Pain and Fatigue

Chronic pain and fatigue present differently in every person — in location, intensity, character, and the constellation of accompanying symptoms. What they share is persistence: symptoms that outlast their expected cause, recur without clear provocation, and resist straightforward treatment.

Pain may be widespread or localized, burning or aching, constant or fluctuating. Fatigue may manifest as physical exhaustion, cognitive fog, post-exertional malaise, or an inability to recover after even modest activity. For many patients, pain and fatigue coexist — each amplifying the other in a cycle that is difficult to break without addressing both.

Common symptoms include:

• Persistent pain lasting more than three months, in one area or throughout the body
• Deep fatigue not relieved by sleep or rest
• Post-exertional malaise (worsening of symptoms after physical or mental effort)
• Sleep disturbances — difficulty falling asleep, staying asleep, or waking unrefreshed
• Cognitive difficulties ("brain fog") — poor concentration, memory lapses, word-finding problems
• Headaches or migraines
• Heightened sensitivity to pain, touch, light, or sound
• Mood changes — depression, anxiety, and irritability frequently accompany chronic pain and fatigue
• Muscle weakness, joint stiffness, or reduced range of motion
• Dizziness, heart rate irregularities, or blood pressure fluctuations (particularly in dysautonomia)
• Digestive symptoms — nausea, bloating, IBS-like symptoms
• Low-grade fevers or flu-like feelings, especially in infectious or autoimmune-related fatigue

If you're living with chronic pain or fatigue, you are far from alone. More than 50 million Americans deal with chronic pain, and up to 2.5 million live with chronic fatigue syndrome — most of whom were never properly diagnosed. These are not rare or unusual conditions. They are simply under-recognized ones.

Anyone can be affected, at any age. While chronic pain and fatigue tend to be more common in midlife and beyond, they also affect children, teenagers, and young adults. Women are more frequently impacted — particularly by conditions like fibromyalgia, ME/CFS, and lupus — and are also more likely to have their symptoms minimized or misattributed to stress or anxiety. People who have experienced trauma, a serious infection, or a period of prolonged illness are also at higher risk. If any of that sounds familiar, you're in the right place.

Standard diagnosis of chronic pain typically relies on clinical history, physical examination, and imaging such as X-rays, MRIs, or CT scans. For fatigue, a conventional workup usually includes basic blood panels — complete blood count, thyroid function, iron levels, and metabolic markers. These tools are valuable for ruling out serious structural or systemic illness, but they frequently return normal results in patients with significant chronic pain or fatigue — leaving patients without answers and without a treatment path.

Chronic fatigue syndrome in particular, has no definitive biomarker under conventional testing. Diagnosis is typically clinical, based on symptom duration and the exclusion of other conditions. This means many patients go undiagnosed or misdiagnosed for years.

Integrative and Functional Testing

Functional medicine testing goes considerably deeper, examining the biological systems that standard panels leave unassessed. At GWCIM, depending on your clinical picture, testing may include comprehensive inflammatory markers (including high-sensitivity CRP, IL-6, and other cytokines), full thyroid panel with antibodies, adrenal function and cortisol rhythm testing, sex hormone panels, food sensitivity testing (IgG/IgE), gut microbiome analysis, nutritional and micronutrient assessment (including vitamins B12, D, magnesium, zinc, and iron), mitochondrial function markers, heavy metal and environmental toxin panels, and infectious disease panels (including Lyme disease, EBV, HHV-6, and other chronic infections). These tests often reveal the specific imbalances driving a patient's symptoms — imbalances that were present all along but simply never looked for.

Chronic pain and fatigue rarely have a single cause — which is why single-treatment approaches so rarely bring lasting relief. Common drivers include:

For chronic pain: a hypersensitized nervous system (central sensitization), chronic inflammation, unresolved trauma, hormonal imbalances, and structural or autoimmune conditions.

For chronic fatigue: adrenal or thyroid dysfunction, chronic infections (Lyme, Epstein-Barr, and others), mitochondrial dysfunction, autoimmune conditions, gut dysbiosis, dysautonomia, and post-infectious states, including Long COVID.

Across both: nutritional deficiencies, poor sleep, and the well-established connection between mental health and physical symptoms — depression and anxiety don't just accompany pain and fatigue, they share biological pathways with them and need to be addressed together.