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The Basics: Recognising The Symptoms of Low Testosterone

| By: Dr Robert Stevens

Testosterone is a vital hormone that plays a key role in male health, affecting mood, cognition, energy levels, libido, metabolism, and overall well-being. A decline in testosterone can have significant consequences, leading to a cascade of symptoms that impact daily life. Recognising these signs is the first step toward restoring balance and optimising health.


Cognitive and Emotional Symptoms:

Brain Fog & Memory Issues

Testosterone has neuroprotective properties and supports cognitive function. Low levels can result in poor concentration, memory lapses, and difficulty processing information.

Mood Swings & Irritability

Testosterone helps regulate mood. Testosterone Deficiency is associated with increased irritability, frustration, and heightened emotional sensitivity. Alarmingly, patients have reported suicidal ideation prior to TRT.

Depression & Anxiety

There is a strong correlation between low testosterone and depressive symptoms. Men may experience feelings of sadness, low self-worth, low self-esteem, and increased anxiety.

Lack of Motivation & Drive

Testosterone is linked to ambition, confidence, and competitiveness. Low levels can lead to a loss of motivation and reduced enthusiasm for life.


Physical Symptoms:

Fatigue & Low Energy

Testosterone is essential for cellular energy production. Men with low levels often report persistent tiredness, even after adequate sleep and rest.

Reduced Muscle Mass & Strength

Testosterone supports muscle protein synthesis. A decline in levels can lead to muscle loss, decreased strength, and reduced exercise performance.

Increased Body Fat

Hormonal imbalance can contribute to fat accumulation, particularly around the abdomen. This is due to an altered testosterone-to-oestrogen ratio, leading to increased visceral fat storage.

Decreased Bone Density

Testosterone is crucial for bone health and strength. Low levels increase the risk of osteopenia and osteoporosis, making bones more fragile and susceptible to fractures.

Hair Loss

While testosterone plays a role in hair growth, a deficiency can lead to thinning hair or reduced facial and body hair.


Sexual Symptoms:

Low Libido

Testosterone is a key driver of sexual desire. Men with low levels often experience a significant reduction in libido.

Erectile Dysfunction

Testosterone influences nitric oxide production, which is necessary for achieving and maintaining erections. Low levels may lead to weaker or less frequent erections.

Reduced Ejaculate Volume

Testosterone is involved in sperm production, prostate health and seminal fluid output. A deficiency may result in decreased semen volume.


Recognising & Addressing Low Testosterone

If you are experiencing any of the above symptoms, it is important to consider a clinical assessment. A comprehensive blood test can determine testosterone levels and identify potential underlying causes. With appropriate medical guidance, lifestyle adjustments, and, if necessary, Testosterone Replacement Therapy (TRT), it is possible to restore balance and regain optimal well-being.

The Men’s Health Clinic specialises in diagnosing and managing testosterone deficiency. Our patient-centred approach ensures tailored treatment plans to help you feel your best.


You can find more information about Testosterne Deficiency and the signs of low testosterone here.

This article was written by

Dr. Robert Stevens

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Dr. Robert Stevens is a UK-trained GP with a special interest in men’s health and hormone optimisation. After earning his medical degree from Sheffield Medical School in 1997, he became a Member of the Royal College of General Practitioners in 2010. Motivated by personal experience and a commitment to holistic, preventative care, he founded The Men’s Health Clinic in 2016—pioneering a patient-centred approach to Testosterone Replacement Therapy (TRT). His focus spans lifestyle, nutrition, exercise, and hormonal balance, and he also qualified as a personal trainer to better integrate fitness with medical practice. A recognised advocate for improving awareness and treatment of testosterone deficiency in the UK, Dr. Stevens continues to push for higher standards in men’s health. Outside of medicine, he enjoys weightlifting, endurance events, and exploring the outdoors with his two loyal German Shepherds.