They Never Checked Your Testosterone

Your mood is downstream of your biology, and most doctors are not checking the biology.

The standard model for treating depression in men runs like this: you describe your symptoms, the doctor scores your answers on a questionnaire, and if you hit the threshold you leave with a prescription. That process is not wrong, exactly, but it skips a question that changes everything. What is actually causing those symptoms?

Here is the chain you need to understand before anything else. Testosterone is not just a sex hormone. It acts on receptors throughout your brain, including regions that regulate mood, motivation, energy, and the ability to feel reward. When testosterone drops, those brain systems lose a key input, and the output looks almost identical to what we call clinical depression. Flat affect. No drive. Cognitive fog. Disrupted sleep. Anhedonia, which is the clinical word for losing the ability to feel pleasure in things that used to matter. That is the whole symptom cluster.

So when a man walks into a doctor's office describing those symptoms, there are two very different things that could be happening. His brain chemistry regulation system could be failing, which is what antidepressants address. Or his hormonal input system could be failing, which antidepressants do not address. The problem is that from the outside, sitting across a desk for fifteen minutes, these two things look identical.

Only 3.2% of men in one large health system had ever been tested for testosterone. That number comes from a study that reviewed records for tens of thousands of men, and it means that for every hundred men on antidepressants, roughly three of them had anyone check the most obvious hormonal cause first.

The scale of the underlying problem makes this more significant. A study called the HIM study looked at men aged 45 and older in primary care settings and found that 38.7% of them had testosterone levels in the hypogonadal range, which means levels low enough to produce symptoms. That is not a rare edge case. That is nearly four in ten men at the age when depression diagnoses are also climbing.

The direct connection between these two things was quantified in a study published in the Archives of General Psychiatry that followed men over time and found that men with low testosterone had a 4.2 times higher hazard ratio for receiving a depression diagnosis compared to men with normal levels. A hazard ratio is a measure of how much more likely an event is to occur, and 4.2 is not a subtle signal. It means low testosterone is one of the stronger predictors of a depression diagnosis that we have.

Now here is where the treatment path gets complicated.

Selective serotonin reuptake inhibitors, which are the most commonly prescribed class of antidepressants and work by increasing serotonin availability in the brain, have documented effects on the endocrine system. Research published in 2025 confirmed that SSRIs decrease serum testosterone levels in men. So if a man's depression was being driven, at least in part, by low testosterone, and he gets prescribed an SSRI, the medication may suppress his testosterone further. His mood might partially improve through the serotonin pathway, or it might not, but the hormonal problem is now worse than when he started, and there is no obvious diagnostic signal pointing anyone back toward the testosterone.

This is not an argument that SSRIs are bad or that they do not work. For a man whose depression is rooted in serotonin dysregulation, they are often the right intervention. The issue is the sequence. If you have not tested whether low testosterone is driving the symptoms, you cannot know which category you are in.

The therapeutic case for addressing testosterone directly is not theoretical. A meta-analysis published in JAMA Psychiatry pooled data from 27 randomized controlled trials with a total of 1,890 participants and found that testosterone treatment significantly reduced depressive symptoms compared to placebo. The effect held across different populations and different ways of delivering testosterone, which makes the finding more robust because it is not dependent on one specific study design.

What this means practically is that for some men, restoring testosterone to a normal range resolves the mood symptoms without any psychiatric medication at all. For others, the hormonal issue and the neurochemical issue coexist, and both need to be addressed. But you cannot make that determination without the test.

The test itself is a standard blood panel. A total testosterone draw, typically done in the morning when levels peak, and ideally paired with free testosterone because total levels can look normal while the biologically active fraction is low. This is not an expensive or exotic workup. It is the kind of test that should logically precede prescribing to a man who presents with the symptom cluster described above.

If your levels come back in a normal range, that is useful information too. It narrows the field and points toward other causes. The test does not commit you to any particular treatment. It just tells you what you are actually working with.

The real problem is not that doctors are wrong about depression. It is that the diagnostic process for depression in men does not require ruling out the most common hormonal cause first, and so most of the time, nobody does. You get treated for the label that fits the symptoms, not necessarily for the mechanism producing them. And in medicine, treating the label instead of the mechanism is how people spend years on the wrong intervention while the actual problem continues unchanged.

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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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