How can you differentiate between fatigue and depression, and what role does testosterone play?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Fatigue is a persistent feeling of tiredness that can accompany many medical conditions. Depression, however, is a mood disorder that causes not only tiredness but also ongoing sadness and loss of interest in daily activities. Testosterone, a hormone present in higher levels in men, plays a key role in regulating mood and energy. Low testosterone levels have been linked to symptoms of depression, not just general fatigue, making it important to distinguish between the two.

Because fatigue, depression, and hormone-related symptoms often overlap, it can be difficult to know exactly what's causing how you feel. Taking a free, instant, online symptom check can help you clarify your symptoms, identify possible causes, and guide your next steps—whether that means lifestyle changes, lab testing, or speaking with a doctor. It's a quick, private way to gain clarity and take control of your health today.

Reviewed for medical accuracy: 07/14/2026

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Explanation

When looking at fatigue versus depression, think of fatigue as a state of weariness that may occur after physical exertion or long work, while depression includes a deep sadness, lack of interest in activities, and feelings of worthlessness or hopelessness. In depression, people might feel tired but also experience a heavy burden on their feelings and thoughts.

Research from the studies shows that testosterone has a role in mood and well-being. For example, some men with low testosterone may feel more depressed and less energetic. However, not everyone with low testosterone will have depression, and not everyone who feels fatigued is depressed. Doctors look at other signs, like changes in sleep, appetite, and everyday enjoyment. If you're experiencing persistent fatigue or mood changes, consider using a free symptom checker to help identify potential causes and determine whether you should speak with a healthcare provider.

Overall, while testosterone levels can influence mood, they are just one part of the larger picture of mental and physical health.

(References)

Määttänen I, Gluschkoff K, Komulainen K, Airaksinen J, Savelieva K, García-Velázquez R, Jokela M. Testosterone and specific symptoms of depression: Evidence from NHANES 2011-2016. Compr Psychoneuroendocrinol. 2021 Mar 10;6:100044. doi: 10.1016/j.cpnec.2021.100044. PMID: 35757365; PMCID: PMC9216439.
Spitzer M, Basaria S, Travison TG, Davda MN, DeRogatis L, Bhasin S. The effect of testosterone on mood and well-being in men with erectile dysfunction in a randomized, placebo-controlled trial. Andrology. 2013 May;1(3):475-82. doi: 10.1111/j.2047-2927.2013.00075.x. Epub 2013 Mar 15. PMID: 23494931; PMCID: PMC3630276.
Kheirkhah F, Hosseini SR, Hosseini SF, Ghasemi N, Bijani A, G Cumming R. Relationship between testosterone levels and depressive symptoms in older men in Amirkola, Iran. Caspian J Intern Med. 2014 Spring;5(2):65-70. PMID: 24778779; PMCID: PMC3992230.

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