Functional Integrative Health · Supplementary · from Functional Integrative Health

Case 1: Chronic Fatigue with Integrative Approach

Patient Presentation

Demographics: 38-year-old female marketing executive

Chief Complaint: "I've been exhausted for over a year and nothing seems to help."

History of Present Illness: The patient presents with a 14-month history of debilitating fatigue that has progressively worsened despite adequate sleep duration. She reports sleeping 8-9 hours nightly but waking unrefreshed. Her fatigue is accompanied by cognitive difficulties she describes as "brain fog," including poor concentration, word-finding difficulties, and short-term memory lapses that have begun affecting her work performance.

She has seen her primary care physician and an endocrinologist, with standard bloodwork including CBC, CMP, TSH, and hemoglobin A1c all returning within normal limits. She reports intermittent low-grade headaches, diffuse myalgias, and a sensation of swollen lymph nodes in her neck that wax and wane. She denies fever, weight loss, or night sweats.

Her symptoms began approximately two months after a confirmed COVID-19 infection (mild, managed at home). She has tried various over-the-counter supplements without sustained improvement. She rates her energy as 3/10 on most days, compared to her baseline of 8/10 prior to illness.

Past Medical History:

• COVID-19 infection (14 months ago, mild course)
• Seasonal allergies
• Anxiety disorder (well-controlled)

Medications:

• Escitalopram 10 mg daily
• Cetirizine 10 mg as needed
• Multivitamin daily

Social History:

• Non-smoker, occasional alcohol (1-2 glasses of wine per week)
• Sedentary due to fatigue (previously ran 3x/week)
• High-stress job with long hours
• Lives with partner, no children
• Diet: mostly processed/convenience foods due to fatigue

Family History:

• Mother: Hashimoto thyroiditis, fibromyalgia
• Father: Type 2 diabetes
• Sister: Celiac disease

Physical Examination

• Vital Signs: BP 108/68 mmHg, HR 78 bpm, RR 14, Temp 37.0°C, SpO2 98% RA, BMI 24.2
• General: Well-appearing but fatigued-appearing female, no acute distress
• HEENT: Mild pharyngeal erythema, small bilateral anterior cervical lymph nodes palpable (< 1 cm, mobile, non-tender)
• Cardiovascular: Regular rate and rhythm, no murmurs
• Respiratory: Clear to auscultation bilaterally
• Abdomen: Soft, non-tender, mild bloating in lower quadrants
• Musculoskeletal: No joint swelling, mild tenderness at trapezius and paraspinal muscles bilaterally
• Neurological: Cranial nerves II-XII intact, normal strength and sensation, mildly delayed serial 7s

Workup and Results

Laboratory Studies:

Imaging/Additional Studies:

• DUTCH Complete Hormone Test: Suboptimal cortisol awakening response with blunted diurnal curve
• GI-MAP stool analysis: Low Akkermansia muciniphila, elevated zonulin at 88 ng/mL (ref < 60), low secretory IgA
• Heart rate variability (HRV) assessment: Reduced parasympathetic tone, elevated sympathetic dominance

Clinical Image

Integrative assessment framework showing the interconnected systems evaluated in chronic fatigue: neuroendocrine, immune, gastrointestinal, mitochondrial, and psychosocial domains. Source: Educational illustration.

Diagnosis

Post-COVID Chronic Fatigue Syndrome with Subclinical Autoimmune Thyroiditis, Micronutrient Deficiencies, and Intestinal Hyperpermeability

Key Diagnostic Criteria:

• Persistent fatigue > 6 months following viral infection with post-exertional malaise
• Cognitive impairment ("brain fog") affecting daily function
• Unrefreshing sleep despite adequate duration
• Elevated anti-TPO antibodies with low-normal free T3 suggesting early Hashimoto thyroiditis
• Suboptimal ferritin, vitamin D deficiency, and low omega-3 index
• Elevated zonulin indicating intestinal hyperpermeability
• Blunted cortisol awakening response suggesting HPA axis dysregulation

Treatment Plan

1. Nutritional optimization: Iron bisglycinate 36 mg daily with vitamin C, vitamin D3 5000 IU daily with K2, methylcobalamin 1000 mcg sublingual daily, omega-3 fatty acids (EPA/DHA) 2 g daily
2. Gut restoration protocol: L-glutamine 5 g daily, spore-based probiotics, bone broth or collagen peptides, elimination of gluten for 8-week trial given family history and elevated zonulin
3. Adrenal support: Ashwagandha (KSM-66) 600 mg daily, phosphatidylserine 100 mg at bedtime, morning light exposure within 30 minutes of waking
4. Graduated activity: Pacing strategy with heart rate monitoring, gentle yoga 3x/week, progressive walking program staying below anaerobic threshold
5. Mind-body medicine: Mindfulness-based stress reduction (MBSR) 8-week program, vagal nerve stimulation exercises, sleep hygiene optimization
6. Monitoring: Recheck anti-TPO, ferritin, vitamin D, hs-CRP, and free T3 in 12 weeks; refer to integrative medicine physician for ongoing co-management

Key Learning Points

• Chronic fatigue requires evaluation beyond standard labs; functional markers including ferritin (optimal > 50 ng/mL), free T3, vitamin D, and inflammatory markers provide a more complete picture
• Post-COVID fatigue may involve HPA axis dysregulation, neuroinflammation, and gut-immune disruption that standard workup fails to capture
• Subclinical Hashimoto thyroiditis (elevated anti-TPO with "normal" TSH) can contribute to fatigue, especially when free T3 is suboptimal
• Intestinal hyperpermeability (elevated zonulin) can drive systemic inflammation and immune dysregulation, making gut assessment essential in chronic fatigue
• Integrative treatment plans address root causes across multiple systems simultaneously rather than treating symptoms in isolation

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