Brain Fog & Neurological Recovery

After Stroke

Stroke can leave areas of the brain with impaired blood flow and function even after the initial injury has stabilized.

Research has explored whether hyperbaric oxygen may help stimulate activity in areas of chronically impaired brain tissue and support neuroplasticity—the brain’s ability to reorganize and form new functional connections.

Some studies in chronic stroke patients have reported improvements in areas such as memory, attention, processing speed, executive function, language, and overall neurological function.

The research remains mixed, however, and hyperbaric oxygen should not be considered a replacement for established stroke treatment or rehabilitation.

Mold & Environmental Exposure

Cognitive complaints—including difficulty concentrating, slower thinking, and problems with attention—are sometimes reported by people following significant exposure to water-damaged buildings and mold.

In one small human study, 15 adults with documented mold exposure and abnormalities in attention and reaction time received 10 hyperbaric oxygen treatments.

Following treatment, researchers reported statistically significant improvements in both attention and reaction time on objective testing.

Although intriguing, this was a small preliminary study and larger controlled studies are needed before conclusions can be drawn about the effectiveness of hyperbaric oxygen for mold-related cognitive symptoms.

Brain Fog Following Illness

Researchers are also investigating hyperbaric oxygen for persistent cognitive symptoms following illness.

One randomized, double-blind, sham-controlled study involving people with post-COVID condition found improvements following a 40-session HBOT protocol in global cognitive function, attention, and executive function.

Importantly, these improvements were accompanied by measurable changes in brain perfusion and brain microstructure on MRI.

Other studies have produced less impressive results, however, emphasizing that the science is still developing.

What About Lyme Disease?

Brain fog, problems with concentration, memory difficulties, and mental fatigue are frequently reported by people with persistent symptoms associated with Lyme disease.

At present, however, there is not sufficient controlled clinical research to conclude that hyperbaric oxygen therapy improves Lyme-related cognitive impairment.

This distinction is important.

The biological effects being investigated with hyperbaric oxygen—including effects on oxygen delivery, circulation, inflammation, and neurological function—make this an area of interest, but interest and biological plausibility are not the same as proven clinical effectiveness.

Our Perspective

The emerging research into cognitive function is encouraging, particularly in areas involving neurological injury and certain post-illness cognitive symptoms.

But brain fog can have many causes.

The goal should therefore be to understand why the person is experiencing cognitive difficulties and determine whether mHBOT makes sense as one supportive component of a broader individualized protocol.

At Pivotal Health, mHBOT is offered as an additional level of supportive care—not as a cure for Lyme disease, mold-related illness, stroke, or other neurological conditions.