Excessive use of oxygen is not only useless, but also harmful. Scientists have found that animals can be poisoned by inhaling pure oxygen, and so can people. If people are allowed to enter the pure oxygen environment at atmospheric pressure, oxygen poisoning pneumonia will occur over 24 hours, and finally they will die of respiratory failure. Oxygen poisoning is closely related to the time of oxygen inhalation. The longer the time, the more prone to oxygen poisoning. When oxygen enters the body, it will produce oxygen free radicals, which are extremely active and travel around the body, attacking and killing various cells, causing metabolic and functional disorders of cells and organs, and promoting gene mutation to induce cancer. Of course, if there is oxidation, there is anti-oxidation, which is a skill of human self-protection. In the natural state, the healthy human body is in the dynamic balance of oxidation and anti-oxidation exercise. Oxygen therapy is mainly to provide patients with oxygen, ensure their basic life activities and promote disease relief, which has become an extremely important method in clinical medicine. In principle, as long as there is hypoxia, such as dyspnea, gas poisoning, shock, heart failure, altitude hypoxia, etc., oxygen inhalation is necessary. When chronic obstructive pulmonary disease is in remission, long-term family oxygen therapy is also advocated to improve the quality of life. The basic principle of oxygen therapy is to ensure that the body has sufficient oxygen supply without causing adverse reactions. Therefore, oxygen should be given in different ways as needed. Commonly used oxygen therapy methods include controlled oxygen therapy, high concentration oxygen therapy and hyperbaric oxygen therapy. Because the way, time and course of treatment of oxygen inhalation are closely related to the occurrence of oxygen poisoning, and these aspects of knowledge are very professional, it is best to take oxygen reasonably under the guidance of doctors, so as to achieve advantages and avoid disadvantages and give full play to the role of oxygen as the source of life.