Why the two are so hard to tell apart
Low mood, fatigue, low motivation, trouble concentrating, and low libido show up in both depression and low testosterone. In the European Male Ageing Study (3,369 men), depression and fatigue were among the symptoms related to testosterone level, but only weakly. The symptoms most closely tied to low testosterone were sexual: low desire, fewer morning erections, and erectile dysfunction. See which symptoms actually track with low T.
That means a man can have low testosterone and depression together, either one alone, or neither, and a symptom checklist can't tell them apart. A proper evaluation can. Our medical causes to rule out section lists low testosterone alongside thyroid problems, sleep apnea, and others, and the two-minute check-in can help you decide whether to bring it up.
What the link looks like
The best-known evidence is observational. In a 2004 study of 278 men aged 45 and older at a Veterans Affairs health system, none of whom had a depression diagnosis at the start, 21.7% of men with low testosterone (total testosterone of 200 ng/dL or less, or low free testosterone) received a depression diagnosis over two years, compared with 7.1% of the other men. After adjusting for age, race, alcohol use, prostate cancer, and other illness, low testosterone was associated with about four times the rate of a depression diagnosis (hazard ratio 4.2, 95% CI 1.5 to 12.0). The authors themselves called the findings preliminary.
The limits matter. This was a records study at a Veterans Affairs health system, so it can't show direction. Low testosterone might contribute to depression; depression, chronic stress, poor sleep, and excess weight can lower testosterone; or other factors might drive both. See stress and burnout and sleep and testosterone. A 2022 review of the research on testosterone and depression in ageing men likewise described the benefits of testosterone treatment for men with major depression and low testosterone as uncertain.
What treatment trials show
Three pieces of evidence matter most. All of them are about hormone treatment prescribed to men with measured testosterone levels, not about supplements or unmonitored "optimization."
The Testosterone Trials (men 65 and older)
This randomized trial enrolled 790 men aged 65 or older whose testosterone averaged under 275 ng/dL and who had symptoms suggesting low testosterone. Mood was measured in the Vitality Trial, which enrolled men reporting low energy, and men with severe depression (a PHQ-9 score of 20 or higher) were excluded. After a year of testosterone gel versus placebo, treated men scored slightly better: about 0.7 points lower on the 27-point PHQ-9 depression questionnaire (baseline average 6.6, in the mild range), and small improvements in positive and negative mood scales. The authors reported that every effect size was below 0.2, which researchers conventionally describe as small, and described the benefits as small but statistically significant.
TRAVERSE (men 45 to 80)
A depression analysis of the TRAVERSE trial included 5,204 men aged 45 to 80 with low testosterone, symptoms, and heart disease or high risk of it, treated with testosterone gel or placebo. About half (50.8%) had significant depressive symptoms (PHQ-9 above 4), and only 49 men (1.5%) met criteria for a low-grade, long-lasting depressive disorder (formerly called dysthymia). Testosterone was associated with modest but significantly greater improvements in mood and energy among men with depressive symptoms and among all men, but not with significant improvements in thinking or sleep quality. In the small group with the persistent depressive disorder, there was no significant difference, possibly because the group was too small to detect one.
A pooled analysis of 27 trials
A 2019 systematic review and meta-analysis in JAMA Psychiatry pooled 27 randomized, placebo-controlled trials with 1,890 men, both low-testosterone and normal-testosterone men, who were assessed with validated depression scales. Testosterone treatment was associated with a significant reduction in depressive symptoms (Hedges g 0.21, 95% CI 0.10 to 0.32, a small effect) and with higher odds of a 50% or greater improvement in symptoms (odds ratio 2.30, 95% CI 1.30 to 4.06). Dropout was no different from placebo. The effect depended on dose and on how variable symptoms were at baseline. The authors noted that the trials were heterogeneous, that depression wasn't always the main outcome, and called for preregistered trials with depression as the primary endpoint. The abstract does not report separate results for men with low versus normal testosterone.
Put together: in men with low testosterone, treatment is associated with modest, consistent, small improvements in mood and energy. The effect is not large, and nothing here shows it can replace depression treatment. Our TRT guide lists what treatment does and doesn't improve.
What the research doesn't show
- It doesn't show testosterone works as a depression treatment. No trial we reviewed compared testosterone with therapy or antidepressants, and the effects were small.
- It excluded the most severe cases. The Testosterone Trials left out men with severe depression, so the results can't be read as applying to them.
- It mostly tested one form. TRAVERSE used a daily gel, and the older men in the Testosterone Trials used a gel too. Results may differ with other forms.
- It doesn't cover men with normal testosterone clearly. The pooled analysis mixed both groups without separating them in its abstract.
- It doesn't cover supplements. "Testosterone boosters" are a different question; see what the evidence shows.
- It says little about long-term mood. The Testosterone Trials followed mood for one year, and longer-term effects are less clear.
If you're dealing with both
Mood problems deserve their own evaluation, whatever your testosterone level is. Depression and anxiety are highly treatable, usually with therapy, medication, or both, and the first step is a conversation with a doctor or licensed mental health professional. Our guide to getting help covers who to see, what it costs, and what to expect, and has a section on testosterone.
If low testosterone might be part of the picture, a clinician can check it properly: morning blood tests, repeated if low, interpreted alongside your symptoms. See getting tested. Whether and how to treat it, and how that fits with treatment for mood, is a decision for you and your prescriber. Don't stop or change any medication on your own, and be wary of any clinic that offers testosterone for low mood without proper testing and monitoring; our provider reviews look at exactly that.
When to get help now
Low mood that lasts more than two weeks, loss of interest in things you used to enjoy, hopelessness, or changes in sleep, appetite, or energy are all reasons to talk to someone. If you are having thoughts of suicide or harming yourself, call or text 988 now (veterans: 988, then press 1), or call 911 in an emergency. See suicide warning signs and getting help.
Sources
- Shores MM, Sloan KL, Matsumoto AM, et al. Increased incidence of diagnosed depressive illness in hypogonadal older men. Arch Gen Psychiatry. 2004;61(2):162-167. PubMed
- Snyder PJ, Bhasin S, Cunningham GR, et al. Effects of testosterone treatment in older men. N Engl J Med. 2016;374(7):611-624. PubMed
- Bhasin S, Seidman S, Travison TG, et al. Depressive syndromes in men with hypogonadism in the TRAVERSE trial: response to testosterone-replacement therapy. J Clin Endocrinol Metab. 2024;109(7):1814-1826. PubMed
- Walther A, Breidenstein J, Miller R. Association of testosterone treatment with alleviation of depressive symptoms in men: a systematic review and meta-analysis. JAMA Psychiatry. 2019;76(1):31-40. PubMed
- Hauger RL, et al. The role of testosterone, the androgen receptor, and hypothalamic-pituitary-gonadal axis in depression in ageing men. Rev Endocr Metab Disord. 2022. PubMed
- Wu FC, Tajar A, Beynon JM, et al. Identification of late-onset hypogonadism in middle-aged and elderly men. N Engl J Med. 2010;363(2):123-135. PubMed