The prostate is a small gland, roughly the size and shape of a walnut, that forms part of the male reproductive system. It is located deep inside the pelvis, situated just below the bladder and in front of the rectum. Its primary role is to produce a thick, white fluid that mixes with sperm from the testicles to create semen. Because the urethra (the tube that carries urine and semen out of the body) passes directly through the centre of the prostate, any changes in the gland’s size or health can significantly affect both urinary and sexual function.
What We Will Cover in This Article
- The anatomical location and size of the prostate gland
- The primary functions of prostatic fluid in reproduction
- How the prostate changes as men get older
- The relationship between the prostate and the urinary system
- Common conditions: BPH, Prostatitis, and Prostate Cancer
- Identifying early symptoms of a prostate issue
- When to speak to your GP about prostate health
The Primary Functions of the Prostate
The prostate is an exocrine gland, meaning it secretes fluids through ducts. Its most vital function is the production of prostatic fluid, which makes up about 30% of the total volume of semen. This fluid is not just a ‘carrier’ for sperm; it is biologically designed to protect and nourish them.
The fluid produced by the prostate is slightly alkaline, which helps to neutralise the acidic environment of the vaginal tract, ensuring the survival of sperm. It also contains enzymes, such as Prostate-Specific Antigen (PSA), which help to liquefy semen after ejaculation, allowing sperm to swim more freely toward an egg. Without a functioning prostate, natural male fertility would be significantly compromised.
How the Prostate Changes with Age
It is a biological fact that the prostate gland grows as men get older. For most men, this growth is a normal part of ageing and is driven by hormonal changes. In early adulthood, the prostate is about the size of a walnut, but by the age of 40 or 50, it may have grown to the size of a golf ball or even a lemon.
- ‘Prostate growth is a near-universal experience for men as they age. While this growth is often harmless, because the gland surrounds the urethra, its enlargement can eventually begin to squeeze the tube, leading to the common urinary symptoms associated with older age.’
In the UK, the most common type of non-cancerous growth is called Benign Prostatic Hyperplasia (BPH). While BPH is not cancerous and does not increase the risk of cancer, it can cause significant bother by making it harder to pass urine or causing a frequent, urgent need to use the toilet at night.
Common Prostate Conditions
Because the prostate is sensitive to both hormones and inflammation, there are three primary conditions that GPs and urologists commonly monitor.
| Condition | What it is | Common Symptoms |
| BPH | Non-cancerous enlargement | Weak flow, frequent urination at night |
| Prostatitis | Inflammation or infection | Pain in the pelvis, stinging when peeing |
| Prostate Cancer | Malignant cell growth | Often no early symptoms; later urinary changes |
It is important to note that many symptoms of these three conditions overlap. For example, a weak urine stream can be a sign of both BPH and prostate cancer. This is why the NHS recommends that any man with new urinary symptoms should have a professional review to determine the exact cause.
Differentiation: Normal Ageing vs. Clinical Concern
Distinguishing between a ‘normal’ ageing prostate and a condition that requires treatment is a key part of men’s health.
| Feature | Normal Ageing / Mild BPH | Clinical Concern (e.g. Cancer/Infection) |
| Urine Flow | Becomes gradually slower over years | Sudden change or complete blockage |
| Pain | Usually painless | Pain in the back, hips, or pelvic floor |
| Blood | Never normal in urine or semen | Blood in urine (haematuria) is a ‘red flag’ |
| Systemic Signs | No fever or weight loss | Unexplained weight loss or fever |
To Summarise
The prostate is a small but vital gland located at the crossroads of the male reproductive and urinary systems. Its primary role is to nourish and protect sperm, but because of its location surrounding the urethra, its natural growth over time can lead to urinary changes. While most prostate changes as men age are benign, understanding the gland’s function and monitoring for ‘red flag’ symptoms like blood in the urine or pelvic pain is essential for long-term health. Regular checks and an awareness of how your body changes are the best tools for maintaining a healthy prostate.
If you experience severe, sudden, or worsening symptoms, such as a complete inability to pass urine, call 999 immediately.
Where exactly is the prostate?
It is located inside the pelvis, tucked between the base of the bladder and the rectum.
Does a high PSA level always mean cancer?
No, PSA can be raised by many things, including BPH, a recent infection, or even heavy exercise and cycling.
At what age should I start worrying about my prostate?
The NHS does not have a formal screening programme, but men over 50 (or over 45 if you are Black or have a family history) should be aware of any changes.
Can the prostate affect sex drive?
The prostate itself doesn’t control libido, but conditions like prostatitis or the side effects of certain prostate medications can impact sexual function.
What is a ‘Digital Rectal Examination’ (DRE)?
It is a quick, simple check where a doctor feels the prostate through the wall of the rectum to check its size and texture.
Can women have a prostate?
Women do not have a prostate gland, though they have ‘Skene’s glands’ which are sometimes referred to as the female prostate due to similar functions.
Does diet affect prostate health?
Some research suggests a diet rich in lycopene (found in cooked tomatoes) and low in red meat may support prostate health, but more evidence is needed.
Authority Snapshot
This article was reviewed by Dr. Stefan Petrov, a UK-trained physician with experience in general medicine, surgery, and emergency care. Dr. Petrov holds an MBBS and has worked extensively in hospital settings, including urological and surgical wards. The content aligns with the latest health standards from the NHS and Prostate Cancer UK, ensuring the information provided is evidence-based and safe for the public.
