Feeling drained after a demanding week is normal. Work deadlines, family responsibilities, travel, late nights, and too little downtime can all leave you running on empty. But when low energy becomes the default rather than the exception, blaming a packed calendar can hide the real issue.
Fatigue isn’t a diagnosis. It is a symptom with a long list of possible causes, ranging from poor sleep and stress to anemia, thyroid problems, depression, sleep apnea, and hormone disorders. That overlap matters because two men can describe the same “low energy” while needing very different solutions.
The useful question, then, isn’t simply, “How can I get more energy?” It is, “What has changed, and what might be driving it?”
When Tiredness Stops Looking Normal
A few exhausted days after travel or a difficult project usually have an obvious explanation. Persistent fatigue is different. MedlinePlus notes that fatigue can be a normal response to physical activity, emotional stress, boredom, or lack of sleep, but it can also accompany medical conditions. If it doesn’t improve after several weeks, medical advice is reasonable.
Pay attention to the pattern. Are you waking up tired despite spending enough time in bed? Has your exercise tolerance fallen? Are you struggling to concentrate in the afternoon? Have libido, mood, strength, or body composition changed at the same time?
Hormones may be one part of that picture. Men who are concerned about compatible symptoms can test testosterone levels at home as an initial way to gather information without arranging a traditional laboratory visit. Some at-home services use professional blood collection rather than requiring people to collect their own samples. A result shouldn’t be treated as a stand-alone diagnosis, however. Professional interpretation and, when indicated, repeat testing are important.
Sleep Quality Matters More Than Time in Bed
Most adults need at least seven hours of sleep each night. Yet sleep remains a widespread issue. A 2026 National Center for Health Statistics report found that 30.5% of U.S. adults averaged less than seven hours of sleep in 24 hours in 2024.
Time in bed doesn’t always equal restorative sleep, either.
Obstructive sleep apnea is a good example. The condition repeatedly blocks or reduces airflow during sleep and can lead to daytime sleepiness, tiredness, and problems with concentration. Loud snoring, gasping, or breathing that stops and restarts are common clues. Men may not notice those nighttime signs themselves, so a partner is often the first person to raise the issue.
Alcohol can muddy the picture, too. It may help someone fall asleep faster, but the National Institute on Alcohol Abuse and Alcoholism notes that drinking can fragment sleep and contribute to earlier waking. A nightly drink that seems relaxing may therefore leave someone less refreshed the next day.
Before assuming work is the only reason for fatigue, look at sleep duration, sleep consistency, snoring, nighttime awakenings, and alcohol use.
Testosterone Is One Piece of the Puzzle
Low testosterone can be associated with symptoms that include reduced sexual desire and lower energy. The difficulty is that tiredness and other general symptoms aren’t specific to testosterone deficiency.
That is why expert guidance doesn’t recommend diagnosing hypogonadism from symptoms alone. The Endocrine Society advises making the diagnosis only when a man has relevant signs or symptoms alongside “unequivocally and consistently low” testosterone concentrations. It also recommends confirming a low result with a repeat morning fasting testosterone measurement.
Recent research reinforces the need for a measured approach. A 2026 prospective study involving 657 community-dwelling Swedish men found that low total testosterone was associated with a higher sexual symptom burden in cross-sectional analysis. However, testosterone levels measured at baseline weren’t associated with the men’s overall symptom scores about a decade later.
In other words, testosterone matters, but vague symptoms such as tiredness don’t reliably tell you what your hormone levels are. For someone with persistent fatigue plus symptoms such as reduced libido or changes in sexual function, discussing testing with a qualified clinician can be reasonable. The goal is to investigate, not to assume.
Other Medical Causes Are Worth Ruling Out
Several health conditions can sap energy.
Anemia reduces the body’s supply of oxygen-rich blood. The National Heart, Lung, and Blood Institute lists tiredness and weakness among its possible effects, along with shortness of breath, dizziness, headaches, and an irregular heartbeat. Anemia itself can also have numerous causes, so taking iron supplements without knowing why you are tired isn’t a substitute for an appropriate diagnosis.
An underactive thyroid can cause fatigue as well. The National Institute of Diabetes and Digestive and Kidney Diseases lists tiredness, weight gain, difficulty tolerating cold, muscle and joint pain, slowed heart rate, and depression among possible symptoms. Importantly, it also points out that symptoms such as fatigue and weight gain are common and don’t necessarily mean someone has a thyroid problem.
Mental health deserves equal attention. The National Institute of Mental Health includes fatigue, lack of energy, and feeling slowed down among the possible symptoms of depression. Men may also experience noticeable changes in mood, appetite, sleep, or energy.
Medications, infections, chronic illnesses, and other health problems can contribute, too. This is why unexplained fatigue is best approached as a symptom to investigate rather than a condition to self-diagnose.
Start With the Basics, but Track What Happens
Lifestyle changes will not fix every cause of fatigue, but they can provide useful information and support general health.
Try keeping a simple two-week record of:
- Sleep and wake times, including nighttime waking
- Energy levels at different points in the day
- Exercise and recovery
- Alcohol intake
- Mood and stress
- New symptoms, medications, or supplements
You don’t need a perfect routine. Look for patterns. A steady energy crash after several short nights tells a different story from fatigue that remains unchanged after adequate rest.
Regular movement supports health, too. Current U.S. guidance recommends at least 150 minutes of moderate-intensity aerobic activity each week, alongside muscle-strengthening activity on two days. Inactive people can start with smaller amounts and build up gradually.
If you feel unusually exhausted, however, using harder workouts to “push through” unexplained fatigue may miss the bigger question: why has your energy changed in the first place?
Know When to Get Checked
Persistent fatigue deserves attention when rest and routine changes aren’t helping. MedlinePlus advises contacting a healthcare provider when fatigue doesn’t improve after several weeks. Unexplained fatigue accompanied by other changes, such as fever, unintended weight loss, significant mood changes, or symptoms suggesting poor-quality sleep, also warrants medical assessment.
Bring specific observations to the appointment. “I’m tired all the time” is useful, but “I sleep eight hours, wake unrefreshed, snore loudly, and have been falling asleep at my desk for six weeks” gives a clinician much more to work with.
From there, a healthcare professional can decide whether your symptoms point toward sleep evaluation, blood tests, medication review, hormone testing, mental health support, or another line of investigation.
Conclusion
Low energy is easy to explain away when life is busy. Sometimes the explanation really is a run of late nights, stress, and too little recovery. But persistent fatigue can also point to sleep problems, mental health concerns, anemia, thyroid disease, low testosterone, or another underlying issue.
The most useful response is curiosity rather than self-diagnosis. Track what has changed, improve the basics you can control, and seek professional guidance when the pattern persists. Feeling tired is common. Living with unexplained exhaustion doesn’t have to become your new normal.
References
- Endocrine Society. Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline. 2018.
- National Center for Health Statistics, Centers for Disease Control and Prevention. Short Sleep Duration and Sleep Difficulties Among Adults: United States, 2024. Data Brief No. 559. 2026.
- National Heart, Lung, and Blood Institute. Sleep Apnea: Symptoms. Updated 2025.
- National Institute of Diabetes and Digestive and Kidney Diseases. Hypothyroidism (Underactive Thyroid).
- National Heart, Lung, and Blood Institute. Anemia: What Is Anemia?
- National Institute of Mental Health. Depression.
- National Institute on Alcohol Abuse and Alcoholism. Hangovers.
- Osmancevic A, Li Y, Ottarsdottir K, et al. “Testosterone Levels and Symptoms of Hypogonadism in Swedish Men: A Prospective Study From the Vara-Skövde Cohort.” Frontiers in Endocrinology. 2026.
- MedlinePlus. Fatigue. U.S. National Library of Medicine.
- Centers for Disease Control and Prevention. Adult Activity: An Overview.