Frequently Asked Questions
Straight answers about what causes fatigue, how testing works, and what to expect — from our Wilmington functional medicine practitioners.
These are the questions patients ask us most about persistent fatigue, low energy, and root-cause testing. If you have been told your labs are normal but still feel exhausted, start here — then book a free discovery call if you want to talk through your own situation.
Frequently Asked Questions
What is the biggest cause of fatigue in society today?
The biggest driver of fatigue today is ongoing, unmanaged stress that overworks your body's stress-response system: constant demands, poor sleep, and digital overload keep your adrenal glands releasing cortisol at the wrong times and in the wrong amounts, leaving you wired at night, sluggish in the morning, and burned out even when your basic lab work looks normal.
Your adrenal glands sit on top of your kidneys and release cortisol to help you deal with challenges and give you a short burst of energy and focus. Modern life keeps that system switched on around the clock. Over time, cortisol gets pushed out in a disrupted rhythm, and the result is the kind of exhaustion that sleep alone does not fix.
This is why we look at an adrenal stress profile (HU-Map) alongside blood work — a cortisol rhythm problem is invisible on standard labs but shows up clearly when we measure stress hormones across the day.
Does the thyroid play a role in my fatigue?
Yes, an underactive thyroid is one of the most common and most overlooked causes of fatigue, because when the thyroid does not make enough hormone, every cell in your body — brain, muscle, metabolism — runs in slow motion, showing up as heavy fatigue, difficulty getting out of bed, extra naps or caffeine, and hitting a wall much sooner than you used to.
If you are dealing with stubborn low energy, it is important to look closely at your thyroid — not just a quick TSH screening number, but whether your body is actually making and using enough active thyroid hormone. TSH alone does not tell you whether your body is converting thyroid hormone properly.
At our Wilmington practice, thyroid testing is part of a broader fatigue evaluation, because treating the thyroid in isolation rarely works when stress hormones, iron status, or viral triggers are also in play.
Can my anemia be causing my fatigue?
Yes, anemia and low iron are very common and very real causes of fatigue, because when your iron is low your body cannot make enough healthy red blood cells or those cells cannot carry oxygen well, and since oxygen is the fuel every cell uses to make energy, you feel tired, weak, short of breath with simple activities, and sometimes lightheaded or foggy.
If you are anemic, you can have significant fatigue even if your thyroid is treated and your sleep is good. That is why we look at iron, ferritin, and the full blood counts whenever low energy is a major complaint — these markers are often skipped in a routine workup.
Correcting iron status is sometimes the missing piece that finally makes everything else — sleep, exercise recovery, mental clarity — start working again.
Can Lyme disease be causing my fatigue?
Yes, Lyme disease can absolutely be a contributor to your fatigue, because the tick-borne infection can linger in the body and place a constant strain on your nervous and immune systems, leaving you exhausted, achy, foggy, and wiped out even after what should be a normal day.
In many people, Lyme also disrupts how well cells make energy, so your cellular batteries run low far more often than they should. If you have a history of Lyme and stubborn fatigue that does not match your activity level, it is worth considering that the infection — or its after-effects — may still be playing a role.
We evaluate infectious contributors as part of a full fatigue workup, alongside thyroid, iron, and stress-hormone testing, so that one driver does not hide another.
I suspect a virus might be at the heart of my fatigue. Is this possible?
Yes, a lingering viral infection can absolutely be part of the fatigue picture, and Epstein-Barr virus (EBV) is one of the most common culprits: it can stay in the body long after the initial illness and keep your immune system in a low-grade fight mode, draining your energy, creating inflammation, and interfering with how your cells produce and use energy.
For many people this feels like a deep, flu-like tiredness that never fully lifts, along with brain fog, unrefreshing sleep, and slower recovery after even mild activity.
If your fatigue started around a significant viral illness or never went away afterward, it is reasonable to explore whether a chronic viral load is one of the drivers. Testing can reveal whether EBV or another infectious contributor is still active in your system.
Can hormone deficiencies cause fatigue?
Yes, hormone imbalances are some of the most common and most overlooked causes of fatigue, because your thyroid and adrenal hormones act as the body's energy-control system and sex hormones such as estrogen, progesterone, and testosterone affect sleep, muscle strength, and motivation — when these hormones are low, out of rhythm, or not communicating well, your cells simply cannot make and use energy efficiently.
When cortisol, thyroid hormone, or sex hormones are too low or out of rhythm, you can feel tired no matter how much you sleep, and shifts in estrogen, progesterone, and testosterone add another layer of exhaustion through disrupted sleep and slower recovery.
This is why a good fatigue workup includes a careful look at multiple hormone systems — stress hormones, thyroid, and sex hormones together — rather than a single lab value.
What is hypometabolic syndrome and how does it cause fatigue?
Hypometabolic syndrome is a low-metabolism state where your body has turned the dial down on energy production, putting your cells into power-saving mode so there is less fuel available for your brain, muscles, digestion, and repair — which is why people in a hypometabolic state feel deeply tired, heavy, and slow even when they are not doing very much.
It can be triggered or worsened by chronic stress, long-standing illness, poor nutrition, and hormone or thyroid imbalances — all of which tell the body to pull back and conserve.
Because hypometabolic patterns hide on standard labs, spotting them usually takes a deeper look at how your cells are actually producing and using energy, such as an Organic Acids Test alongside blood and hormone work.
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.