Signs and symptoms of low testosterone

Dr James Greenwood 

MBCHB, MRCGP

TRT Doctor

Low testosterone (also called low T or testosterone deficiency) can creep in quietly. Feeling more tired than usual, struggling to focus, losing interest in sex, or noticing weight gain around the middle? You’re not alone.

At Leger Clinic, our expert TRT doctors help men across the UK identify low testosterone and explore safe, medically supervised treatment options.

Jump to: What is Testosterone and Why It Matters | Nine Common Signs of Low Testosterone | How to Check Testosterone Levels in the UK | What Causes Low Testosterone? | How TRT Can Help | Could I Have Low Testosterone? | Next Steps: Testing & Treatment Safely | FAQ

What is Testosterone and Why It Matters

Testosterone is a key male hormone, affecting sex drive, energy, mood, muscle mass, bone density, and more. Levels naturally decline after your late 30s or early 40s, but for some men, this drop becomes significant enough to cause symptoms.

Keywords: low testosterone, testosterone deficiency, low T, men’s hormone replacement therapy

Nine Common Signs of Low Testosterone

Not all men experience the same symptoms. Common signs include:

1. Low sex drive — less interest in intimacy
2. Erectile dysfunction — harder to get or maintain erections
3. Fatigue — persistent tiredness despite rest
4. Loss of muscle mass — training may feel less effective
5. Increased belly fat — often linked to dropping T levels
6. Mood swings — low T can cause anxiety, irritability, low mood
7. Poor concentration — forgetfulness and brain fog
8. Thinning hair — body or facial hair loss
9. Fragile bones — long-term low testosterone may reduce bone density

Take the Low Testosterone Quiz

How to Check Testosterone Levels in the UK

A blood test taken in the early morning gives the most accurate results. Leger Clinic combines blood tests, symptom tracking, and lifestyle review to confirm low testosterone.

What Causes Low Testosterone?

• Age: Natural decline after 30s–40s
• Medical conditions: Issues with testes or pituitary gland
• Lifestyle factors: Stress, alcohol, poor sleep, being overweight
• Medications: Certain prescriptions may affect hormone levels

How TRT Can Help

If two blood tests confirm low testosterone, TRT (testosterone replacement therapy) may be an option. Done under medical supervision, TRT can:

• Improve mood & mental clarity
• Increase energy & motivation
• Enhance sex drive & erections
• Build lean muscle & strengthen bones
• Improve sleep & recovery

Could I Have Low Testosterone?

Feeling flat, low in energy, or “not yourself”? Don’t ignore it. Use our ADAM questionnaire, check your testosterone levels, and speak to an expert doctor in the UK.

Next Steps: Testing & Treatment Safely

• Take a home testosterone test or visit a clinic
• Review results with a qualified doctor
• Explore medically supervised TRT if appropriate
• Monitor your progress regularly

FAQ

• Q: What are the signs of low testosterone?
  A: Low sex drive, fatigue, mood swings, muscle loss, increased belly fat, and erectile dysfunction are common signs.
• Q: How can I check testosterone levels at home?
  A: You can order a medically approved home testosterone blood test, or get tested at a UK clinic.
• Q: Is TRT safe in the UK?
  A: When done under medical supervision, TRT is safe and effective for men with confirmed low testosterone.
• Q: How do I get TRT in the UK?
  A: Book a consultation with a licensed TRT doctor, complete blood tests, and discuss the right therapy for your needs.