Feeling exhausted despite getting enough sleep is one of the most common complaints that patients bring to their doctor. If you constantly ask yourself “why am I always tired?”, you are not alone. Persistent fatigue affects approximately 38% of U.S. workers, according to the National Safety Council, and it often signals an underlying medical condition that deserves attention.
Tired of feeling tired? Schedule a fatigue evaluation with Dr. Ghadimi at NuGen Medicine.
At NuGen Medicine, Dr. Nima Ghadimi, board-certified internist with over 20 years of clinical experience, takes chronic fatigue seriously. Rather than dismissing it as a lifestyle issue, he investigates the root causes using comprehensive lab testing, hormone panels, and functional medicine approaches. This guide covers the most common medical reasons for constant tiredness and when to see a doctor.
Common Medical Causes of Constant Fatigue
Chronic fatigue is rarely caused by a single factor. Most patients who feel tired all the time have one or more underlying conditions contributing to their exhaustion. Here are the most common medical causes that Dr. Ghadimi evaluates during a comprehensive fatigue workup.
Thyroid Disorders
An underactive thyroid (hypothyroidism) is one of the leading medical causes of persistent tiredness, particularly in women over 40. The thyroid gland regulates metabolism, and when it produces insufficient hormones, everything slows down. Symptoms include fatigue, weight gain, cold intolerance, dry skin, and brain fog. The American Thyroid Association estimates that 20 million Americans have some form of thyroid disease, and up to 60% are unaware of their condition. A simple blood test measuring TSH and free T4 levels can identify thyroid dysfunction.
Hormone Imbalances
Declining hormone levels are a frequently overlooked cause of fatigue in both men and women. Low testosterone in men can cause crushing tiredness, reduced motivation, and difficulty concentrating. In women, estrogen and progesterone fluctuations during perimenopause and menopause commonly trigger fatigue, sleep disruption, and mood changes. NuGen Medicine offers comprehensive hormone lab testing and hormone replacement therapy to address these imbalances.
Iron Deficiency and Anemia
Iron deficiency is the most common nutritional deficiency worldwide and a major cause of fatigue, especially in women of reproductive age. When your body lacks sufficient iron, it cannot produce enough hemoglobin to carry oxygen to your tissues efficiently. This results in persistent tiredness, weakness, shortness of breath, and pale skin. A complete blood count (CBC) and iron studies can diagnose this condition, which is treatable with supplementation or dietary changes.
Vitamin D Deficiency
Research published in the Journal of Clinical Sleep Medicine has linked low vitamin D levels to excessive daytime sleepiness and fatigue. Despite living in sunny Arizona, many patients at our Scottsdale clinic still test low for vitamin D due to sunscreen use and indoor lifestyles. Supplementation often produces noticeable improvement in energy levels within a few weeks.
Sleep Disorders
Conditions like sleep apnea can cause severe daytime fatigue even when you believe you are sleeping enough. Obstructive sleep apnea affects an estimated 22 million Americans and causes repeated breathing interruptions during sleep, preventing restorative deep sleep. If you snore loudly, wake up with headaches, or feel unrefreshed despite 7-8 hours of sleep, a sleep evaluation may be warranted.
Depression and Anxiety
Mental health conditions are closely linked to physical exhaustion. Depression can cause persistent fatigue, difficulty getting out of bed, and a feeling of heaviness that sleep does not relieve. Anxiety can lead to both mental exhaustion and disrupted sleep. NuGen Medicine offers integrated mental health support, including ketamine therapy for treatment-resistant depression and ADHD evaluation for adults who may have undiagnosed attention disorders contributing to fatigue.
Do not ignore chronic fatigue. Book a comprehensive evaluation at NuGen Medicine today.
Lifestyle Factors That Contribute to Tiredness
While medical conditions are the most important causes to rule out, lifestyle factors often amplify fatigue or serve as the primary culprit. Common contributors include:
- Poor diet and blood sugar instability: Diets high in refined carbohydrates and sugar cause blood sugar spikes and crashes that leave you feeling drained. A balanced diet with adequate protein, healthy fats, and complex carbohydrates provides more stable energy throughout the day.
- Dehydration: Even mild dehydration (1-2% of body weight) can significantly impair energy levels and cognitive function. Most adults need at least 8 cups of water daily, more if exercising or living in a dry climate like Arizona.
- Sedentary lifestyle: Paradoxically, physical inactivity increases fatigue. Regular moderate exercise has been shown to reduce fatigue by up to 65% in sedentary adults, according to a study from the University of Georgia.
- Chronic stress: Sustained stress elevates cortisol levels, which disrupts sleep, impairs recovery, and depletes energy reserves over time. Stress management through mindfulness, exercise, and professional support can break this cycle.
- Caffeine overconsumption: While caffeine provides a temporary energy boost, excessive intake (especially after noon) disrupts sleep architecture and creates a cycle of dependence and fatigue.
When to See a Doctor About Fatigue
Not all tiredness requires a doctor visit. However, you should schedule an appointment if you experience any of the following:
- Fatigue that persists for more than two weeks despite adequate sleep and rest
- Tiredness that interferes with your daily activities, work, or relationships
- Unexplained weight changes alongside fatigue
- Feelings of sadness, hopelessness, or loss of interest in activities you normally enjoy
- New or worsening symptoms such as joint pain, muscle weakness, or frequent infections
- Fatigue accompanied by fever, night sweats, or unexplained bruising
At NuGen Medicine, Dr. Ghadimi conducts a thorough evaluation that includes a detailed medical history, physical examination, and targeted laboratory testing. This often includes a comprehensive metabolic panel, complete blood count, thyroid panel, vitamin D, B12, iron studies, and hormone levels. Learn more about Dr. Ghadimi’s approach on our Meet Our Providers page.
How NuGen Medicine Investigates Chronic Fatigue
Most patients who come to NuGen Medicine with fatigue have already been told by other doctors that their labs are “normal” or to “just get more sleep.” Dr. Ghadimi takes a different approach by looking at the whole picture and using optimal ranges, not just standard reference ranges, to evaluate lab results.
Our fatigue evaluation typically includes:
- Comprehensive lab panel: TSH, free T3, free T4, reverse T3, ferritin, iron, TIBC, vitamin D, B12, folate, CMP, CBC, CRP, and fasting insulin
- Hormone assessment: Testosterone (total and free), estradiol, progesterone, DHEA-S, and cortisol for both men and women
- Functional medicine testing: Additional tests may include food sensitivity panels, gut health assessments, and micronutrient testing through our functional lab testing program
- Sleep and stress evaluation: Assessment of sleep quality, stress levels, and mental health screening
Once the root cause is identified, treatment may include hormone optimization through hormone replacement therapy, nutritional supplementation, lifestyle modifications, or referral for conditions like sleep apnea. For men experiencing fatigue related to low testosterone, our testosterone therapy program addresses the underlying hormonal imbalance.
NuGen Medicine offers both in-person visits at our Scottsdale clinic (5111 N Scottsdale Rd #143, Scottsdale, AZ 85250) and telemedicine appointments for patients in Arizona, California, Florida, and Colorado.
Stop guessing why you are tired. Get answers with a comprehensive fatigue workup at NuGen Medicine.
Frequently Asked Questions About Chronic Fatigue
Why am I always tired even though I sleep enough?
Sleeping enough hours does not guarantee restorative sleep. Conditions like sleep apnea, hormone imbalances, thyroid disorders, vitamin deficiencies, and depression can all cause persistent fatigue despite adequate sleep duration. A medical evaluation with targeted lab work can identify the specific cause.
Why am I always tired and have no energy as a woman?
Women are disproportionately affected by fatigue-causing conditions including iron deficiency anemia, thyroid disorders, and hormonal fluctuations during perimenopause and menopause. Estrogen and progesterone changes directly affect energy levels, sleep quality, and mood. Comprehensive hormone testing can reveal whether hormonal imbalance is contributing to your exhaustion.
Can hormone imbalances cause extreme fatigue?
Yes. Low testosterone in men and declining estrogen and progesterone in women are among the most common and treatable causes of chronic fatigue. Hormone replacement therapy, when prescribed and monitored by a physician, can significantly restore energy levels within weeks of starting treatment.
What blood tests should I ask for if I am always tired?
At minimum, request a CBC, comprehensive metabolic panel, TSH, free T4, vitamin D, B12, ferritin, and iron studies. For a more thorough evaluation, ask for free T3, reverse T3, testosterone (total and free), DHEA-S, fasting insulin, and CRP. NuGen Medicine routinely orders comprehensive panels that go beyond standard screening.
When should I worry about being tired all the time?
Seek medical attention if fatigue lasts more than two weeks, interferes with daily activities, is accompanied by unexplained weight changes, or occurs with symptoms like fever, night sweats, or persistent pain. These could indicate conditions that require prompt evaluation and treatment.
Does NuGen Medicine offer telemedicine for fatigue evaluation?
Yes. NuGen Medicine offers telemedicine appointments for patients in Arizona, California, Florida, and Colorado. Dr. Ghadimi can order lab work through local facilities and review results via a virtual visit, making it convenient to begin your fatigue evaluation from home.
Disclaimer: This article is for informational purposes only and does not constitute medical advice. Chronic fatigue can have many causes, some of which require medical evaluation. Consult your physician for a proper diagnosis and treatment plan.