Struggling with brain fog in Greenville, SC? Dr. Hendry identifies root causes like inflammation, hormonal shifts, and gut dysfunction and treats them naturally. Call (864) 365-6156.
★★★★★
"I have been going to Dr. Hendry for 2 months now, for Acupuncture and Supplements. After 2 months, this is the best I have felt in over 2 years. My energy is so much better, my gut and digestion is back to normal."
— Danny Pyatt · March 2026 · Google Review
What Is Brain Fog?
Brain fog is not a medical diagnosis but a widely reported constellation of symptoms: mental cloudiness, difficulty concentrating, poor memory, slowed thinking, and a general sense of cognitive inefficiency. It is a common feature of fibromyalgia, chronic fatigue syndrome, hormonal imbalances, thyroid dysfunction, post-COVID syndrome, autoimmune conditions, and various nutritional deficiencies. Identifying the underlying cause is essential — brain fog is a symptom with many roots.
Common Symptoms
Difficulty concentrating or staying focused
Poor short-term memory — forgetting words, names, or tasks
Slowed thinking — taking longer than usual to process information
Mental fatigue — the brain tires quickly with cognitive tasks
Difficulty finding words or completing sentences
Detachment or a feeling of being 'in a fog'
Reduced problem-solving ability and decision fatigue
Cognitive symptoms that worsen after eating (reactive hypoglycemia), exertion (post-exertional malaise), or stress
Root Causes: A Functional Medicine Perspective
Brain fog is almost always driven by one or more of these physiological mechanisms: neuroinflammation (from gut dysbiosis, food sensitivities, autoimmune activity, or systemic infection), cerebral hypoperfusion (inadequate blood flow to the brain from cardiovascular or hemodynamic issues), mitochondrial dysfunction (reducing cellular energy in neurons), hormonal imbalance (thyroid, sex hormones, insulin), or nutritional deficiency (B12, iron, omega-3, vitamin D).
Post-COVID brain fog — now recognized as a major component of Long COVID — involves a combination of neuroinflammation, mitochondrial dysfunction, endothelial damage, and gut microbiome disruption. Dr. Hendry has developed specific protocols for post-COVID cognitive recovery that address each of these mechanisms.
How We Treat Brain Fog at IHP
Functional medicine testing identifies the specific biological drivers — comprehensive metabolic panels, thyroid panels, inflammatory markers, nutritional assessments, hormonal panels, and microbiome analysis. Once identified, targeted interventions address each driver: anti-inflammatory dietary changes, gut healing protocols, mitochondrial support supplementation, hormonal optimization, and targeted nutrient repletion.
Acupuncture improves cerebral blood flow, reduces neuroinflammation, and regulates the autonomic nervous system — all of which support cognitive clarity. Many patients report significant improvement in mental clarity within a few weeks of combined treatment.
Dr. Hendry's Approach
I take brain fog seriously as a physiological condition, not a complaint to be reassured away. In my clinical experience, most brain fog has one or more identifiable biological drivers — and they show up on testing. Neuroinflammation. Subclinical thyroid dysfunction. Blood sugar dysregulation. B12 or iron deficiency. Post-viral mitochondrial impairment. The evaluation that misses these is the one that doesn't look for them. My approach is systematic: identify the drivers, address them specifically, and track cognitive improvement objectively. Telling a patient their cognition should be fine given their age is not a clinical answer.
Dr. Hendry assesses thyroid function (full panel including T3 and antibodies), blood count (iron and B12), inflammatory markers (hsCRP, homocysteine), blood sugar regulation, hormonal panel, and when indicated, gut permeability and microbiome markers. Standard medical workups frequently miss the drivers of brain fog.
Long COVID brain fog is real but typically reversible. Research shows active neuroinflammation and mitochondrial dysfunction drive cognitive symptoms. With targeted functional medicine treatment — gut repair, mitochondrial support, anti-inflammatory protocols, and acupuncture — most patients show significant improvement over 3–12 months.
Yes, significantly. Blood sugar dysregulation (from refined carbohydrates and sugars), gluten sensitivity (which causes neuroinflammation in genetically susceptible individuals), food additives, and inflammatory dietary patterns all impair cognitive function. Dietary changes are often among the fastest-acting brain fog interventions.
Yes. Even subclinical hypothyroidism — where TSH is elevated but still within the 'normal' range — causes significant cognitive impairment in many patients. Dr. Hendry uses a more clinically meaningful optimal range for thyroid function assessment.
Depends on the cause. Nutritional deficiency correction can improve cognition within days to weeks. Hormonal optimization takes 4–12 weeks. Gut healing and neuroinflammation reduction typically shows improvement over 2–3 months with consistent treatment.
Brain fog is a symptom, not a diagnosis — identifying the cause requires systematic evaluation. The most common biological drivers are: neuroinflammation (from gut dysbiosis, food sensitivities, autoimmune activity, or systemic infection), thyroid dysfunction (even subclinical), blood sugar dysregulation (reactive hypoglycemia impairs cerebral glucose supply), hormonal imbalance (estrogen, progesterone, testosterone, and cortisol all affect cognition), nutritional deficiencies (B12, iron, vitamin D, omega-3s), poor sleep (during deep sleep the glymphatic system clears metabolic waste from the brain), and mitochondrial dysfunction (neurons are among the highest energy-demanding cells in the body). Most brain fog involves more than one driver — which is why single-supplement approaches rarely resolve it.
Directly and significantly. The gut-brain axis connects the enteric nervous system, the vagus nerve, and the central nervous system in both directions. Gut dysbiosis produces LPS endotoxins that cross a compromised gut barrier and trigger neuroinflammation. The gut microbiome also produces neurotransmitter precursors — including about 90% of the body's serotonin — and short-chain fatty acids that directly influence brain function. Healing the gut is one of the most reliably effective interventions for brain fog in Dr. Hendry's clinical experience.
The most clinically impactful nutrients are those that are commonly deficient and have clear neurological roles: vitamin B12 (essential for myelin maintenance and neurotransmitter synthesis — deficiency causes measurable cognitive impairment), methylfolate (especially important with MTHFR variants), omega-3 fatty acids EPA and DHA (structural components of neuronal membranes and anti-inflammatory mediators), vitamin D (deficiency associated with cognitive decline and neuroinflammation), magnesium (essential for neurological function, depleted by stress), and iron (particularly in premenopausal women — iron deficiency impairs oxygen delivery to the brain before anemia develops). Dr. Hendry tests for these specifically rather than assuming supplementation is appropriate.