They Never Checked Your Testosterone
Your body runs on a hormone system that operates like a chain of commands, and when any part of that chain breaks down, the effects ripple out in ways that are easy to misread.
The chain starts in your brain. Your hypothalamus sends a signal called GnRH, which tells your pituitary gland to release something called LH, which travels through your bloodstream to your testes and tells them to produce testosterone. That testosterone then circulates through your body, affecting your muscle tissue, your bone density, your red blood cell production, your libido, and critically, your brain.
That last part is where most people miss the connection.
Testosterone receptors are densely distributed throughout the limbic system, which is the part of your brain that regulates mood, motivation, and emotional response. When testosterone binds to those receptors, it influences the production and regulation of dopamine and serotonin, two of the primary chemical messengers your brain uses to generate feelings of drive, reward, and wellbeing. When testosterone is low, that signaling becomes weaker, and the result is a state that looks almost indistinguishable from clinical depression.
You are tired. You do not want to do the things you used to want to do. Your thinking is slow. Your sleep is broken. Nothing feels urgent or exciting anymore. And if you bring those symptoms to a doctor who does not think to check your hormones first, you will almost certainly leave with a prescription.
A study published in the Archives of General Psychiatry followed a group of men 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 testosterone levels. That is not a small statistical signal. That is a near overlap of two distinct conditions producing the same surface-level presentation.
And yet a study published in the Journal of Sexual Medicine found that only 3.2 percent of men in a large health system had ever had their testosterone measured. Which means that for the vast majority of men presenting with depressive symptoms, the most direct hormonal contributor to those symptoms was never ruled out before treatment began.
That gap is where the problem compounds.
Because certain antidepressants, specifically a class called SSRIs, which stands for selective serotonin reuptake inhibitors and which work by keeping serotonin active longer in the synaptic space between neurons, have been shown to lower testosterone levels. Research published in JBRA Assisted Reproduction found that SSRIs decrease serum testosterone and suppress sperm production through interference with the hypothalamic-pituitary axis, which is the same chain of command described above. The medication intended to address the mood problem may be further suppressing the hormonal system that was driving the mood problem in the first place.
This is not a theoretical concern. This is a mechanistic consequence of the treatment, and it creates a feedback loop that is difficult to identify if no one is tracking testosterone levels over time.
The opposite experiment has also been run. A meta-analysis published in JAMA Psychiatry in 2019 pooled data from 27 randomized controlled trials involving 1,890 men and found that testosterone treatment produced a statistically significant reduction in depressive symptoms. The effect size was meaningful, not marginal. And the effect was particularly pronounced in men who had been diagnosed with hypogonadism, which is the clinical term for testosterone levels that have fallen below the functional threshold for normal male physiology.
That threshold becomes increasingly relevant with age. The HIM study, published in the International Journal of Clinical Practice, screened men aged 45 and older in primary care settings and found that 38.7 percent had testosterone levels consistent with hypogonadism. Nearly four in ten men past middle age were walking around with clinically low testosterone, many of them without a diagnosis, and some subset of them very likely sitting in a doctor's office describing symptoms that were being attributed to something else.
None of this means antidepressants are the wrong answer. For men whose depression is driven by neurochemical dysregulation that exists independently of their hormone levels, antidepressants can be genuinely effective and appropriate. That is not in question here.
What is in question is the sequence of evaluation.
When a man walks in describing fatigue, low motivation, cognitive fog, disrupted sleep, and a loss of interest in things he used to care about, there are two plausible explanations on the table. One is a mood disorder. The other is a hormonal deficiency. Both produce the same set of symptoms. One of them requires a simple blood draw to detect. And in more than 96 percent of cases, according to the data, that blood draw is never ordered.
The practical implication is straightforward. Before any man accepts a diagnosis of depression and a corresponding prescription, the baseline question worth asking his doctor is whether testosterone has been measured. A standard lab panel will typically include total testosterone, and a more complete picture includes free testosterone, which is the portion of testosterone not bound to proteins and therefore actually available to act on receptors. Both numbers matter because a man can have normal total testosterone but low free testosterone and still experience the full symptom profile of deficiency.
If testosterone comes back normal, then the conversation about medication becomes much cleaner. You have ruled out the hormonal variable and you are treating something that exists on its own terms.
If testosterone comes back low, then the treatment path changes entirely, and you may be looking at a problem with a more direct solution than a psychiatric medication.
The real issue is not that antidepressants are being prescribed. The real issue is that the question being answered is not always the right question. Depression is a diagnosis of symptoms. Hypogonadism is a diagnosis of a measurable biological state. When the symptoms overlap perfectly and only one of those conditions can be confirmed with a blood test, running that test first is not optional.
It is the only way to know what you are actually treating.
References
- 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
- 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
- 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
- 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
- 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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