gynecology

Low Testosterone vs Depression: How They Are Told Apart

By Dr. Adeeb Alshahrour · December 28, 2025

Low testosterone and depression share almost every symptom people notice first: no energy, no drive, no interest in sex, poor sleep, and a general sense of being switched off. That overlap is real, and it is the reason a man with treatable depression can end up on testosterone instead, and a man with genuine hormone deficiency can end up on an antidepressant that never touches the cause.

Telling them apart is not a matter of intuition. It is a matter of a specific history, a specific set of blood tests taken at a specific time of day, and a specific screening conversation about mood.

If you are having thoughts of suicide or self-harm, do not wait for lab results. Call or text 988, the Suicide and Crisis Lifeline in the United States, or go to your nearest emergency department. That symptom is never a hormone problem to be worked up over weeks. It is treated now.

A note on why this page is here. This is a women's health practice. This article exists because the question arrives constantly — from partners working through the decision together, from households where two people are both being told their hormones are the problem, and from people who found nothing online but supplement advertising. For diagnosis and management of male hypogonadism, a urologist or endocrinologist is the right specialist. For the fuller picture of what testosterone therapy involves, see testosterone therapy for men in Chicago.

The symptoms that genuinely overlap

These belong to both conditions, and none of them distinguishes one from the other:

Low mood and a flat, dulled emotional range
Fatigue that sleep does not repair
Low libido and reduced sexual interest
Poor concentration and the sense of thinking through fog
Sleep disturbance, particularly early waking
Loss of motivation and withdrawal from things that used to matter
Irritability and a shorter fuse than usual

A man presenting with only this list cannot be sorted by symptoms alone. Anyone who tells you otherwise after a five-minute questionnaire is selling something.

The features that do point one way

Pointing toward depression:

Anhedonia — not just less interest, but genuine inability to take pleasure in anything, including things that reliably worked before
Guilt and worthlessness that will not lift and are out of proportion to events
Hopelessness about the future specifically, rather than tiredness about the present
Thoughts of death, self-harm, or that others would be better off — the single most important symptom on this page
Marked appetite or weight change in either direction
A history of previous depressive episodes, or a family history of them

Pointing toward testosterone deficiency:

Loss of morning erections and reduced spontaneous erections — one of the more specific signs
Reduced body and facial hair, and shaving less often than you used to
Small or shrinking testicles, which points to a testicular cause directly
Gynaecomastia — new breast tissue development
Hot flushes and sweats, uncommon in men and suggestive when present
Loss of height, or a low-trauma fracture, from reduced bone density
Infertility discovered during a couple's workup

These lists are not a scoring system. They tell a clinician which direction to test in.

How testosterone deficiency is actually diagnosed

This is where most direct-to-consumer testosterone services fail, and it is worth knowing the standard.

A diagnosis requires both consistent symptoms and biochemical confirmation. Neither alone is enough.

At least two separate early-morning, fasting total testosterone measurements, drawn on different days. Testosterone peaks in the morning and falls through the day, so an afternoon draw can read low in a man whose levels are entirely normal. A single low afternoon level is not a diagnosis. It is not even a good hint.
Both must be below the laboratory's reference range. The American Urological Association uses a threshold of 300 ng/dL; the Endocrine Society cites a lower limit of 264 ng/dL for assays harmonised to the CDC standard. Assays and reference ranges differ, so the comparison that matters is against the reporting laboratory's own range, ideally using the same lab both times.
LH and FSH, to distinguish primary hypogonadism (a testicular problem — LH and FSH are high because the brain is signalling hard and getting no response) from secondary hypogonadism (a pituitary or hypothalamic problem — LH and FSH are low or inappropriately normal). These have different causes and different treatments.
Prolactin, because a prolactin-secreting pituitary tumour can present exactly as low testosterone plus low mood, and treating it with testosterone leaves the tumour in place.
SHBG and free or calculated free testosterone where total testosterone is borderline. This matters most in obesity and in older men, where SHBG shifts and total testosterone misrepresents what is biologically available.

Levels are also suppressed by acute illness, so testing during or shortly after an infection produces a low result that means nothing. Repeat it when you are well.

What has to be looked for before blaming testosterone

Secondary hypogonadism usually has a cause, and the cause is often more treatable than the hormone level. Before any prescription, these have to be excluded or addressed:

Obesity — adipose tissue converts testosterone to estradiol, and meaningful weight loss meaningfully raises testosterone
Obstructive sleep apnoea — common, frequently undiagnosed, and a cause of both fatigue and suppressed testosterone
Opioids — a potent and often-missed suppressor of the entire axis
Glucocorticoids and other chronic steroid use
Alcohol, at sustained heavy intake
Uncontrolled type 2 diabetes and metabolic syndrome
Thyroid disease, which produces the same fatigue and low mood
Anaemia, chronic kidney or liver disease
Depression itself, which lowers testosterone through disrupted sleep, appetite, and activity

That last point is the trap. Depression can push testosterone down, so a low reading in a depressed man does not establish that the hormone caused the mood. The arrow runs both ways, and it is very often running the other way.

What the evidence actually shows about testosterone and mood

Plainly: testosterone therapy is not a treatment for major depressive disorder.

The honest summary of the trial evidence is that testosterone has a modest effect on depressive symptoms, and that effect is concentrated in men who have confirmed hypogonadism and milder, sub-threshold depressive symptoms. It performs poorly in men whose testosterone is already normal, and in men who meet criteria for major depression it has not been shown to work as a stand-alone treatment.

So the sequence matters. If a man has major depression, he needs treatment for major depression — psychotherapy, antidepressant medication, or both — whether or not his testosterone is also low. Correcting a hormone level is not a substitute for that, and the months spent waiting to see whether it helps are months of an untreated illness that carries real mortality.

If he also has properly confirmed hypogonadism, that can be treated too. Both, in the right order, not one instead of the other.

Depression is treatable, and testosterone has a cost

Major depression responds to treatment in most people who receive it. That is worth stating directly, because the belief that it does not is itself a symptom.

Testosterone therapy, by contrast, carries a consequence that is often not mentioned until too late: standard testosterone therapy suppresses sperm production, and can reduce sperm count to zero. External testosterone switches off the LH and FSH signals that drive spermatogenesis. Recovery after stopping is usual but not guaranteed and can take 6 to 24 months. If there is any chance you want biological children, that has to be discussed before starting, not after — and fertility-preserving alternatives exist, covered in detail on the testosterone therapy page.

Trading a treatable depression for an avoidable fertility problem is the worst version of getting this wrong.

What a proper first visit looks like

A structured depression screen — the same brief validated questionnaires used in primary care — asked directly, including the question about self-harm
A full medication, alcohol, and substance history, opioids specifically
Sleep history, including snoring and witnessed apnoeas
Examination, including testicular size, body hair, and breast tissue
Morning fasting bloods, repeated, with LH, FSH, prolactin, thyroid function, and a full blood count
A plan for both possibilities, not a bet on one

Talk to us

If the symptoms above are familiar, the useful next step is a real evaluation rather than a mail-order lab panel.

Medical disclaimer

This article is general health information, not medical advice for any individual, and it is not a recommendation to start or stop any treatment. Depression is a medical condition that requires assessment and treatment in its own right. If you have thoughts of suicide or self-harm, call or text 988 in the United States or go to an emergency department immediately.