Low Testosterone and Depression in Men: Symptoms, Mental Health, and Testosterone Replacement Therapy

When a man comes to psychiatry saying, “I don't feel like myself anymore,” the symptoms may sound like depression.

He may feel exhausted.His motivation may be gone.He may have difficulty concentrating.He may be more irritable than usual.He may have stopped enjoying things he once enjoyed.His sex drive may have declined.He may be sleeping poorly and struggling to keep up with work, relationships, or everyday responsibilities.

These symptoms can certainly occur with depression and anxiety, but they can also occur with low testosterone and other medical or hormonal conditions.

This is one reason a comprehensive approach to men's mental health matters.

At The Alchemy Institute, we believe psychiatric symptoms deserve to be evaluated in the context of the whole person. Hormones are not the explanation for every mental health symptom, but they can be one piece of the puzzle.

What Is Testosterone?

Testosterone is an androgen hormone produced primarily by the testes in men. It plays important roles in sexual development and function, muscle and bone health, red blood cell production, body composition, and reproductive health.

Testosterone also interacts with systems involved in mood, energy, cognition, and emotional well-being.

Testosterone levels naturally change throughout life, but aging alone does not automatically mean that a man has testosterone deficiency or needs testosterone replacement therapy.

Current clinical guidelines emphasize that hypogonadism should be diagnosed when a man has compatible symptoms and consistently low testosterone levels confirmed with appropriate testing.

Can Low Testosterone Look Like Depression?

Yes, there can be significant overlap.

Men with testosterone deficiency may experience:

• Low energy

• Reduced motivation

• Depressed mood

• Irritability

• Difficulty concentrating

• Decreased sex drive

• Erectile dysfunction

• Reduced physical strength

• Loss of muscle mass

• Sleep difficulties

• Reduced sense of well-being

The Endocrine Society specifically lists reduced energy, irritability, difficulty concentrating, and depressed mood among possible symptoms of hypogonadism.

The challenge is that these symptoms are not specific to low testosterone.

Depression can cause them.

So can anxiety, chronic stress, insomnia, sleep apnea, thyroid dysfunction, medication effects, substance use, chronic illness, nutritional deficiencies, relationship stress, and many other conditions.

This is why simply seeing “low motivation” or “fatigue” does not tell us what the underlying problem is.

When Depression Isn't the Whole Story

Consider a man who says:

“I'm exhausted all the time. I don't want to do anything. My sex drive is gone. I'm having trouble concentrating, and I just don't feel like myself.”

It would be reasonable to evaluate for depression.

But it would also be reasonable to ask:

• How long has this been happening?

• Has his libido changed?

• Has he noticed erectile changes?

• Has he lost muscle mass or strength?

• How is he sleeping?

• Does he snore or have symptoms of sleep apnea?

• What medications is he taking?

• Has his weight changed?

• What is his exercise pattern?

• Does he have diabetes or other chronic medical conditions?

• Has he been under significant stress?

• What does his thyroid function look like?

• Has his testosterone actually been measured?

• If it was low, was it repeated appropriately?

This is the difference between simply labeling symptoms and trying to understand what may be contributing to them.

Low Testosterone and Mental Health Can Coexist

It's also important to recognize that this isn't necessarily an either/or situation.

A man can have:

Depression + low testosterone.

Or:

Anxiety + low testosterone.

Or:

Poor sleep + low testosterone + depression.

Or:

Chronic stress + metabolic health concerns + hormonal changes + anxiety.

Mental health and physical health are interconnected.

A hormonal abnormality does not invalidate a psychiatric diagnosis, and a psychiatric diagnosis does not mean that physical contributors should be ignored.

Does Testosterone Replacement Therapy Treat Depression?

This is where nuance matters.

Testosterone replacement therapy (TRT) is a medical treatment for appropriately diagnosed testosterone deficiency. It is not a general treatment for depression or a treatment simply because a man feels tired or unmotivated.

Studies of men with testosterone deficiency have demonstrated improvements in depressive symptoms with testosterone therapy, although the clinical significance of those improvements can vary. The evidence is less conclusive for outcomes such as energy, fatigue, cognition, and overall quality of life.

That means TRT may help some appropriately diagnosed men, but it should not automatically replace evidence-based treatment for depression.

If someone meets criteria for major depressive disorder, that deserves appropriate psychiatric evaluation and treatment.

At the same time, if a man has symptoms suggestive of testosterone deficiency and consistently low testosterone, treating only the psychiatric symptoms without considering the hormonal deficiency may leave an important contributor unaddressed.

What Does Testosterone Replacement Therapy Involve?

Testosterone replacement therapy can be delivered in several forms, including:

• Injections

• Topical gels or solutions

• Patches

• Buccal formulations

• Pellets

• Nasal testosterone

The appropriate option depends on the individual's medical history, preferences, treatment goals, fertility plans, cost, and other factors.

TRT should be medically supervised with appropriate follow-up and laboratory monitoring.

It is not the same thing as using testosterone for bodybuilding, athletic performance, or simply trying to optimize a normal testosterone level.

Testosterone Testing Matters

One of the biggest problems in conversations about testosterone is assuming that one laboratory value tells the whole story.

Testosterone levels fluctuate, and testing conditions matter. Accurate testing and confirmation with repeat morning testosterone measurements before diagnosing hypogonadism, as symptoms such as low energy, libido changes, and mood changes have many possible causes.

In other words: A low testosterone level deserves context.

And a normal testosterone level also deserves context.

What Can Cause Low Testosterone?

Testosterone deficiency can have many potential causes.

These may include problems involving the testes or the hormonal signaling between the brain and testes. Certain medications, chronic medical conditions, obesity, sleep disorders, and other health conditions can also contribute.

This is why identifying why testosterone is low is important.

For example, if a man has obesity or a significant sleep disorder contributing to hormonal dysfunction, simply prescribing testosterone may not address the underlying issue. Some contributors, including obesity, may be reversible and should be addressed when appropriate.

What About Testosterone and Fertility?

This is an especially important conversation for men who may want children.

Exogenous testosterone can suppress sperm production. Men who are planning future fertility should discuss this before starting testosterone therapy.

A man should not assume that testosterone replacement is simply another form of a fertility-supporting hormone treatment.

If fertility is a goal, the treatment strategy may be very different.

Testosterone Isn't Automatically Safe Just Because It's a Hormone

Testosterone replacement therapy can be appropriate and beneficial for men with confirmed hypogonadism, but it is still a medical treatment with potential risks and monitoring requirements.

Before treatment, clinicians may evaluate factors such as:

• Hemoglobin and hematocrit

• Prostate health and PSA when appropriate

• Fertility plans

• Sleep apnea

• Cardiovascular history

• Medications

• Underlying causes of testosterone deficiency

Baseline hemoglobin and hematocrit testing is required because testosterone therapy can increase the risk of polycythemia.

A Functional Mental Health Perspective for Men

A functional approach to mental health does not mean assuming every psychiatric symptom is caused by a hormone imbalance.

Instead, it means asking a broader question:

What could be contributing to this person's symptoms?

For men experiencing depression, anxiety, fatigue, brain fog, low motivation, or irritability, that may involve looking at:

• Testosterone and reproductive hormones

• Thyroid function

• Sleep quality and sleep apnea

• Nutrition

• Metabolic health

• Medications

• Alcohol and substance use

• Chronic illness

• Exercise and physical activity

• Stress physiology

• Relationships

• Work and environmental stress

• Trauma

• Depression and anxiety

• Other psychiatric conditions

The goal is not to replace psychiatric care with hormone treatment.

The goal is integration.

When Should a Man Consider Having His Testosterone Checked?

Testing may be worth discussing with a healthcare professional when symptoms suggest testosterone deficiency, particularly when symptoms such as decreased libido, erectile dysfunction, reduced energy, depressed mood, difficulty concentrating, or changes in muscle mass occur together.

However, testosterone testing isn't recommended as a blanket screening test for every asymptomatic man.

If a man is experiencing significant changes in mood, motivation, energy, cognition, or sexual function, a comprehensive evaluation can help determine what may be contributing.

Your Mental Health Is More Than a Diagnosis

Men are sometimes taught to ignore changes in energy, mood, motivation, sexual function, or emotional well-being.

They may assume they're simply getting older.

They may blame themselves for being unmotivated.

They may be told they're depressed and prescribed medication without exploring potential physical contributors.

Or, on the opposite end of the spectrum, they may be told that testosterone is the answer to everything.

Neither approach tells the whole story.

Depression is real.

Hormonal health matters.

Sleep matters.

Metabolic health matters.

Relationships matter.

Stress matters.

And sometimes several of these things are happening at the same time.

At The Alchemy Institute, our approach to functional mental health is centered on understanding the whole person, not simply treating an isolated symptom or laboratory value.

Because when a man says, “I don't feel like myself,” the most useful question may not be simply:

“What psychiatric diagnosis does he have?”

It may also be:

“What is happening in his brain, body, hormones, sleep, and life that could be contributing to how he feels?”

Testosterone Therapy for Women

Testosterone isn't only relevant to men's health. Testosterone also plays an important role in women's health, and in certain circumstances, testosterone therapy may be an appropriate treatment option for women. Research and clinical guidelines support considering testosterone therapy in specific situations, such as hypoactive sexual desire disorder (HSDD) in appropriately evaluated postmenopausal women. Treatment should be individualized and medically monitored, with attention to dosing, potential benefits, risks, and the individual's overall health.

A Note About Gender-Affirming Language

Throughout this article, we use the terms “men” and “women” in reference to biological sex and the clinical context of testosterone physiology and hormone therapy. We recognize that gender identity and biological sex are not synonymous and strive to provide care that is respectful, inclusive, and affirming of each person's gender identity.

At The Alchemy Institute, we take a whole-person approach to hormonal and mental health. If you are a woman experiencing changes in mood, energy, motivation, cognition, libido, or overall well-being, hormonal health may be one part of a comprehensive evaluation. To get started, you can fill out our brief intake form thealchemy-institute.com/intake-form