What chronic fatigue feels like
Fatigue is different from ordinary tiredness. Sleep does not fix it, coffee only masks it, and it lingers for weeks or months. You may wake up unrefreshed, hit a wall in the afternoon, feel too drained to exercise or notice that small tasks take more effort than they used to.
Low energy rarely travels alone. It often comes with brain fog, poor or broken sleep, low mood, weight gain or reduced libido. That overlap is a clue that more than one system may be involved.
Common chronic fatigue causes
Fatigue usually has more than one contributor. The most common fall into three groups.
Hormonal
- Underactive thyroid (hypothyroidism)
- Perimenopause and menopause, especially when night sweats disrupt sleep
- Low testosterone in men
- Chronic stress and a disrupted cortisol rhythm
Metabolic
- Insulin resistance and blood sugar swings
- Iron deficiency or anemia
- Low vitamin B12 or vitamin D
- Inflammation and excess abdominal fat
The afternoon crash: blood sugar and energy
A large, refined-carbohydrate lunch can raise blood sugar quickly, and the insulin response that follows can leave you sleepy and unfocused an hour or two later. With insulin resistance, these swings can become more noticeable. Meals built around protein, fiber and whole foods often steady energy, and markers of blood sugar control show whether insulin resistance is part of the picture.
Lifestyle and medical
Severe fatigue that worsens after exertion and does not improve with rest can also reflect myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), a distinct condition that needs careful diagnosis.
- Short or poor-quality sleep, including sleep apnea
- Depression or anxiety
- Side effects of medications
- Alcohol, inactivity or overtraining
- Lingering fatigue after a viral illness
Hormonal fatigue in perimenopause and in men
Fatigue in perimenopause: sleep, heavy periods and iron
Perimenopause can drain energy in several ways at once. Night sweats and lighter, more broken sleep leave you unrefreshed, and heavier or more frequent periods, which are common in this stage, can lower iron stores and lead to iron-deficiency anemia. Thyroid problems are also more common in women, so a fatigue workup in your 40s usually looks at iron and thyroid function alongside hormones.
Fatigue and low testosterone in men
Persistent fatigue is one of the recognized signs of low testosterone, but it is also one of the least specific: poor sleep, sleep apnea, thyroid problems, depression and insulin resistance cause the same tiredness. Low testosterone is diagnosed only when symptoms are consistent and levels are low on at least two separate early-morning blood tests. If levels are normal, we look for other causes. Our page on low testosterone explains the process.
What we evaluate when you are always tired
Your evaluation starts with a detailed history: when the fatigue began, how you sleep, what you eat, your stress load, medications, cycle or hormone changes and other symptoms. Depending on what we find, comprehensive lab testing may include:
- A complete thyroid panel, not TSH alone
- Sex hormones and, in men, free and available testosterone
- Cortisol and stress response
- Markers of blood sugar control and insulin resistance
- Micronutrient status
- Inflammation markers
Results are read together with your history and symptoms. When labs are normal but fatigue continues, we look for other causes, such as sleep apnea, depression or medication side effects.
How fatigue is treated at our clinic
Treatment targets the drivers your evaluation uncovers, so no two plans look the same. Depending on the findings, a plan may include sleep and stress strategies, nutrition changes guided by our registered dietitian, metabolic support, targeted supplementation when appropriate and hormone therapy only when testing shows a clinical need. Follow-up visits and labs track progress and guide adjustments.
The four-month Hormonal Wellness program is designed for concerns such as fatigue, sleep changes and mood. If fatigue comes with weight concerns, the four-month Vital Wellness program may fit better, and if you also manage a condition such as diabetes or Hashimoto’s, Restore, Longevity or Vibrant Wellness may. Compare the programs on our wellness programs page.
When to see a doctor urgently
Some fatigue needs prompt medical attention rather than a wellness evaluation. Call 911 if fatigue comes with chest pain, shortness of breath, fainting, or sudden weakness or numbness on one side of the body.
See your primary care doctor soon if fatigue comes with unexplained weight loss, fever, drenching night sweats, blood in your stool or very heavy periods. If exhaustion comes with thoughts of suicide or self-harm, call or text 988 to reach the Suicide & Crisis Lifeline.
Getting evaluated in Little Rock, Searcy or Miami
Dr. Tancinco evaluates fatigue in person at our offices in downtown Little Rock, Searcy and downtown Miami, by appointment. If you still feel drained and want to look for the cause, request a free 15-minute discovery call. Our symptom guide also covers related concerns such as weight, mood and libido.
Questions
Common questions about fatigue
What does hormonal fatigue feel like?
Hormonal fatigue tends to feel like a steady drain rather than ordinary tiredness: waking unrefreshed, an afternoon slump, less stamina and needing more effort for everyday tasks. It often comes with other signs, such as poor sleep, low mood, weight changes, feeling cold or reduced libido, depending on whether thyroid hormones, estrogen and progesterone, testosterone or cortisol are involved.
Why am I always tired even after sleeping well?
Feeling tired despite enough sleep can point to a problem with sleep quality rather than quantity, such as sleep apnea, or to causes outside sleep altogether. Thyroid dysfunction, anemia, blood sugar swings, low testosterone, perimenopause, depression and chronic stress are common examples. A detailed history and targeted labs help narrow down which factors apply to you.
Why am I so exhausted during perimenopause?
Perimenopause affects energy from several directions. Night sweats and lighter sleep reduce rest, shifting estrogen and progesterone can affect mood and stress tolerance, and heavier periods can lower iron. Thyroid problems also become more common in midlife. Because these causes overlap, an evaluation that checks sleep, iron, thyroid function and hormones together is more useful than assuming it is just perimenopause.
What vitamin or mineral deficiency causes extreme tiredness?
Iron deficiency, with or without anemia, is one of the most common, especially in women with heavy periods. Low vitamin B12, which is more likely with age, a plant-based diet or some medications, can also cause fatigue, as can low vitamin D. A blood count, iron studies and vitamin levels are common starting points, chosen around your history rather than ordered as a fixed set.
What kind of doctor should I see for constant fatigue?
Start with your primary care doctor, who can check for common causes such as anemia, thyroid problems, sleep apnea and depression. If fatigue continues and several symptoms overlap, a physician who looks at hormones, metabolism, sleep and nutrition together can help. At Vital Longevity Clinic, fatigue is evaluated by a board-certified internal medicine physician. Sudden or severe symptoms need urgent care first.
Is chronic fatigue the same as chronic fatigue syndrome?
No. Chronic fatigue is a symptom with many possible causes. Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a specific long-term condition marked by profound fatigue that worsens after physical or mental exertion, unrefreshing sleep and often brain fog or dizziness on standing. It is diagnosed after other causes have been considered and needs careful, paced care.