They Never Checked Your Testosterone

Low testosterone and clinical depression produce nearly identical symptoms, and most doctors treat whichever one they see first without ever checking whether the other one might be driving it.

That is the whole problem.

When a man walks into a clinic feeling exhausted, emotionally flat, unable to concentrate, sleeping poorly, and disinterested in things he used to care about, the DSM checklist for depression lights up. So does the symptom profile for hypogonadism, which is the clinical term for testosterone deficiency, meaning testosterone levels too low for the body to function normally. The two conditions share so much overlap that distinguishing them without lab work is essentially guesswork.

And yet a large analysis of men in a real health system found that only 3.2 percent had ever been tested for testosterone at any point in their care.

That means for every hundred men who could potentially be sitting with undiagnosed testosterone deficiency, roughly 97 of them have gone through the medical system without anyone ever running that number. If low testosterone was responsible for even a fraction of those depression diagnoses, the downstream consequences would be significant.

To understand why this matters, you need to understand what testosterone is actually doing in the brain, not just the body.

Most people think of testosterone in terms of muscle and sex drive, which are real effects, but testosterone also binds to receptors in the limbic system, which is the part of the brain that regulates mood, motivation, and emotional response. It influences the production and sensitivity of serotonin and dopamine, the two neurotransmitters that most antidepressants are designed to target. So when testosterone drops, you are not just losing a hormone that builds muscle. You are losing a signal that the brain depends on to regulate how you feel and what you care about.

This is the mechanism that explains the overlap in symptoms, and it is also why fixing the wrong variable can leave a person feeling like their treatment is not working.

The numbers here are not small. A study published in the Archives of General Psychiatry followed a group of older men and found that those with low testosterone had a 4.2 times higher hazard of being diagnosed with depression compared to men with normal levels. That is not a modest association. And the HIM study, which looked at men aged 45 and older across primary care settings, found that 38.7 percent of them had testosterone levels in the hypogonadal range, which means more than one in three men in that age group had clinically low testosterone, most of them presumably undiagnosed.

Put those two things together: a condition that affects roughly 4 in 10 older men, nearly doubles the odds of a depression diagnosis, and goes untested in 97 percent of cases. That is how a lot of people end up on antidepressants without anyone ever identifying what was driving the problem.

Now here is where it gets more complicated.

Certain antidepressants, specifically a class called SSRIs, which stands for selective serotonin reuptake inhibitors and means drugs that increase available serotonin by preventing it from being reabsorbed between nerve cells, have been shown to suppress testosterone levels. A 2025 review published in JBRA Assisted Reproduction found that SSRIs decrease serum testosterone and reduce sperm production in men. The mechanism is not fully worked out yet, but the effect appears to be real.

So if a man starts with low testosterone, gets prescribed an SSRI without a hormone workup, and the SSRI further suppresses his testosterone, he now has lower testosterone than when he started and he is being told the medication is not working well enough. The next step is often a higher dose or a different drug, not a hormone panel.

This is not an argument against antidepressants. For men whose depression is driven by serotonin dysregulation, or by trauma, or by circumstances that have nothing to do with hormones, SSRIs can be genuinely effective and appropriate. The point is not that one treatment is right and another is wrong. The point is that treatment without diagnosis is a coin flip.

The research on testosterone replacement in men with depression supports this. A meta-analysis published in JAMA Psychiatry pooled 27 randomized controlled trials covering 1,890 men and found that testosterone treatment significantly reduced depressive symptoms compared to placebo. The effect was meaningful, not marginal, and it was consistent across studies. That does not mean testosterone is a universal antidepressant. But it does mean that in men where low testosterone is part of the picture, addressing it directly moves the needle.

The practical implication is straightforward. Before any man accepts a depression diagnosis and a prescription as the full explanation for what he is experiencing, it is worth knowing what his testosterone looks like. Total testosterone is the standard first measure. Free testosterone, which is the portion not bound to proteins and actually available to tissues, gives a more complete picture. Both can be run through a standard blood panel.

The conversation with a doctor should include these numbers, not because testosterone is the answer in every case, but because without them, no one actually knows what they are treating.

There is a version of medicine that starts by ruling things out before adding things in. Running a hormone panel before a first psychiatric prescription is that kind of medicine. It costs almost nothing, it takes one blood draw, and it gives everyone in the room information they did not have before.

The symptom list for depression and the symptom list for low testosterone look almost identical because they are, in part, driven by the same underlying biology. The brain does not distinguish neatly between a mood disorder and a hormone deficiency. It just tells you something is wrong. The job of medicine is to figure out which thing.

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References

1. Shores MM, et al. Increased incidence of diagnosed depressive illness in hypogonadal older men. Archives of General Psychiatry. 2004;612:162-167. Men with low testosterone had a 4.2x higher hazard ratio for depression. Source
2. Malik RD, et al. Are we testing appropriately for low testosterone?: Characterization of tested men and compliance with current guidelines. Journal of Sexual Medicine. 2015;121:66-75. Only 3.2% of men in a large health system had ever been tested for testosterone. Source
3. Oliveira RA, et al. Selective Serotonin Reuptake Inhibitors SSRIs: Effects on male fertility. JBRA Assisted Reproduction. 2025;292:351-358. SSRIs decrease serum testosterone levels and reduce sperm production. Source
4. Walther A, et al. Association of Testosterone Treatment With Alleviation of Depressive Symptoms in Men: A Systematic Review and Meta-analysis. JAMA Psychiatry. 2019;761:31-40. 27 RCTs n=1,890 showed testosterone significantly reduces depressive symptoms. Source
5. Mulligan T, et al. Prevalence of hypogonadism in males aged at least 45 years: the HIM study. International Journal of Clinical Practice. 2006;607:762-769. 38.7% of men 45+ in primary care had hypogonadal testosterone levels. Source

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