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Low blood oxygen, known as hypoxemia, means that the level of oxygen in the blood has fallen below normal levels, due to one or more of many different causes. Under most circumstances, breathing room air, normal readings range from 95 to 100 percent.
Oxygen deficiency is defined as an atmosphere that contains less than the normal percentage (21 percent is considered normal at sea level) of oxygen found in normal air. Oxygen deficiency has been associated with every major disease. This includes cancer, heart disease, and respiratory disease.xygen contributes to ninety percent of our energy. Cancer is believed to have one primary cause and that is that the normal oxygen respiration of the body cells is replaced by oxygen deficient, or anaerobic, cell respiration.