Chronic Fatigue Syndrome, officially known as Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS), is a complex, long-term biological illness that affects multiple body systems. It is characterized by extreme exhaustion that interferes with daily activities and does not improve significantly with rest. 

​

Core Symptoms

A person typically must experience three "core" symptoms for at least six months (three months for children): 

• Profound Fatigue: Severe exhaustion that is new, not caused by unusually difficult activity, and not relieved by sleep.

• Post-Exertional Malaise (PEM): Often called a "crash," this is a worsening of symptoms after even minor physical, mental, or emotional activity. It usually occurs 12 to 48 hours after the activity and can last for days or weeks.

• Unrefreshing Sleep: Waking up feeling just as tired as before going to sleep, often accompanied by difficulty falling or staying asleep. 

  ​

Additional Diagnostic Features

Beyond the core symptoms, a diagnosis with at least one of the following: 

• Cognitive Impairment ("Brain Fog"): Difficulty thinking quickly, concentrating, or remembering details.

• Orthostatic Intolerance: Symptoms like dizziness, lightheadedness, or a racing heart that worsen when standing or sitting upright and improve when lying down. ​

 

Common Associated Symptoms

Many patients also experience a range of other physical issues: 

• Pain: Widespread muscle aches and joint pain without swelling or redness.

• Flu-like Symptoms: Frequent sore throats and tender or swollen lymph nodes in the neck or armpits.

• Sensory Sensitivities: Heightened sensitivity to light, sound, smells, or certain foods and chemicals.

• Autonomic Issues: Difficulty regulating body temperature, night sweats, and digestive problems like irritable bowel syndrome (IBS). 

  ​

Potential Triggers

While the exact cause is unknown, researchers believe it may be triggered by several factors: 

• Infections: Many cases begin after a viral or bacterial illness, such as Epstein-Barr virus (mono) or COVID-19 (Long COVID).

• Physical or Emotional Trauma: Significant stress, surgery, or serious injury.

• Genetics: Evidence suggests it can run in families.

• Energy Metabolism Problems: Differences in how the body's cells convert fuel into energy. 

 

Scientific research on Hyperbaric Oxygen Therapy (HBOT) for Chronic Fatigue Syndrome (CFS) indicates that increasing oxygen saturation in the blood can alleviate core symptoms and improve overall quality of life. Reported benefits often focus on restoring energy production at the cellular level and reducing systemic inflammation. 

​

Reported Physical and Cognitive Benefits

Patients and clinical studies have documented improvements in several functional areas: 

• Reduced Fatigue: Significant decreases in both mental and physical fatigue scores have been reported, with some patients noting "very large" improvements in stamina and energy levels.

• Cognitive Clarity: HBOT may help clear "brain fog" by enhancing oxygen delivery to the brain. Studies have shown significant improvements in information processing speed, memory, concentration, and executive function.

• Physical Function and Strength: Significant gains have been measured in exercise capacity (e.g., sit-to-stand tests) and handgrip strength.

• Pain Relief: Many patients experience a reduction in muscle and joint pain, which is often a secondary symptom of CFS.

• Improved Sleep Quality: By helping regulate the body's internal clock and reducing pain, HBOT can lead to more restful and restorative sleep. 

  ​

Biological Mechanisms of Action

The theoretical benefits are driven by how high-pressure oxygen affects the body’s internal environment:

• Mitochondrial Restoration: HBOT provides a boost to mitochondria—the "powerhouses" of the cell—helping them produce energy (ATP) more efficiently.

• Anti-Inflammatory Effects: The therapy reduces the production of pro-inflammatory molecules (cytokines) that contribute to the persistent feeling of illness and pain in CFS.

• Neural Connectivity: Advanced imaging has shown that HBOT can help normalize thalamic hyperconnectivity, a brain signature linked to sensory overload and motor slowing in CFS patients.

• Cellular Repair and Stem Cells: Increased oxygen pressure stimulates the release of stem cells and growth factors, promoting the repair of damaged tissues and new blood vessel formation