Low Testosterone in Men: Symptoms, Causes, and What Nurses Need to Know

Testosterone is often called the male hormone, but it plays essential roles in both men and women. From muscle and bone health to mood, energy, and cardiovascular function, this powerful hormone affects far more than most people realize.

Low Testosterone in Men & Women: Nursing Student review: Symptoms, Causes, and treatments.

What is this Testosterone stuff anyway?

When most people hear the word testosterone, they often think of muscle growth, athletic performance, or masculinity. However, testosterone is far more complex than that.

Testosterone is a vital hormone that influences nearly every organ system in the body. It plays important roles in physical development, energy production, mood regulation, reproductive health, bone density, muscle maintenance, red blood cell production, and sexual function.

While testosterone is often called the "male sex hormone," it is important to remember that women also produce testosterone and rely on it for normal physiological function.

For nursing students and healthcare professionals, understanding testosterone is essential because hormonal imbalances can affect cardiovascular health, mental health, metabolism, reproductive function, and overall quality of life.

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Testosterone is more than a hormone linked to masculinity. It acts as a powerful chemical messenger that influences muscle growth, bone strength, energy levels, mood, cardiovascular health, and overall well-being in both men and women.

What Is Testosterone?

Testosterone is a steroid hormone belonging to a group of hormones called androgens.

Hormones act as chemical messengers that travel through the bloodstream and influence the activity of tissues and organs throughout the body.

Testosterone is responsible for many of the physical characteristics commonly associated with males, but its effects extend far beyond appearance.

Testosterone helps regulate:

• Muscle growth and maintenance

• Bone density

• Red blood cell production

• Sexual development

• Libido (sex drive)

• Fertility

• Mood and emotional regulation

• Energy levels

• Cognitive function

Without adequate testosterone, multiple body systems can be affected.

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Testosterone production begins in the brain and ends in the testes. This carefully regulated hormone pathway, known as the Hypothalamic-Pituitary-Gonadal (HPG) Axis, helps maintain healthy testosterone levels throughout life.

Where Is Testosterone Produced?

In Men

Approximately 95% of testosterone is produced in the testes by specialized cells called Leydig cells.

The remaining amount is produced by the adrenal glands located above the kidneys.

The Production Pathway

The body carefully regulates testosterone production through the:

Hypothalamic-Pituitary-Gonadal (HPG) Axis

1. The hypothalamus releases Gonadotropin-Releasing Hormone (GnRH)

2. The pituitary gland releases Luteinizing Hormone (LH)

3. LH stimulates the Leydig cells of the testes

4. The testes produce testosterone

This system functions through a negative feedback loop to maintain hormone balance.

Women produce testosterone throughout their lives. While levels are lower than in men, testosterone is produced by the ovaries, adrenal glands, and peripheral tissues, where it supports energy, mood, muscle strength, bone health, and overall well-being.

In Women

Women produce testosterone as well, although in significantly smaller amounts.

Testosterone is produced by:

• The ovaries

• The adrenal glands

• Peripheral conversion of other hormones

Although levels are lower than in men, testosterone remains important for:

• Libido

• Bone strength

• Muscle mass maintenance

• Mood stability

• Energy production

This is an important concept for nursing students because hormonal disorders can occur in both sexes.

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What Does Testosterone Do During Puberty?

One of testosterone's most recognizable roles is guiding male puberty.

As testosterone levels increase during adolescence, physical changes begin to occur:

• Deepening of the voice

• Growth of facial hair

• Increased body hair

• Enlargement of the penis and testes

• Increased muscle mass

• Growth spurts

• Increased bone density

These changes are examples of secondary sexual characteristics.

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Testosterone's Effects Throughout Adulthood

After puberty, testosterone continues to support normal body function.

Musculoskeletal System

Testosterone promotes:

• Protein synthesis

• Muscle maintenance

• Bone mineral density

Low testosterone can contribute to:

• Muscle loss

• Weakness

• Osteopenia

• Osteoporosis

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Cardiovascular System

Testosterone helps stimulate red blood cell production.

This occurs through increased erythropoietin activity and bone marrow stimulation.

Patients with low testosterone may sometimes develop:

• Fatigue

• Reduced exercise tolerance

• Mild anemia

However, excessively high testosterone levels can increase blood viscosity and may increase cardiovascular risks.

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Brain and Mental Health

Testosterone receptors exist throughout the brain.

Healthy testosterone levels are associated with:

• Motivation

• Energy

• Confidence

• Mood regulation

• Cognitive performance

Low testosterone has been associated with:

• Depression

• Fatigue

• Irritability

• Difficulty concentrating

• Reduced motivation

For nursing students, it is important to recognize that hormonal disorders can sometimes mimic psychiatric conditions.

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Sexual and Reproductive Health

Testosterone contributes to:

• Libido

• Erectile function

• Sperm production

• Fertility

Low testosterone often presents with:

• Reduced sex drive

• Erectile dysfunction

• Reduced fertility

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What Is Low Testosterone?

Low testosterone, also known as hypogonadism, occurs when the body does not produce enough testosterone to meet physiological needs.

Diagnosis requires:

Symptoms PLUS Laboratory Testing

A testosterone level alone does not automatically diagnose hypogonadism.

Healthcare providers evaluate:

• Symptoms

• Medical history

• Physical examination

• Repeated laboratory testing

This concept is very similar to how hypotension is assessed:

Numbers alone do not tell the entire story.

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Low testosterone can affect far more than muscle mass. Symptoms such as fatigue, brain fog, low motivation, reduced strength, mood changes, and decreased libido are often overlooked or mistaken for normal aging, stress, or burnout.

Common Symptoms of Low Testosterone "Men"

Symptoms may include:

Physical Symptoms

• Fatigue

• Reduced muscle mass

• Increased body fat

• Reduced strength

• Reduced exercise capacity

• Decreased body hair

Emotional Symptoms

• Depression

• Irritability

• Reduced motivation

• Brain fog

• Difficulty concentrating

Sexual Symptoms

• Low libido

• Erectile dysfunction

• Reduced fertility

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Many people are surprised to learn that women produce testosterone too. Although levels are lower than in men, testosterone plays an important role in energy, mood, muscle strength, bone health, cognitive function, and sexual well-being throughout a woman's life.

Common Symptoms of Low Testosterone in "Women"

Although women naturally produce much lower amounts of testosterone than men, this hormone remains important for normal physical, emotional, and sexual health.

Low testosterone in women may occur due to:

• Natural aging

• Menopause

• Surgical removal of the ovaries

• Adrenal gland disorders

• Pituitary disorders

• Certain medications

• Chronic illness

Unlike men, there is no universally accepted definition of "low testosterone" in women, making clinical assessment particularly important.

Physical Symptoms

Women experiencing low testosterone may report:

• Persistent fatigue

• Reduced stamina

• Loss of muscle mass

• Reduced exercise performance

• Increased body fat

• Decreased bone density

• Reduced physical strength

These symptoms may develop gradually and are often attributed to aging or lifestyle factors.

Emotional and Cognitive Symptoms

Testosterone also affects brain function and emotional well-being.

Women with low testosterone may experience:

• Reduced motivation

• Difficulty concentrating

• Brain fog

• Mood changes

• Increased irritability

• Reduced sense of well-being

For nursing students, it is important to recognize that hormonal imbalances can sometimes present similarly to anxiety, depression, chronic stress, or burnout.

Sexual Health Symptoms

One of the most commonly reported effects of low testosterone in women is a reduction in sexual desire.

Symptoms may include:

• Reduced libido

• Decreased sexual satisfaction

• Reduced arousal

• Lower overall interest in intimacy

These symptoms can affect relationships, emotional well-being, and overall quality of life.

Nursing Considerations

When assessing female patients, healthcare providers should remember that fatigue, mood changes, decreased strength, and reduced libido may have multiple causes.

A comprehensive assessment may include evaluation of:

• Hormonal status

• Menopausal symptoms

• Thyroid function

• Mental health

• Lifestyle factors

• Medication history

Just as in men, testosterone levels alone do not tell the whole story. Clinical symptoms, patient history, and overall health must all be considered when evaluating hormonal concerns.

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Causes of Low Testosterone

Primary Hypogonadism

The testes cannot produce sufficient testosterone.

Examples include:

• Genetic disorders

• Testicular injury

• Chemotherapy

• Radiation therapy

Secondary Hypogonadism

The brain fails to adequately stimulate testosterone production.

Examples include:

• Pituitary disorders

• Hypothalamic disorders

• Certain medications

• Chronic illness

Lifestyle Factors

Several modifiable factors may contribute to lower testosterone levels:

• Obesity

• Poor sleep

• Chronic stress

• Excessive alcohol consumption

• Sedentary lifestyle

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What About Testosterone Replacement Therapy (TRT)?

Testosterone Replacement Therapy may be appropriate for some patients diagnosed with symptomatic hypogonadism.

Potential benefits may include:

• Improved energy

• Improved libido

• Increased muscle mass

• Better mood

• Improved quality of life

However, TRT is not risk-free.

Potential concerns include:

• Elevated hematocrit

• Polycythemia

• Acne

• Fertility reduction

• Sleep apnea worsening

• Cardiovascular considerations

Careful monitoring is essential.

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Why This Matters

Nursing students often encounter patients experiencing fatigue, depression, weakness, reduced exercise tolerance, sexual dysfunction, or unexplained mood changes.

While these symptoms may have many causes, hormonal imbalances should always be considered as part of a comprehensive assessment.

Understanding testosterone helps nurses recognize how the endocrine system influences multiple body systems and reminds us that hormones can affect far more than reproductive health alone.

Whether caring for men or women, healthcare professionals who understand hormone physiology are better equipped to identify problems, educate patients, and support healthier outcomes.

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Continue your learning: build clinical knowledge, recognize symptoms, respond effectively, and master life-saving skills through nursing education at Saving Grace Medical Academy.

Continuing Education: Would You Like to Know More?

Understanding testosterone requires an understanding of how hormones, mental health, cardiovascular health, and overall wellness interact throughout the body. Expand your knowledge with these related articles from Saving Grace Medical Academy:

❤️ Cardiovascular Health

• What Is Hypotension? Understanding Low Blood Pressure and Perfusion Learn how blood pressure affects organ perfusion and why symptoms often matter more than numbers alone.

• Cardiac Output Explained: The Formula Every Nursing Student Should Know - Discover how the heart, blood vessels, and circulatory system work together to deliver oxygen and nutrients throughout the body.

🧠 Mental Health and Wellness

• Men's Mental Health by the Numbers: Understanding the Statistics Explore the unique mental health challenges affecting men and why early recognition and support matter.

• Caregiver Burnout: Recognizing Compassion Fatigue Before It Takes Hold Learn how chronic stress affects physical and emotional health, and why self-care is essential for healthcare providers and caregivers.

⚖️ Metabolism and Lifestyle

• Fasting and Autophagy: What Happens When the Body Switches Gears? Understand how hormones, metabolism, and cellular repair processes adapt during periods of fasting.

🫁 Oxygen and Physiology

• Hyperoxia and Coronary Arteries: When Too Much Oxygen Becomes a Problem Explore how oxygen therapy affects circulation, cardiac function, and overall patient outcomes.

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Case Scenario

A 48-year-old male presents to his primary care provider complaining of fatigue, decreased motivation, reduced libido, and difficulty maintaining muscle mass despite regular exercise.

His symptoms have gradually worsened over the past year.

Question:

Which of the following would be the most appropriate next step?

A. Start testosterone immediately

B. Recommend over-the-counter testosterone supplements

C. Obtain a comprehensive assessment including laboratory testing

D. Assume symptoms are part of normal aging

Answer: C

Symptoms alone are not sufficient to diagnose hypogonadism. A comprehensive assessment including laboratory testing is required before treatment decisions are made.

Knowledge Check

1. Where is most testosterone produced in males?

A. Adrenal glands

B. Liver

C. Testes

D. Thyroid gland

Answer: C

2. Women produce testosterone.

A. True

B. False

Answer: A

3. Which symptom may be associated with low testosterone?

A. Fatigue

B. Reduced libido

C. Decreased muscle mass

D. All of the above

Answer: D

4. Low testosterone is diagnosed using:

A. Symptoms alone

B. One blood test alone

C. Symptoms and clinical evaluation with laboratory testing

D. Age alone

Answer: C

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Medical Disclaimer

This article is intended for educational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Individuals experiencing symptoms that may be related to hormonal imbalances should consult a qualified healthcare provider for assessment and guidance.

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Author - Saving Grace Medical Academy Ltd

Grace. T

Medical Content Writer