Low Testosterone and Depression in Men Over 40: What the Research Actually Shows

Low testosterone and depression overlap in men over 40, sharing fatigue, low libido, poor sleep and weak concentration. A VA study found depression diagnoses about three times as often in older men with low testosterone. Testosterone therapy lowers depressive symptoms modestly on average, but the large TRAVERSE substudy found no benefit in men with mild persistent depression. Here is how to tell them apart and what to test.

Low testosterone and depression are linked in men over 40, but the link runs in more than one direction and testosterone therapy is not a reliable treatment for depression. Men with low testosterone report more depressive symptoms on average. Depression, poor sleep, weight gain and chronic stress also push testosterone down. Many of the symptoms are identical, so a man who feels flat, tired and uninterested in sex can easily be told he has one condition when he has the other, or both.

Men are also less likely to be diagnosed with depression in the first place. Male depression often shows up as irritability, anger, longer hours at work, heavier drinking or withdrawal rather than sadness. Those signs are easy to blame on age or on hormones. This guide covers what the large studies found, where testosterone therapy helps and where it does not, and how to get the right workup.

Low testosterone can contribute to depressive symptoms, but research has not shown that low testosterone alone causes clinical depression in most men. The strongest evidence is observational. In 2004, Molly Shores and colleagues at the VA Puget Sound followed 278 men aged 50 and older who had no depression at the start. Over two years, 21.7 percent of men with low testosterone were diagnosed with depression, compared with 7.1 percent of men with normal levels, a hazard ratio of about 2.7 after adjustment.

The Health in Men Study in Perth, Australia, found a similar pattern. Osvaldo Almeida and colleagues measured hormones in 3,987 men aged 71 to 89 and reported in Archives of General Psychiatry in 2008 that men in the lowest fifth of free testosterone had roughly three times the odds of depression as men in the highest fifth. Observational studies like these show association. Illness, obesity and inactivity lower testosterone and raise depression risk at the same time, which makes cause hard to separate from coincidence.

Testosterone affects mood through androgen receptors in brain regions that handle motivation and emotion, including the amygdala, hippocampus and prefrontal cortex. Part of testosterone's effect in the male brain also comes from conversion to estradiol by the aromatase enzyme. Animal studies and small human imaging studies suggest testosterone changes serotonin and dopamine signaling and how strongly the amygdala responds to threat.

Testosterone and mood also interact through the body. Low testosterone in men is tied to lost muscle, more visceral fat, poorer sleep and lower energy, and each of those can drag mood down. Depression in turn raises cortisol, disrupts sleep and cuts activity, all of which lower testosterone further. The loop below is why many men end up with both.

Low testosterone and depression can only be told apart reliably with a blood test and a validated depression questionnaire, because most symptoms overlap. Some patterns help. Low testosterone tends to hit sex drive, morning erections, muscle mass and physical energy first. Depression is more likely to bring hopelessness, guilt, loss of enjoyment in everything, and thoughts of death. Both cause fatigue, poor focus and sleep problems.

The PHQ-9 is a nine-question screening tool used in most primary care clinics. PHQ-9 scores of 5, 10, 15 and 20 mark mild, moderate, moderately severe and severe depressive symptoms. A man with a PHQ-9 of 14 and a testosterone of 600 ng/dL is unlikely to have a hormone problem. A man with a PHQ-9 of 6, a testosterone of 210 ng/dL and no morning erections may well have one.

Low testosterone becomes more common with each decade after 50. In the Baltimore Longitudinal Study of Aging, Mitchell Harman and colleagues reported in 2001 that about 12 percent of men in their 50s had total testosterone in the hypogonadal range, rising to 19 percent in their 60s, 28 percent in their 70s and 49 percent in their 80s. Total testosterone falls by roughly 1 percent a year after about age 40 in healthy men, and faster in men with obesity or chronic illness.

Testosterone therapy lowers depressive symptoms modestly on average, but the benefit is small and inconsistent across trials. Andreas Walther and colleagues pooled 27 randomized placebo-controlled trials with 1,890 men in JAMA Psychiatry in 2019. Testosterone reduced depressive symptoms with an effect size of about 0.21, which researchers class as small. Effects were larger in trials using higher doses and in carefully selected groups.

The Testosterone Trials, published in the New England Journal of Medicine in 2016, gave 790 men aged 65 and older with total testosterone under 275 ng/dL either testosterone gel or placebo for a year. Testosterone gel slightly improved mood and depressive symptom scores and clearly improved sexual function. The mood gains were real but modest, about the size most men would notice as feeling a little better rather than transformed.

The TRAVERSE trial produced the most sobering result. TRAVERSE enrolled 5,204 men aged 45 to 80 with low testosterone and heart disease risk. A depression substudy led by Shalender Bhasin and published in JAMA Network Open in 2024 looked at men with low-grade persistent depressive symptoms. Testosterone gel did not improve depressive symptoms compared with placebo over the study period. For men whose main complaint is low mood, TRAVERSE is the strongest evidence that testosterone is not the answer by itself.

Testosterone as an add-on to antidepressants has mixed results and is not a standard treatment. A small 2003 trial by Harrison Pope and colleagues at McLean Hospital, published in the American Journal of Psychiatry, found that testosterone gel improved depression scores in men with low testosterone who had not responded to antidepressants. A larger follow-up trial by the same group, published in 2010, found no clear benefit over placebo. Some psychiatrists still check testosterone in men with treatment-resistant depression, because correcting a genuine deficiency removes one drag on recovery.

Antidepressants and testosterone can also interact through sexual side effects. SSRIs such as sertraline and escitalopram commonly reduce libido and delay orgasm. A man who starts an SSRI and then notices low sex drive may assume his testosterone dropped when the medication is the cause. A testosterone test before starting an antidepressant gives a baseline that makes this easier to sort out later.

A man over 40 with low mood, low energy and low libido should ask for a depression screen and a hormone panel at the same visit. The Endocrine Society's 2018 guideline recommends diagnosing low testosterone only with symptoms plus two fasting morning total testosterone results below about 264 ng/dL. Several other common conditions mimic both low testosterone and depression and are cheap to rule out.

Exercise, weight loss, better sleep and less alcohol improve testosterone and mood together, and the evidence for these on mood is stronger than the evidence for testosterone therapy. Michael Noetel and colleagues analyzed 218 trials with 14,170 participants in the BMJ in 2024 and found walking or jogging, yoga and strength training produced moderate reductions in depression, with more vigorous exercise doing better. Losing 10 percent of body weight raises testosterone in men with obesity in several studies, often by 50 to 100 ng/dL.

• Strength training 2 to 3 times a week with compound lifts such as squats, rows and presses
• 150 minutes a week of brisk walking, cycling or jogging, ideally outdoors in morning light
• 7 to 9 hours of sleep with a fixed wake time; one week of 5 hour nights cut testosterone 10 to 15 percent in a 2011 JAMA study
• Alcohol kept to a few drinks a week, since alcohol worsens both sleep and mood
• Regular time with friends; social isolation is a major depression risk for middle-aged men
• Talk therapy such as cognitive behavioral therapy, which has strong evidence for depression in men

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