Root Causes of Chronic Fatigue: Why You’re Always Tired and How Functional Medicine Can Help
Functional Medicine • Primary Care • Spring, TX Near The Woodlands & Conroe
Root Causes of Chronic Fatigue: Why You’re Always Tired
Do you wake up exhausted even after a full night of sleep? Chronic fatigue is one of the most common reasons patients seek medical care, but the cause is often deeper than “being busy.” Fatigue may be related to poor sleep, sleep apnea, thyroid disease, anemia, vitamin deficiencies, depression, anxiety, chronic stress, inflammation, metabolic problems, medication side effects, or chronic medical conditions.
What Is Chronic Fatigue?
Chronic fatigue is more than feeling tired after a long day. It is persistent physical or mental exhaustion that does not fully improve with normal rest and may interfere with work, exercise, mood, concentration, relationships, and daily responsibilities.
MedlinePlus lists many possible medical causes of fatigue, including anemia, depression, sleep disorders, thyroid disease, medications, persistent pain, infections, and chronic illness.1 The CDC describes myalgic encephalomyelitis/chronic fatigue syndrome, also called ME/CFS, as a biological illness that can cause severe fatigue not improved by rest, unrefreshing sleep, problems with thinking, dizziness, pain, and post-exertional worsening of symptoms.2
At Vitality Medical Clinic in Spring, TX, we evaluate fatigue through an integrated primary care and functional medicine approach to help identify treatable contributors instead of only labeling the symptom.
Common Symptoms That May Come With Chronic Fatigue
Fatigue can look different from person to person. Some patients feel sleepy all day, while others feel physically drained, mentally foggy, weak, unmotivated, or unable to recover after normal activity.
- Waking up tired despite sleeping enough hours
- Brain fog, poor concentration, or memory problems
- Low motivation, reduced exercise tolerance, or muscle weakness
- Morning headaches, snoring, or non-restorative sleep
- Dizziness, lightheadedness, palpitations, or shortness of breath
- Weight gain, cold intolerance, hair thinning, constipation, or dry skin
- Low mood, anxiety, irritability, or loss of interest
- Fatigue after meals, sugar crashes, or symptoms of insulin resistance
- Pain, body aches, inflammation, or prolonged recovery after activity
1. Poor Sleep Quality and Sleep Apnea
Many patients spend enough time in bed but still do not get restorative sleep. Insomnia, irregular sleep schedules, restless legs, alcohol use, nighttime reflux, and obstructive sleep apnea can all cause persistent fatigue.
The National Heart, Lung, and Blood Institute notes that sleep apnea can cause breathing to stop and restart during sleep, preventing adequate oxygen and leading to poor sleep quality and excessive daytime sleepiness.3
2. Thyroid and Hormone Imbalances
Thyroid dysfunction, low testosterone, perimenopause, menopause, insulin resistance, and other hormone changes can affect energy, metabolism, mood, sleep, weight, and motivation.
The National Institute of Diabetes and Digestive and Kidney Diseases lists fatigue, weight gain, cold intolerance, muscle and joint pain, dry skin, hair thinning, constipation, and depression among common symptoms of hypothyroidism.4
3. Anemia, Low Iron, B12, Vitamin D, and Nutrient Deficiencies
Nutrient deficiencies may cause fatigue, weakness, dizziness, shortness of breath, poor exercise tolerance, hair shedding, neuropathy symptoms, or brain fog.
MedlinePlus lists anemia and iron deficiency as possible causes of fatigue.1 The NIH Office of Dietary Supplements notes that vitamin B12 deficiency can cause fatigue, neurological changes, anemia, palpitations, and low blood counts.5
4. Chronic Stress, Burnout, and Nervous System Overload
Long-term stress can affect sleep, mood, appetite, hormones, blood pressure, digestion, immune function, and inflammation. Over time, stress may contribute to exhaustion, irritability, brain fog, and reduced resilience.
A root-cause fatigue evaluation should review work stress, caregiver stress, trauma history, sleep schedule, alcohol use, caffeine use, exercise tolerance, and recovery patterns.
5. Depression and Anxiety
Mental health conditions often show up physically. Fatigue, low motivation, poor concentration, sleep changes, appetite changes, body aches, and reduced interest in normal activities may be related to depression or anxiety.
Because Vitality Medical Clinic offers both primary care and psychiatry services, we can evaluate both medical and mental health contributors to fatigue in one integrated care setting.
6. Prediabetes, Diabetes, Obesity, and Metabolic Problems
Prediabetes, diabetes, obesity, metabolic syndrome, and blood sugar instability can make the body less efficient at producing and using energy. Fatigue after meals, sugar cravings, abdominal weight gain, frequent urination, thirst, and blurry vision may suggest a metabolic contributor.
The American Diabetes Association lists extreme fatigue as one of the warning symptoms of diabetes, along with increased thirst, frequent urination, blurry vision, slow-healing cuts, and numbness or tingling in the hands or feet.6
7. Chronic Inflammation, Autoimmune Disease, Long COVID, and ME/CFS
Autoimmune conditions, chronic infections, post-viral syndromes, long COVID, inflammatory disorders, gut dysfunction, and ME/CFS can all contribute to fatigue. A careful history helps determine whether fatigue worsens after exertion, comes with pain, dizziness, recurrent illness, joint swelling, fevers, rashes, or neurologic symptoms.
The CDC notes that ME/CFS may include severe fatigue not improved by rest, unrefreshing sleep, cognitive symptoms, dizziness, and pain.2
8. Medication Side Effects and Substance Use
Some medications may cause tiredness, brain fog, dizziness, low motivation, or poor sleep quality. Sedating medications, some antidepressants, antihistamines, blood pressure medications, muscle relaxers, pain medications, alcohol, and certain supplements can contribute to fatigue.
A medication and supplement review is an important part of a chronic fatigue evaluation.
How Functional Medicine Looks at Chronic Fatigue
Functional medicine focuses on identifying why symptoms are happening. For chronic fatigue, this may include evaluating thyroid health, hormones, nutritional status, inflammation, blood sugar, gut health, sleep quality, stress, medication side effects, lifestyle patterns, and chronic disease risk.
At Vitality Medical Clinic, care is led by Dr. Jamal Mohsin, MD, with an integrated approach combining traditional primary care, preventive medicine, psychiatry, lifestyle medicine, and functional medicine principles.
Learn more about our Functional Medicine services in Spring, TX near The Woodlands and Conroe.
What Labs or Testing May Be Considered for Fatigue?
Testing depends on your symptoms, medical history, exam, medications, and risk factors. There is no single “fatigue panel” that fits everyone, but a comprehensive evaluation may include:
- CBC to evaluate anemia, infection, and blood cell abnormalities
- Comprehensive metabolic panel to review kidney, liver, electrolytes, and glucose
- Thyroid testing such as TSH and free T4 when appropriate
- Iron studies, ferritin, vitamin B12, folate, and vitamin D when clinically indicated
- A1c, fasting glucose, insulin resistance, and metabolic risk assessment
- Inflammation or autoimmune markers when symptoms suggest inflammatory disease
- Hormone evaluation when symptoms suggest testosterone, menopause, or endocrine concerns
- Sleep apnea screening or sleep study referral when snoring, witnessed apneas, or daytime sleepiness are present
The goal is to match testing to your clinical picture so treatment is targeted, evidence-informed, and personalized.
When to See a Doctor for Fatigue
You should schedule a primary care evaluation if fatigue lasts more than several weeks, interferes with daily life, or occurs with new or worsening symptoms.
A comprehensive Primary Care evaluation in Spring, TX can help identify common medical causes and determine whether additional testing, treatment, or specialty referral is needed.
Chronic Fatigue Doctor Near The Woodlands, Spring, and Conroe, TX
If you are searching for a chronic fatigue doctor near me, functional medicine doctor in Spring TX, fatigue evaluation near The Woodlands, or root-cause fatigue doctor near Conroe, Vitality Medical Clinic is conveniently located at:
2219 Sawdust Rd, Suite 302
Spring, TX 77380
Phone: (832) 245-9892
We serve patients from Spring, The Woodlands, Conroe, Magnolia, Tomball, Shenandoah, Oak Ridge North, Klein, Montgomery County, and North Houston. Our office provides integrated primary care, functional medicine, preventive care, metabolic health support, and psychiatry services under one roof.
Visit our Contact Vitality Medical Clinic page for directions, office information, and scheduling options.
Chronic Fatigue FAQs
What doctor should I see if I am always tired?
A primary care physician is usually the best starting point because fatigue can come from many medical causes, including anemia, thyroid disease, sleep apnea, diabetes, medication side effects, depression, anxiety, chronic inflammation, and nutritional deficiencies. Functional medicine may add a deeper root-cause review of sleep, stress, hormones, metabolism, nutrition, gut health, and lifestyle.
Can thyroid problems cause chronic fatigue?
Yes. Hypothyroidism can cause fatigue, weight gain, cold intolerance, constipation, dry skin, hair thinning, muscle or joint pain, and depression. Thyroid testing may be appropriate when symptoms suggest an endocrine cause.
Can sleep apnea make me tired even if I sleep 8 hours?
Yes. Sleep apnea can repeatedly interrupt breathing and sleep quality. Patients may sleep for many hours but still wake up unrefreshed or feel sleepy during the day. Snoring, witnessed pauses in breathing, morning headaches, high blood pressure, and daytime sleepiness are common clues.
What labs are commonly checked for fatigue?
Labs vary by patient, but common testing may include CBC, metabolic panel, thyroid tests, A1c, iron studies, ferritin, vitamin B12, folate, vitamin D, inflammatory markers, and hormone testing when clinically appropriate.
Do you offer chronic fatigue evaluations near The Woodlands and Conroe?
Yes. Vitality Medical Clinic is located in Spring, TX, near The Woodlands and Conroe. We provide primary care and functional medicine evaluations for fatigue, low energy, brain fog, sleep problems, metabolic issues, hormone concerns, and chronic symptoms.
Medical References
- MedlinePlus Medical Encyclopedia. Fatigue. https://medlineplus.gov/ency/article/003088.htm
- Centers for Disease Control and Prevention. ME/CFS Basics. https://www.cdc.gov/me-cfs/about/index.html
- National Heart, Lung, and Blood Institute. What Is Sleep Apnea? https://www.nhlbi.nih.gov/health/sleep-apnea
- National Institute of Diabetes and Digestive and Kidney Diseases. Hypothyroidism. https://www.niddk.nih.gov/health-information/endocrine-diseases/hypothyroidism
- NIH Office of Dietary Supplements. Vitamin B12 Fact Sheet for Health Professionals. https://ods.od.nih.gov/factsheets/VitaminB12-HealthProfessional/
- American Diabetes Association. Diabetes Symptoms & Warning Signs. https://diabetes.org/about-diabetes/warning-signs-symptoms
- Mayo Clinic. Fatigue Causes. https://www.mayoclinic.org/symptoms/fatigue/basics/causes/sym-20050894
Get to the Root Cause of Your Fatigue
Vitality Medical Clinic serves patients in Spring, The Woodlands, Conroe, Magnolia, Tomball, Klein, and North Houston with integrated primary care and functional medicine. If you are always tired, brain foggy, low energy, or not recovering like you used to, schedule a fatigue evaluation with Dr. Jamal Mohsin.
