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Oxygen therapy is a type of treatment used by some patients with chronic obstructive pulmonary disease (COPD). COPD causes lung damage that can keep the lungs from being able to absorb enough oxygen. If the body does not have enough oxygen, it cannot function as well as it should.
Oxygen therapy is a medical treatment. 1  It must be prescribed by a doctor. For people with COPD, oxygen therapy can be a helpful part of their treatment plan. The prescription your doctor writes will include: 2  If you need oxygen for rest, exercise and/or sleep, and how much in liters per minute (lpm) for each activity.