Oxygen therapy is the administration of oxygen at concentrations greater than that in the rooms air to either treat or prevent hypoxemia (not having enough oxygen in the blood). Oxygen therapy increases the amount of oxygen in the blood, reducing extra work from the heart and decreasing shortness of breath. Home oxygen therapy must be prescribed by a doctor. Home oxygen therapy is delivered by compressed gas, liquid oxygen or oxygen concentrator. People with asthma, emphysema, chronic bronchitis, occupational lung disease, lung cancer, cystic fibrosis, or congestive heart failure may benefit from home oxygen therapy. Oxygen therapies include ozone, ozone saunas, ozonated water, ozonated oils, steam saunas, oxygen chambers and detoxification therapies. Oxygen therapies have many therapeutic uses and are said to have beneficial effects on every part of the body.