In many other countries around the world such as Great Britain, you would not need to ask this question. Unfortunately, here in the United States, HBOT is not as widely used as its benefits merit. This is partly because the FDA approval process in the United States is slow and very expensive. The FDA has approved hyperbaric oxygen therapy for at least 14 different conditions including severe infections such as gas gangrene and decompression sickness in divers.
The lack of FDA approval makes it difficult to obtain insurance reimbursement which leads physicians to prescribe it less often. In addition, there are less than 50 medical schools in the country that have Hyperbaric Oxygen Chambers on campus used to train physicians. On top of that, already practicing physicians often rely on the drug companies to provide them with continuing education and training opportunities. These drug companies, of course, prefer to teach physicians to use their medications rather than a therapy which does not directly benefit the drug company.