The Link Between Testosterone and Prostate Cancer

The relationship between testosterone and prostate cancer has been debated in medical research for decades. Understanding how hormone levels may relate to prostate health is an important step for men who wish to take a proactive approach to their wellbeing. If you’re looking for a foundational overview of the condition, our article on prostate cancer symptoms, stages, and treatment is a helpful starting point.

What Is Testosterone and Why Does It Matter for Prostate Health?

Testosterone is the primary male sex hormone, produced mainly in the testes. It plays a central role in regulating muscle mass, bone density, red blood cell production, fat distribution, and reproductive function. Testosterone levels naturally fluctuate throughout life, typically peaking in early adulthood and gradually declining after the age of 30.

The prostate gland is highly sensitive to hormonal signals — particularly testosterone and its more potent derivative, dihydrotestosterone (DHT). Because prostate cells rely on androgens for growth and function, researchers have long investigated whether testosterone levels may influence prostate cancer risk. For a broader look at hormonal testing, read our guide on hormone blood tests and understanding hormone levels.

Does Testosterone Cause Prostate Cancer?

This is one of the most frequently asked questions in men’s health — and the answer is more nuanced than many assume.

Historically, it was believed that higher testosterone levels directly increased prostate cancer risk. However, more recent and larger-scale studies have challenged this view. Current evidence suggests that:

• Normal physiological levels of testosterone do not appear to significantly increase prostate cancer risk in most men
• The “saturation model” proposes that prostate tissue becomes saturated with androgens at relatively low testosterone concentrations
• Some research has indicated that very low testosterone levels may be associated with more aggressive forms of prostate cancer
• The relationship is likely multifactorial, involving genetics, age, ethnicity, lifestyle, and other hormonal interactions

Testosterone vs PSA: Understanding Key Prostate Biomarkers

When it comes to prostate health screening, two blood markers are particularly relevant:

Neither marker alone can confirm or rule out prostate cancer. An elevated PSA level may indicate benign prostatic hyperplasia (BPH), infection, or inflammation — not necessarily cancer.

Who Should Consider Testosterone and Prostate Screening?

• Men aged 50 and over — prostate cancer risk increases significantly with age
• Men aged 45 and over with a family history of prostate cancer
• Black men aged 45 and over — higher statistical risk
• Men experiencing symptoms such as difficulty urinating, increased frequency, or unexplained fatigue
• Men concerned about declining testosterone — reduced energy, low mood, decreased libido
• Men seeking a baseline health assessment

For more detail on when to begin and how frequently to test, see our guide on when to start annual PSA testing in the UK.

How Often Should You Test?

• Baseline testing is often considered from age 45–50
• Annual monitoring may be appropriate for men with elevated risk factors
• Follow-up testing may be considered if previous results showed borderline levels
• Ad hoc testing if new symptoms develop or there is a change in health status

What Do Your Results Mean?

Testosterone Results:

• Within normal range: May suggest healthy hormonal function for your age group
• Below normal range: Can sometimes indicate hypogonadism or age-related decline
• Above normal range: Less commonly flagged but may warrant further evaluation

PSA Results:

• Within expected range for age: Generally reassuring
• Mildly elevated: Can sometimes suggest benign conditions such as BPH or prostatitis
• Significantly elevated or rising trend: May indicate the need for further investigation

Frequently Asked Questions