They Never Checked Your Testosterone

Your mood is downstream of your biology, and most doctors are not measuring the biology before they treat the mood.

Here is the chain you need to understand first. Testosterone is produced primarily in the testes through a signaling cascade that starts in the brain, where a structure called the hypothalamus releases something called GnRH, which is a messenger hormone that tells the pituitary gland to release LH, which then tells the testes to produce testosterone. That testosterone circulates through the blood, crosses into the brain, and directly influences the systems that regulate mood, motivation, energy, and cognitive clarity. When that signal is low, every one of those systems gets quieter. That is the full pathway. Now zoom into what happens when it breaks down.

Low testosterone does not feel like a hormone problem. It feels like a life problem.

The experience is dragging through the day with no clear reason, losing interest in things that used to matter, struggling to think clearly, sleeping but not recovering, and feeling a kind of flatness that is hard to describe but impossible to miss. That list is also the clinical checklist for major depressive disorder, and that overlap is not a coincidence. It is because testosterone directly modulates dopaminergic and serotonergic activity in the brain, meaning it affects the exact same neurotransmitter systems that antidepressants are designed to target.

So when a man walks into a doctor's office with those symptoms, the visit often ends with a prescription, not a lab order.

A study published in the Archives of General Psychiatry followed men over several years and found that those with low testosterone had a 4.2 times higher hazard ratio for being diagnosed with depression. That is not a small signal. That is a fourfold increase in the likelihood that your symptoms will be labeled a psychiatric condition when they may be a hormonal one. And the rate at which this gets checked before that label is applied is staggeringly low. Research published in the Journal of Sexual Medicine looked at a large health system and found that only 3.2 percent of men had ever been tested for testosterone levels at any point in their care.

That means for every hundred men sitting in a waiting room with these symptoms, roughly ninety-seven have never had the most basic biological variable measured.

Now layer in something that makes this worse. Certain antidepressants, specifically the class called SSRIs, which are selective serotonin reuptake inhibitors that work by keeping more serotonin available in the gaps between neurons, have been shown to decrease serum testosterone levels and reduce sperm production. So a man who starts on an antidepressant because his low testosterone was misread as depression may find that the medication itself is pushing his testosterone lower, which makes the mood symptoms worse, which leads to a dose adjustment or a medication change, and the actual driver never gets addressed.

This is not an argument against antidepressants. For a subset of men, those medications are the correct intervention and they work. The issue is diagnostic sequence, not medication category.

If you do not measure before you treat, you do not know what you are treating.

The research on testosterone's direct effect on depression is not theoretical at this point. A meta-analysis published in JAMA Psychiatry pooled data from 27 randomized controlled trials covering 1,890 men and found that testosterone treatment significantly reduced depressive symptoms across that population. The effect held even in men who had not responded fully to antidepressants, which suggests the two systems, hormonal and neurotransmitter, are operating somewhat independently and that addressing one does not automatically fix the other.

The prevalence data makes this more urgent. A large study called the HIM study, which stands for Hypogonadism in Males, screened men forty-five and older in primary care settings and found that 38.7 percent of them had testosterone levels in the hypogonadal range, meaning clinically low. That is roughly four out of every ten men in that age group sitting in their doctor's office with a hormonal deficit that may or may not have been identified.

The word hypogonadism, by the way, simply means the gonads, in this case the testes, are not producing sufficient hormone output. It is not a rare or exotic condition. It is one of the most common and least diagnosed hormonal states in aging men.

So what do you actually do with this.

The first step is not a supplement or a protocol. It is a lab draw. A basic testosterone panel includes total testosterone, free testosterone, LH, FSH, and SHBG. Something called SHBG, or sex hormone binding globulin, is a protein that binds to testosterone in the blood and renders it biologically inactive, so a man can have a normal-looking total testosterone number but have so much of it bound up that his free testosterone, the portion his body can actually use, is well below the functional range. Without that full picture, the number on its own is incomplete.

Timing also matters. Testosterone follows a circadian rhythm and peaks in the early morning, typically between seven and ten AM, so a blood draw in the afternoon can return a number that is artificially lower than your true baseline. Two morning draws on separate days is the standard recommendation before any clinical decision gets made.

If those levels come back low and the symptoms match, that conversation with a physician becomes very different than the one that starts and ends with symptom rating scales.

The deeper issue here is not really about testosterone. It is about diagnostic thoroughness. A symptom cluster like fatigue, low mood, cognitive fog, and loss of motivation can be caused by hypothyroidism, sleep apnea, anemia, nutritional deficiency, cortisol dysregulation, or low testosterone, and most of those have a lab value attached to them. Treating the symptom without identifying the driver is like replacing the battery in a car that has no fuel. You are working on the system, just not the right one.

The prescription gets written in fifteen minutes. The testing takes a blood draw and a few days. And the only reason to skip the test is not knowing you needed one.

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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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