Provider listening to a patient describe fatigue symptoms at Florida Keys Primary Care in Big Pine Key, FL

Fatigue and Low Energy in Big Pine Key, FL: Medical Evaluation for a Life with More Energy

Comprehensive fatigue workup and treatment from Dr. Gregory Keifer, D.O. and Tabble Memoli, MSN, APRN — serving the Middle and Lower Keys for 40 years.

Common In:Adults of all ages, especially women 35+
Often Treatable:Hormones, thyroid, and labs reveal the cause
Whole-Person Workup:Sleep, stress, mood, and labs all evaluated
Multiple Tools:HRT, supplements, TMS, and lifestyle support
Patient and provider reviewing fatigue workup labs in Big Pine Key, FL
Overview

Understanding Fatigue and Low Energy

When tired is not just tired — and there is a real plan to feel better

Fatigue and low energy care at Florida Keys Primary Care & Wellness in Big Pine Key, FL begins with one simple promise: we take fatigue seriously. If you have been told "everything looks normal" but you still feel exhausted by 2 PM, dragged out by mid-week, or unable to do the things you used to enjoy, you are not imagining it. Persistent fatigue is one of the most common — and most under-investigated — symptoms in primary care.

Fatigue is not a diagnosis. It is a signal. The job is to figure out what is sending the signal: thyroid, hormones, blood sugar, vitamin or iron deficiency, sleep apnea, depression, chronic infection, or — very commonly — some combination. Our team uses your full annual physical exam, targeted lab work, and an honest conversation about sleep, mood, and stress to find the actual driver.

Once we know the cause, we have real tools. Hormone replacement therapy for perimenopausal patterns. Targeted supplements for nutrient deficiencies. TMS therapy with Exomind for cognitive fatigue tied to depression. Chronic disease management for thyroid or metabolic causes. We pick the right tools for your reason — not a generic protocol.

Common medical and lifestyle causes of persistent fatigue
Causes

What's Behind Persistent Fatigue

Fatigue rarely has a single cause. It is usually a combination — and the workup is built to catch each piece. Common medical causes include thyroid dysfunction, anemia and iron deficiency, vitamin D and B12 deficiency, hormonal shifts (perimenopause, low testosterone), poorly controlled blood sugar, sleep apnea, depression and anxiety, chronic infections, and certain medications.

Fatigue often travels with related concerns we treat — including thyroid disorders, hormonal imbalance, unexplained weight gain, and brain fog. The AAFP fatigue evaluation guidelines recommend a structured workup that we follow closely: history, physical exam, basic labs, and targeted testing based on what those results reveal.

Comprehensive lab panel for fatigue evaluation
Learn More

Our Fatigue Workup and Treatment Options

The fatigue workup we use covers the highest-yield medical causes. Standard labs include CBC (anemia), ferritin and iron studies, TSH and free T4 (thyroid), comprehensive metabolic panel (kidney, liver, electrolytes, glucose), vitamin D, vitamin B12, and — based on your history — A1C, sex hormones, cortisol, and inflammatory markers. We also screen for depression, anxiety, and sleep quality, since each of these can cause fatigue independently or alongside medical causes. This workup is part of our comprehensive health screening.

Treatment depends entirely on what the workup shows. Iron deficiency is corrected with iron supplementation. Vitamin D and B12 deficiency are addressed with targeted supplementation through our supplement program. Thyroid disorders are treated with levothyroxine. Perimenopausal fatigue often responds well to hormone replacement therapy. For patients whose fatigue is rooted in depression or treatment-resistant low mood, TMS therapy with Exomind offers an evidence-based, drug-free option. Sleep apnea is referred for a sleep study and CPAP if confirmed.

The point: fatigue is rarely "just stress" or "just getting older." There is almost always something measurable, and almost always a real path forward.

Causes

What Causes Persistent Fatigue?

Hormonal

Perimenopause, menopause, low testosterone, and adrenal patterns all reduce energy.

Thyroid and Metabolic

Hypothyroidism, pre-diabetes, and unstable blood sugar are major energy drains.

Nutritional

Iron deficiency, low vitamin D, and B12 deficiency are common, easily missed, and easily treated.

Lifestyle

Sleep disruption, sleep apnea, chronic stress, alcohol, and reduced activity feed each other.

Mood and Mental Health

Depression and anxiety frequently present primarily as fatigue and brain fog.

Why Choose Florida Keys Primary Care for Fatigue Care
Why Us

Why Choose Florida Keys Primary Care for Fatigue Care

  • Physician Oversight
  • 40 Years of Continuity
  • Lab-Guided Workup
  • Multiple Treatment Tools
  • We Listen

Your Fatigue CarePath at Florida Keys Primary Care

Service Best For Visit Frequency What's Included Goal
Annual Physical Exams First step — full workup with vitals and labs Once per year (or sooner) Thyroid, anemia, vitamins, blood sugar, hormones, mood screening Identify the cause of fatigue
Chronic Disease Management Fatigue tied to thyroid, diabetes, or other chronic conditions Every 3-6 months Targeted medication management, lab tracking, symptom review Stabilize the underlying condition
Hormone Replacement Therapy Perimenopausal or hormone-driven fatigue Every 3-6 months Lab-guided HRT, symptom monitoring, energy assessment Restore hormonal balance and energy
Supplements Nutritional deficiencies (iron, B12, vitamin D) Initial visit + 3-month recheck Targeted supplementation, retest labs to confirm correction Correct deficiencies
TMS Therapy with Exomind Fatigue tied to depression or treatment-resistant low mood Daily sessions for 4-6 weeks Drug-free magnetic stimulation therapy Improve mood and energy
Signs You Should Have Your Fatigue Evaluated
Is This You?

Signs You Should Have Your Fatigue Evaluated

  • Tired After 8 Hours of Sleep
  • Energy Crashes by Mid-Afternoon
  • Fatigue Plus Weight or Mood Changes
  • It Has Been Weeks or Months
  • Family History of Anemia or Thyroid
  • Hair, Skin, or Nail Changes
FAQ

Frequently Asked Questions About Fatigue

What causes fatigue?

Most persistent fatigue has a medical or lifestyle cause we can identify. The most common are thyroid dysfunction, anemia or iron deficiency, vitamin D or B12 deficiency, hormonal shifts (perimenopause, low testosterone), uncontrolled blood sugar, sleep apnea, depression, and chronic stress. A thorough workup catches most of these.

Can hormones cause fatigue?

Yes — significantly. Perimenopause and menopause commonly cause fatigue from estrogen decline and disrupted sleep. Low testosterone in men similarly reduces energy. Adrenal patterns and thyroid imbalance both impact energy directly. Hormone replacement therapy, when appropriate, often restores energy substantially.

What blood tests check for tiredness?

We typically order CBC (anemia), ferritin (iron stores), TSH and free T4 (thyroid), comprehensive metabolic panel, vitamin D, vitamin B12, and A1C (blood sugar). Based on history, we add sex hormones, cortisol, and inflammatory markers. About 70% of fatigue causes show up on this panel.

When is fatigue a serious symptom?

Fatigue lasting more than 4 weeks deserves evaluation. Red flags that warrant prompt attention include unintentional weight loss, fevers, night sweats, severe shortness of breath, chest pain, or fatigue that prevents you from functioning. Acute fatigue with these features should not wait for a routine visit.

Can supplements help with fatigue?

Only if you have a genuine deficiency. Iron, vitamin D, and B12 supplementation can dramatically improve energy when those levels are low. Random supplementation without lab testing rarely helps and sometimes wastes money. We test first, then supplement specifically.

What is the difference between needing more sleep and being chronically fatigued?

If your energy returns after a few good nights of sleep, you simply need more sleep. If you sleep 7-9 hours nightly and still feel exhausted, that is medical fatigue — and it deserves a workup. Sleep apnea is a particularly common reason for that pattern.

Location29980 Overseas Hwy
Big Pine Key, FL 33043
Emailoffice@flkeyswellness.com
Phone(305) 872-3321
Ready to Start?

Schedule Your Consultation

Scientific References

  1. PubMed (PMID: 35704801) - Maisel P, et al. Fatigue as the Chief Complaint: Epidemiology, Causes, Diagnosis, and Treatment. Dtsch Arztebl Int. 2021.
  2. PubMed (PMID: 18452283) - Rosenthal TC, et al. Fatigue: An Overview. Am Fam Physician. 2008.
  3. PubMed (PMID: 33838997) - Sandler CX, Lloyd AR. Chronic fatigue syndrome: progress and possibilities. Med J Aust. 2020.