Why Am I So Tired All the Time? Exploring the Most Common Causes-

Exhaustion and your health can take a serious toll on your body, mind and soul.

Why am I so tired all the time? The Most Googled Question of 2025

Feeling tired occasionally is normal. Feeling exhausted every single day, regardless of how much you sleep, is not. In fact, “Why am I so tired all the time?” remains one of the most Googled health questions in the United States, especially among adults juggling careers, families, long commutes, chronic stress, and rising metabolic and hormonal issues (Google Trends, 2024).

At Phoenix Medical Group of Florida, chronic fatigue is one of the most common symptoms patients report—and one of the most misunderstood. Many patients spend years searching for answers while being told their labs are “normal,” even when they know something isn’t right.

This comprehensive guide explains why fatigue is so widespread, the most common medical causes, and how Phoenix Medical Group uses modern telehealth, advanced diagnostics, and personalized treatment plans to help patients finally reclaim their energy.

The Modern Fatigue Epidemic

We live in a society where exhaustion has become the norm. According to the CDC, over one-third of U.S. adults do not get enough sleep, and fatigue is one of the top symptoms reported in primary care visits (CDC, 2023). When combined with nutrient deficiencies, hormonal dysregulation, and long-term stress, persistent fatigue becomes not just a symptom—but a warning sign from the body.

Today’s lifestyle creates the “perfect storm” for exhaustion:

• Longer work hours

• Screen-time overload

• High stress and burnout

• Irregular sleep

• Sedentary habits

• Insufficient nutrition

• Weight gain and metabolic issues

• Hormone imbalances

This is why Phoenix Medical Group takes a root-cause approach, offering targeted labs, telehealth accessibility, and customized treatment plans to help patients uncover what’s really going on.

Top Medical Causes of Fatigue

Below are the most common medical contributors to chronic fatigue, supported by research and frequently diagnosed in our Florida patient population.

1. Hormone Imbalances

Hormones regulate metabolism, mood, sleep, and energy. When even one hormone is out of balance, fatigue often follows quickly. Low testosterone, low progesterone, estrogen fluctuations, and adrenal dysfunction are prevalent.

Perimenopause begins in women in their late 30s to early 40s and is often overlooked as a normal part of aging. Similarly, men experience andropause around the same age, marked by a decline in hormone levels and associated symptoms.

Low Testosterone (Men & Women)

Studies show that low testosterone is associated with fatigue, depression, decreased muscle mass, and reduced quality of life (Corona et al., 2014). Women also require testosterone for vitality, energy, bone density, lean muscle and sexual wellness.

Low Progesterone (Women)

Progesterone supports mood, sleep, and stress response. Low levels—especially during perimenopause—can cause exhaustion, anxiety, and insomnia (Prior, 2018).

Adrenal Dysfunction

Chronic stress impacts cortisol production, leading to the feeling of being “tired but wired.” Research shows that dysregulated cortisol patterns are strongly linked to chronic fatigue (Johannson et al., 2022).

2. Thyroid Dysfunction

Thyroid issues—especially hypothyroidism—are a leading cause of fatigue. Even mild thyroid hormone changes can impair energy production. Research shows that up to 60% of people with thyroid disease are undiagnosed (American Thyroid Association, 2022).

Symptoms include:

• Weight gain

• Brain fog

• Cold sensitivity

• Slowed metabolism

• Heavy or irregular menstrual cycles

• Fatigue,

• Dry skin

• Puffy face

• Muscle weakness or joint pain

3. Vitamin & Nutrient Deficiencies

Vitamin deficiencies are shockingly common and play a major role in fatigue. Essential vitamins just to name a few, include B12, D, and iron, are crucial for energy production and overall health. When the body lacks these nutrients, it can lead to feelings of exhaustion and decreased vitality. Addressing these deficiencies through diet or supplementation can significantly improve energy levels and overall well-being.

Vitamin D Deficiency

More than 40% of U.S. adults have low vitamin D, which is linked to fatigue, mood changes, immune dysfunction, and hormone imbalance (Forrest & Stuhldreher, 2011).

Vitamin B12 Deficiency

B12 supports red blood cell production and neurological function. Deficiency causes severe fatigue, dizziness, and memory issues (O’Leary & Samman, 2010).

Iron Deficiency

Iron deficiency—especially in women—is one of the most common nutrient-related causes of fatigue worldwide (Camaschella, 2015).

Vital nutrients fuel energy-low levels may lead to persistent fatigue

4. Poor Metabolic Health

Recent data confirms that metabolic dysfunction, particularly insulin resistance and prediabetes, is a significant public health challenge in the U.S. A 2022 review indicated that over 50% of U.S. adults experience insulin resistance, heightening the risk of type 2 diabetes and cardiovascular diseases (ADA, 2022). - A 2023 study highlighted that lifestyle interventions can reduce insulin resistance prevalence by up to 30% in high-risk groups (Diabetes Care, 2023).

Symptoms include:

• Increased hunger or appetite

• Difficulty concentrating

• Sleep disturbances or insomnia

• High blood pressure

• Fatigue after meals

• Skin changes, such as dark patches or acanthosis nigricans

• Elevated triglycerides or cholesterol levels

• Frequent urination

• Thirst or dry mouth

• Hormonal imbalances

5. Sleep Disorders

Sleep problems are one of the strongest predictors of chronic fatigue. Sleep apnea alone affects approximately 30 million Americans (AASM, 2022). Sleep disorders encompass a range of conditions that affect the ability to sleep well regularly. They can lead to significant health issues, including chronic fatigue, mood disturbances, and impaired cognitive function. Here are some common sleep disorders:

Sleep Apnea

Sleep apnea is characterized by repeated interruptions in breathing during sleep. It can lead to fragmented sleep and reduced oxygen supply to the body. Symptoms may include loud snoring, gasping for air during sleep, and excessive daytime sleepiness. It is estimated that approximately 30 million Americans are affected by sleep apnea (AASM, 2022).

Insomnia

Insomnia is the difficulty in falling asleep or staying asleep, leading to non-restorative sleep. It can be caused by stress, anxiety, medical conditions, or certain medications. Chronic insomnia can significantly impact daily functioning and overall health.

Restless Legs Syndrome (RLS)

RLS is a neurological disorder characterized by an uncontrollable urge to move the legs, usually due to uncomfortable sensations. Symptoms often worsen during periods of inactivity and can disrupt sleep, leading to fatigue and mood changes.

6. Chronic Stress & Mental Fatigue

Stress is not just an emotional issue—it is a biochemical one. Prolonged stress raises cortisol and adrenaline, eventually depleting the body. Persistent stress leads to fatigue, anxiety, weight gain, inflammation, and reduced immunity, causing significant harm to your body.

How Phoenix Medical Group Helps You Reclaim Your Energy

At Phoenix Medical Group, we are committed to providing attentive and thorough care to our patients. We understand that health issues can be complex, which is why we take the time to listen to your concerns and conduct detailed evaluations. Our modern, patient-first approach combines the latest medical advancements with a focus on your unique needs, aiming to identify the root causes of your fatigue rather than just treating the symptoms.

Your health is a continuous journey, and we strive to be your trusted partner along the way. We believe in building long-term relationships with our patients, allowing us to offer personalized care that adapts to your evolving needs. Whether managing a chronic condition or improving overall well-being, we provide guidance, support, and expert advice tailored to you.

Phoenix Medical Group Solution:

✔ Same-Day Telehealth Visits Anywhere in Florida

✔ Affordable lab bundles

✔ Advanced hormone lab panels

✔ Personalized hormone evaluation and treatment

✔ Comprehensive thyroid labs (TSH, Free T3/T4, antibodies, reverse T3)

✔ Individualized thyroid management

✔ Stress and adrenal support protocols

✔ Hormone and vitamin optimization programs

✔ GLP-1-based metabolic reset weight loss

✔ Stress management support

✔ No insurance hassles. No surprise bills.

Phoenix Medical Group restores energy, improving health and offers supportive care every step of the way.

When to Seek Medical Attention for Fatigue

Understanding when to reach out for medical help is essential for your well-being. If you are experiencing any of the following symptoms, it may be time to schedule a visit with a healthcare professional:

Signs You Shouldn't Ignore

• Fatigue Lasting More Than 2–3 Weeks: If you find yourself feeling unusually tired for an extended period, this could be a sign of an underlying health issue. Persistent fatigue is not normal and should be evaluated by a professional.

• Impact on Daily Activities: If your low energy levels are affecting your ability to perform daily tasks, it’s crucial to seek help. Don’t let fatigue hold you back from enjoying life and achieving your goals.

  
  

Why Choose Phoenix Medical Group?

At Phoenix Medical Group, we understand that fatigue can significantly impact your quality of life. Our dedicated team is here to help you uncover the reasons behind your fatigue and develop a personalized treatment plan that addresses your unique needs.

Take the First Step Towards Feeling Better

Don’t let fatigue dictate your life. If you’re experiencing prolonged tiredness or a lack of energy, it’s time to take action. Schedule a visit with us at Phoenix Medical Group today, and let us help you regain your vitality and improve your overall health.

References

American Academy of Sleep Medicine. (2022). Sleep apnea statistics and facts. AAS

American Thyroid Association. (2022). Thyroid disease facts. https://www.thyroid.org

Camaschella, C. (2015). Iron-deficiency anemia. New England Journal of Medicine, 372(19), 1832–1843

Centers for Disease Control and Prevention. (2023). Short sleep duration among U.S. adults. https://www.cdc.gov

Corona, G., Rastrelli, G., Morgentaler, A., Sforza, A., Mannucci, E., & Maggi, M. (2014). Meta-analysis of the effect of testosterone therapy on fatigue. Journal of Sexual Medicine, 11(6), 1577–1592.

Forrest, K. Y., & Stuhldreher, W. L. (2011). Prevalence and correlates of vitamin D deficiency in U.S. adults. Nutrition Research, 31(1), 48–54

Google Trends. (2024). Most searched health questions in the United States

Johannson, G., et al. (2022). Cortisol patterns and chronic fatigue. Journal of Clinical Endocrinology & Metabolism, 107(3), 820–829

McEwen, B. S., & Stellar, E. (1993). Stress and the individual: Mechanisms leading to disease. Archives of Internal Medicine, 153(9), 2093–210

O’Leary, F., & Samman, S. (2010). Vitamin B12 in health and disease. Nutrients, 2(3), 299–316.

Prior, J. C. (2018). Progesterone and women’s health: Hormone balance and fatigue. Endocrine Reviews, 39(3), 254–290

Saklayen, M. G. (2018). The global epidemic of metabolic syndrome. Current Hypertension Reports, 20(2), 12.