They Never Checked Your Testosterone

Your brain runs on chemistry, and that chemistry depends on signals your body sends from the outside in, meaning hormones produced in your organs travel through your bloodstream and tell your brain how to function, how to feel, and how motivated to be.

Testosterone is one of those signals. It crosses into brain tissue and binds to receptors in the regions that regulate mood, motivation, energy, and the ability to feel pleasure, and when those receptors stop getting that signal, those systems go quiet.

What that looks like from the inside is: nothing feels worth doing, your concentration is gone, sleep does not restore you, and the things that used to matter do not seem to anymore.

That is also what depression looks like. Word for word, the same description.

So when someone with low testosterone sits across from a doctor and describes what they are experiencing, the doctor is looking at a checklist and every box is checked. The prescription gets written before anyone asks whether the underlying chemistry was ever measured.

A study published in the Archives of General Psychiatry followed men over time and found that men with low testosterone had a 4.2 times higher hazard ratio for being diagnosed with a depressive illness compared to men with normal levels. That number is not measuring correlation in a survey. It is measuring how many more men in the low testosterone group received an actual clinical diagnosis across time. The signal is that strong.

And yet only 3.2 percent of men in a large health system analysis had ever been tested for testosterone at any point in their lives, which means for the overwhelming majority of men who get a depression diagnosis, no one ever ruled out the hormonal explanation first.

Here is where it gets more complicated.

Certain antidepressants, specifically a class called SSRIs or selective serotonin reuptake inhibitors, which work by keeping serotonin active in the spaces between nerve cells for longer, have been shown to suppress testosterone levels in men. Research published in 2025 found that SSRIs decrease circulating testosterone and reduce sperm production, which means if your depression is at least partially driven by low testosterone, and you are then prescribed a medication that pushes testosterone lower, the underlying problem is not just untreated, it is being made worse.

That is not an argument against SSRIs as a category. For men with genuine clinical depression driven by brain chemistry rather than hormonal deficiency, they are appropriate and they work. The problem is not the medication. The problem is prescribing without diagnosing, which is only possible if you skip the measurement step entirely.

Think of it this way. If you have a car that will not start and you assume it is the battery, so you replace the battery without checking anything, and the real problem is the fuel line, the car still does not start. And now you have spent money on a battery you did not need. More importantly, nothing improved.

The same logic applies here. You cannot know what you are treating if you have not identified what is wrong.

What makes this harder is that testosterone decline does not announce itself. It tends to happen gradually, somewhere between 1 and 2 percent per year after the mid-thirties, and the symptoms accumulate slowly enough that men tend to adapt their self-perception around them rather than noticing the change. By the time someone is in a doctor's office describing low mood and low motivation, they have often been declining for years without a reference point.

The population numbers reflect how common this actually is. A study called the HIM study, which looked at men aged 45 and older in primary care settings, found that 38.7 percent had testosterone levels in the hypogonadal range, which is the clinical term for levels low enough to produce biological effects. That is more than one in three men in that age group, sitting in the same waiting rooms as everyone else, many of them likely describing the same symptoms.

A systematic review and meta-analysis published in JAMA Psychiatry aggregated 27 randomized controlled trials involving 1,890 men and looked at what happened when those men were given testosterone treatment. The result was a statistically significant reduction in depressive symptoms across the group. That is not anecdote. That is the strongest class of evidence available showing a direct relationship between restoring testosterone levels and improving mood.

What that tells you is that for a meaningful subset of men who are experiencing depression-like symptoms, the driver is hormonal, and the effective intervention is hormonal correction, not serotonin management.

So what do you actually do with this.

The first step is the one that should have happened before anything else: get a blood test. A standard testosterone panel measures total testosterone, and an expanded panel adds free testosterone, which is the portion of testosterone not bound to proteins and actually available to your cells, along with LH and FSH, which tell you whether the signal problem is coming from the brain or from the testes themselves. That single test tells you whether this conversation applies to you.

If levels are normal, then you are not dealing with a hormonal explanation and you can look elsewhere with more confidence. If levels are low, you now have information. You know what you are working with, and you can have a very different conversation with a physician about what the right intervention actually is.

The deeper issue here is that mood is being treated as a psychological problem by default when it is sometimes a physiological one, and the systems we have for evaluating mood were built around psychology, not endocrinology. A psychiatrist is trained to identify patterns of thought and behavior. An endocrinologist is trained to identify patterns in hormone levels. A primary care physician is often doing neither thoroughly enough when time is limited and a symptom checklist points toward the faster answer.

Depression is real. Antidepressants help real people. None of that is in question.

But a diagnosis is only as good as the evaluation that produced it, and an evaluation that never checked the one variable that could explain every symptom is not a complete evaluation.

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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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