<p>Oxygen therapy, also known as&nbsp;supplemental oxygen, is the use of&nbsp;oxygen&nbsp;as a&nbsp;medical treatment. This can include for&nbsp;low blood oxygen,&nbsp;carbon monoxide toxicity,&nbsp;cluster headaches, and to maintain enough oxygen while&nbsp;inhaled anesthetics&nbsp;are given. Long term oxygen is often useful in people with chronically low oxygen such as from severe&nbsp;COPD&nbsp;or&nbsp;cystic fibrosis. Oxygen can be given in a number of ways including&nbsp;nasal cannula,&nbsp;face mask, and inside a&nbsp;hyperbaric chamber.</p>