They Never Checked Your Testosterone

Your testosterone could be low right now and nobody would ever know, because the symptoms of low testosterone and clinical depression are nearly identical and most doctors never order the test to tell them apart.

The list reads the same either way. You are exhausted no matter how much you sleep. Nothing motivates you. Your concentration is gone. The things that used to matter to you feel distant. You go to your doctor and describe all of this, and in most cases you walk out with a prescription for an antidepressant, because that is the obvious fit for what you just described.

But something called testosterone, which is the primary androgen your body produces and the hormone most responsible for drive, motivation, mood regulation, and cognitive sharpness in men, was never checked before that prescription was written.

A study published in the Archives of General Psychiatry followed men over time and found that those with low testosterone had a 4.2 times higher hazard ratio for being diagnosed with depression compared to men with normal levels. That is not a small association. That is a signal that the two conditions are deeply entangled, and it raises a question that most clinical encounters never actually ask: which one came first.

Here is what makes that question hard to answer. The brain regions that govern mood, specifically the prefrontal cortex and the limbic system, are dense with androgen receptors, which are the cellular structures that testosterone binds to in order to do its work. When testosterone is low, those receptors are understimulated, and the output is mood dysregulation, reduced motivation, and cognitive blunting. That is not metaphorical. That is the mechanism. And it looks, from the outside, exactly like depression.

So the clinical error is understandable. But it carries consequences.

A study characterizing testosterone testing rates across a large health system found that only 3.2 percent of men had ever been tested for low testosterone. That number includes men who had every reason to be tested based on their symptoms. The test is a simple blood draw. It costs very little. And in the vast majority of clinical encounters involving mood complaints in men, it does not happen.

Now add the treatment layer. Certain antidepressants, specifically SSRIs, which work by increasing serotonin availability in the brain, have been shown to reduce circulating testosterone levels. The proposed mechanism involves the serotonin system interfering with the signaling pathway that tells the testes to produce testosterone, a pathway that runs from the brain through something called the hypothalamic-pituitary-gonadal axis. Research published in 2025 found that SSRIs decrease serum testosterone and reduce sperm production through exactly this pathway.

What this means practically is that a man who already has borderline low testosterone, goes undiagnosed, starts an SSRI, and then feels worse over time now has a second layer of hormonal suppression on top of the original problem. His doctor increases the dose. Or switches the medication. And the actual driver, which was low testosterone all along, keeps getting further from view.

To be direct about something: for a meaningful portion of men, antidepressants are the right treatment. Depression is a real and serious condition, and SSRIs work for a lot of people. The argument here is not against them. The argument is about sequence. The argument is that treating something without first identifying what it is creates the risk of compounding a problem instead of solving it.

The data on treating low testosterone directly is instructive here. A meta-analysis published in JAMA Psychiatry pooled 27 randomized controlled trials involving 1,890 men and found that testosterone treatment significantly reduced depressive symptoms. The effect was meaningful, not marginal. Men whose depression was driven by hormonal deficiency responded to the hormonal fix, which is exactly what you would expect if the mechanism was hormonal in the first place.

And the scale of that hormonal deficiency in the general population is larger than most people assume. The HIM study, which assessed testosterone levels in men over 45 presenting to primary care, found that 38.7 percent of them had hypogonadal levels, meaning clinically low testosterone. Nearly four in ten middle-aged men walking into a doctor's office. Most of them not tested, not diagnosed, and many of them likely being treated for something else.

The reason this matters is not just the missed diagnosis. It is what happens to a person when the wrong framework gets applied to their experience. A man who is told he has depression, who takes medication for years without meaningful improvement, and who is never told that his testosterone was never checked, is operating on a false map of himself. He adjusts his identity around the diagnosis. He accepts a diminished version of his function as the baseline. And the actual correctable variable sits untouched underneath all of it.

A basic testosterone panel includes total testosterone, free testosterone, and usually LH and FSH to help distinguish whether the problem originates in the testes or in the signaling from the brain. It takes one blood draw, ideally in the morning when levels peak, and gives you information that changes everything about how you interpret the symptoms you are walking in with.

That is the test that should happen before the prescription. Not instead of careful psychiatric evaluation. Before it. Because if you do not know what you are treating, you are guessing, and in this case the guess has a cost.

The framing that depression is always a brain chemistry problem and testosterone is a separate, unrelated concern is the thing that keeps these two conditions siloed when they should not be. Testosterone is brain chemistry. It acts directly on the neural circuits that produce mood, motivation, and cognition. The separation was always artificial. And that artificial separation is why most men never get tested.

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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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