What's Causing Your Fatigue?
Persistent fatigue is one of the most common complaints in healthcare and one of the most under-evaluated. The specific imbalances below each have measurable lab markers — and most are never checked in a standard workup. If you've been told everything is "normal" but you still feel exhausted, the cause is often something concrete that simply hasn't been looked for yet.
Why Fatigue Gets Dismissed
A basic checkup looks at a narrow set of markers chosen to catch disease, not to explain why your energy is low. Thyroid function is often reduced to a single TSH number, iron is barely glanced at, and infections like Lyme disease or Epstein-Barr virus are rarely considered at all. When nothing in that narrow set is overtly abnormal, the conversation tends to end with advice to sleep more and manage stress.
Meanwhile the real driver keeps working. The good news is that every contributor below has specific tests that can rule it in or out. When you look in the right places, "tired all the time" turns into a list of addressable findings instead of a mystery.
The pattern is remarkably consistent: you leave a standard appointment with normal-sounding numbers and no explanation, while activities you used to do without thinking now require planning and recovery. That gap between how you feel and what the standard workup found is not in your head — it usually means the right marker simply hasn't been measured yet.
The Most Common Causes of Chronic Fatigue
Thyroid Fatigue
An underactive thyroid slows every system down — and a quick TSH screening often misses it.
Adrenal Fatigue
Chronic stress pushes cortisol out at the wrong times, leaving you wired at night and sluggish in the morning.
Chronic Fatigue
Persistent exhaustion with brain fog and post-exertional crashes that rest doesn't fix.
Lyme Disease
A tick-borne infection that strains your immune and nervous systems and drains cellular energy.
EBV & Viral Infections
Epstein-Barr virus can linger after a mono-like illness and keep your immune system fighting.
Hormone Imbalance
Shifts in estrogen, progesterone, and testosterone affect sleep, strength, and motivation.
Anemia & Iron Deficiency
Low iron means less oxygen reaches every cell — tired, weak, and short of breath.
Hypometabolic Syndrome
Your cells drop into power-saving mode, and the pattern hides on standard lab work.
These contributors overlap more often than not. Low iron can worsen thyroid problems, chronic stress can flatten cortisol rhythm and slow metabolism, and a lingering infection can push your body into a hypometabolic state. That's why we look at the whole picture instead of chasing a single lab value — and why our testing panel covers several systems at once.
Who This Evaluation Is For
- You're exhausted most days despite sleeping enough
- Your labs came back normal but you still feel unwell
- Brain fog or low motivation is affecting your work or family life
- You recover slowly from exercise, illness, or stressful weeks
- You want a clear explanation instead of another guess
Ready for Real Answers About Your Fatigue?
Book a free 15-minute discovery call. No cost, no obligation — just a straight conversation about your symptoms and whether root-cause testing is right for you. Available in Wilmington, NC or remotely across North Carolina.
How We Put the Pieces Together
A structured fatigue evaluation starts with your story: when the fatigue began, what makes it worse, what you've already tried, and what prior testing showed. From there we select targeted labs — the right tests for the right clinical picture, not everything for everyone. Depending on your case, that may include comprehensive blood testing (iron studies, full thyroid panel, Lyme antibodies, EBV markers, CBC, metabolic markers), a Organic Acids Test for cellular energy patterns, an adrenal stress profile for cortisol rhythm, and gut testing when digestion is part of the story.
The full process — discovery call, consultation, testing, results review, and follow-up — is laid out on our how it works page. You'll know what's being tested and why before anything is ordered.
Where to Go From Here
If you want a plain-English overview before diving into the individual causes, start with our blog post Why Am I Always Tired?. If you're ready to get answers, book a free 15-minute discovery call — we'll talk through your situation and let you know what testing makes sense.
Many fatigue patients are too tired to travel. We arrange remote testing across North Carolina — lab kits mailed to your door, results reviewed with our team. You can also reach us at (910) 444-9438.