Written by Keen Meds  ·  Reviewed by Licensed Clinical Providers  ·  March 1, 2026

Key Insight: Multiple clinical studies have found significantly elevated rates of hypogonadism in men with treatment-resistant depression -- with TRT producing mood improvement in those with confirmed low T.

> Multiple clinical studies have found significantly elevated rates of hypogonadism in men with treatment-resistant depression -- with TRT producing mood improvement in those with confirmed low T.

Medically reviewed by licensed clinical providers · March 2026

Depression in men is frequently undertreated. Male depression often presents differently than the classical picture, and many men with low mood, reduced motivation, and emotional flatness do not recognize their experience as depression at all. What is less commonly understood is that a meaningful subset of men diagnosed with depression -- or who experience depressive symptoms that do not respond to antidepressants -- may have a hormonal explanation. The symptom profiles of major depressive disorder and hypogonadism overlap so substantially that the two conditions are regularly confused, and treatment for one may be directed at the wrong diagnosis. This post examines the overlap, reviews what clinical evidence shows, and describes how hormone evaluation fits into the picture.

The Diagnostic Overlap Problem

The DSM-5 criteria for major depressive disorder include: depressed mood, loss of interest or pleasure in previously enjoyed activities (anhedonia), fatigue or loss of energy, sleep disturbance, difficulty concentrating, psychomotor slowing, and decreased libido. Almost every item on this list is also a recognized symptom of hypogonadism.

When a man presents to a primary care physician or psychiatrist with these symptoms -- low mood, fatigue, reduced libido, concentration difficulty, loss of motivation -- depression is the more likely first diagnosis. Standard of care in most settings is a psychiatric evaluation followed by antidepressant therapy. Hormone evaluation is not always part of the initial workup.

The problem is that if the underlying driver is low testosterone rather than (or in addition to) a serotonergic deficit, antidepressants may produce limited or no improvement. Men in this situation are labeled as having "treatment-resistant depression" and may cycle through multiple antidepressant trials without meaningful benefit -- while the hormonal cause remains unaddressed.

How Common Is Hypogonadism in Depressed Men?

Research consistently documents elevated rates of hypogonadism in men presenting with depression. Studies across multiple clinical settings -- outpatient psychiatry, primary care, and specialist endocrinology -- find that 20 to 30% of men with depression have testosterone levels below the clinical threshold, compared to roughly 2 to 5% in age-matched general population samples.

In treatment-resistant depression specifically, the rates are higher. A number of studies have found that between 30 and 50% of men with depression that does not respond to antidepressants have measurable testosterone deficiency. This does not mean testosterone is the cause in every case, but the association is clinically significant and frequently missed.

What the TRAVERSE Depression Sub-Study Found

The TRAVERSE trial (NEJM, 2023) -- the largest randomized trial of testosterone therapy conducted, enrolling 5,246 men -- included a pre-specified sub-study examining mood outcomes. Men receiving testosterone therapy showed measurable improvements on validated depression symptom scales compared to placebo. The effect was most pronounced in men with baseline confirmed hypogonadism and moderate depressive symptoms.

These findings align with earlier data from the T-Trials vitality sub-study, which showed improvements in depressive symptom scores and sexual function in men 65 and older with low testosterone. Together, the evidence suggests that testosterone therapy produces clinically meaningful mood improvements in men with documented hypogonadism, and that this effect is distinct from antidepressant mechanisms.

When Is Low Testosterone the Primary Cause of Depressed Mood?

Clinicians consider hormonal etiology most strongly when several features are present:

  • Depression symptoms developed gradually over months to years, without a clear psychosocial precipitant
  • The mood picture includes anhedonia (loss of pleasure) and motivational flatness more prominently than acute sadness or grief-like symptoms
  • Libido reduction and fatigue are prominent alongside mood symptoms
  • Antidepressant trials have produced inadequate response
  • The patient is male and over 35
  • Physical symptoms consistent with hypogonadism are also present (reduced muscle, increased body fat, sexual dysfunction)

None of these features alone confirms a hormonal cause. They collectively suggest that hormone evaluation is a necessary step before assuming the etiology is purely psychiatric.

When Both Conditions Are Present

Hypogonadism and depression can coexist, and frequently do. The relationship is likely bidirectional: low testosterone impairs neurotransmitter regulation (particularly dopaminergic and serotonergic tone), which may lower the threshold for depression. Chronic depression, in turn, dysregulates the HPG axis and can suppress testosterone production through stress and elevated cortisol. Either condition can initiate or worsen the other.

For men where both are confirmed, a combined approach is often most effective. TRT addresses the hormonal substrate; appropriate mental health support addresses the psychological and behavioral dimensions of depression. In many cases, successful testosterone normalization reduces the severity of depressive symptoms to a level where other interventions become more effective.

The decision about whether to treat hormonally, psychiatrically, or both belongs to a qualified clinician reviewing the full picture. The appropriate role of this information is to prompt a conversation -- particularly if antidepressant therapy has been tried without satisfactory results.

What to Say to Your Doctor

Many men with low mood and hypogonadism symptoms have not discussed the connection with their clinician, either because they do not know to raise it or because depression feels easier to attribute to life circumstances than to investigate hormonally. A straightforward approach is to request a morning fasting testosterone level alongside a standard lab panel when presenting with mood or energy complaints.

The diagnostic standard for hypogonadism requires two separate morning fasting testosterone measurements below 300 ng/dL, combined with clinical symptoms. A single test is not sufficient for a diagnosis, but it is sufficient to begin the clinical conversation.

If testosterone is confirmed low, TRT may address mood symptoms that have not responded to other approaches. If testosterone is normal, other explanations remain -- but the hormonal question has been answered, and the clinical picture is clearer.

Frequently Asked Questions

Can TRT replace antidepressants for men with low testosterone?
TRT is not a first-line psychiatric treatment and should not be framed as a replacement for antidepressants in all cases. For men with confirmed hypogonadism whose mood symptoms are primarily hormonal in origin, TRT may resolve or substantially reduce depressive symptoms without the need for antidepressants. For men with both conditions, a combined approach supervised by appropriate clinicians may be optimal. The decision requires individualized clinical evaluation.

How long does it take for TRT to improve mood?
Men with confirmed hypogonadism who respond to TRT typically notice improvements in mood and emotional flatness within 4 to 6 weeks. More sustained mood stabilization, including improvements in motivation and anhedonia, often develops over 3 to 6 months as testosterone levels reach a stable therapeutic range. Individual response varies.

Should testosterone be checked as part of a depression evaluation in men?
Clinical evidence supports routine testosterone evaluation in men presenting with depression, particularly those over 35 or those with symptoms that overlap with hypogonadism. Some clinical guidelines recommend it as a standard part of a depressive symptom workup in men. If your clinician has not checked testosterone as part of a mood evaluation, it is reasonable to request it.

Is Depression Part of Your Low Testosterone Picture?

If low mood, motivational flatness, and emotional blunting are part of a pattern -- alongside fatigue, reduced libido, or poor antidepressant response -- low testosterone may be a contributing factor. A blood test is the only way to confirm.

Keen Meds connects you with a licensed clinical team for a telehealth consultation and lab review. If your testosterone is clinically low, you receive a prescription for Testosterone Spray Rx -- delivered via Hypospray®, Keen's needle-free transdermal spray platform.

Start your Keen Testosterone Spray Program →

Medically reviewed by Licensed Clinical Providers · March 2026

Related reading: