There is much scientific evidence to support the belief that disease may stem from poor oxygenation of cells. Oxygen therapy is about increasing the availability of oxygen to the body tissues. Pedantically, one may argue that breathing techniques and oral supplementation with antioxidants are actually oxygen treatments and one would be right. However, oxygen therapy is generally the term used for intravenous therapies. Ozone and hydrogen peroxide can be introduced directly into the bloodstream and increase the availability directly.
Oxygen has been shown to be of some benefit in cardiac disease, vascular disease, including strokes, and cancer. Work is being done at the moment on HIV and AIDS. Theoretically, enhancing oxygen intake may be of benefit to any condition.
There are risks, however, and intravenous work should only be carried out by qualified medical practitioners or those with experience in emergency resuscitation. It is not so much the oxygen itself that could cause a problem but the fact that the introduction of any chemical directly into the bloodstream can alter the biochemistry rapidly.
Athletes are known to travel to high places to train before major events. This is because of the rarefied atmosphere. Training at that level encourages the body to make more red blood cells to carry more oxygen because there is less available in the air. When the athlete returns to sea level normal atmospheric oxygen appears, to the increased number of red blood cells, to be in abundance. The athlete will potentially benefit by having the oxygen availability increased. There is some evidence coming from the former Soviet Union suggesting that short bursts of low-level oxygen each day may trigger a similar response.
Low blood-oxygen levels at the time of radiation treatment may enhance its effects. It appears that cancer cells are much more susceptible to radiation in the presence of low oxygen, whereas the normal body cells seem to be more prepared to fight its effects. This theory has been put forward following several studies in both Eastern Europe and France but the treatment is not yet widely available. I hope to put the theory into practice through a trial in the very near future.