The National Library of Medicine and Centers for Disease Control and Prevention describe Chronic Fatigue Syndrome (CFS) as “a disorder that causes extreme fatigue. This fatigue is not the kind of tired feeling that goes away after you rest. Instead, it lasts a long time and limits your ability to do ordinary daily activities. CFS is hard to diagnose and other illnesses can cause similar symptoms. Your doctor has to rule out other diseases before making a diagnosis of CFS. No one knows what causes CFS. It is most common in women in their 40s and 50s, but anyone can have it. It can last for years. There is no cure for CFS, so the goal of treatment is to improve symptoms.
A medical study published in the Journal of Chronic Fatigue Syndrome (Volume 11, Issue 3, 2003) showed that “certainly, the immediate effect of hyperbaric oxygen therapy is to relieve the cellular hypoxia that is a feature of chronic fatigue syndrome.” A different 2013 study (see link below) determined that hyperbaric oxygen therapy “decreases the severity of symptoms and increases the life quality of CFS patients.