An enlarged prostate is an increase in the size of the prostate. It isn’t caused by cancer. The medical term for an enlarged prostate is benign prostatic enlargement (BPE).

  • Benign – non-cancerous.
  • Prostatic – to do with the prostate.
  • Enlargement – an increase in size.

You might also hear it called benign prostatic hyperplasia (BPH). Hyperplasia means an increase in the number of cells. It is this increase in cells that causes the prostate to grow (see diagram). In our information, we use the words 'enlarged prostate' to describe both BPE and BPH.

An enlarged prostate is very common in men over the age of about 50. Not all men with an enlarged prostate get symptoms. But as the prostate grows, it can press on the outside of the urethra, causing the urethra to become narrow. This can slow down or sometimes even stop the flow of urine when you try to urinate. It can also cause leaking.

About 1 in 3 men over the age of 50 have urinary symptoms. The most common cause of these symptoms is an enlarged prostate.

What causes an enlarged prostate?

We still don’t really know all the things that cause the prostate to grow. But we do know about two risk factors.


Your risk of having an enlarged prostate increases as you get older. Many men aged 50 or over have an enlarged prostate, but they don’t all get symptoms. And many men who do get symptoms aren’t really bothered by them.

Hormone levels

The balance of hormones in your body changes as you get older. This may cause your prostate to grow.

Other factors

Some studies show that obese men and men who have diabetes may be more likely to develop an enlarged prostate. Regular exercise may help to reduce your risk of urinary symptoms. But we still need more studies into the causes of enlarged prostate to know for certain if, and how, we can prevent it.

There is also some research that suggests you may be more at risk of developing an enlarged prostate if your father or brother has the condition. Again, further studies are needed to confirm this.

What are the symptoms?

An enlarged prostate is the most common cause of urinary symptoms in men as they get older. Possible symptoms include:

  • a weak flow when you urinate
  • a feeling that your bladder hasn’t emptied properly
  • difficulty starting to urinate
  • dribbling urine after you finish urinating
  • needing to urinate more often, especially at night
  • a sudden urge to urinate – you may sometimes leak before you get to the toilet.

You may not get all of these symptoms, and some men with an enlarged prostate don’t get any symptoms at all. These symptoms can also be caused by other things, such as cold weather, anxiety, other health problems, lifestyle factors, and some medicines. If you have any symptoms, visit your GP to find out what may be causing them.

Blood in your urine is rarely a symptom of an enlarged prostate and is usually caused by something else. Tell your doctor if you have blood in your urine.

Am I more likely to get prostate cancer if I have an enlarged prostate?

No, having an enlarged prostate doesn’t increase your risk of getting prostate cancer. The two problems usually begin in different parts of the prostate. But men can have an enlarged prostate and prostate cancer at the same time.

Localised prostate cancer (cancer that hasn’t spread outside the prostate) doesn’t usually cause any urinary symptoms. If you’re worried about prostate cancer, talk to your GP or call our Specialist nurses.

How might an enlarged prostate affect my life?

Having an enlarged prostate affects men in different ways. Some men can manage mild symptoms and don’t need treatment. Other men find they need to stay near a toilet. This can make it difficult to work, drive, be outdoors and attend social events. If you need the toilet a lot during the night, this can affect your sleep and make you feel more tired during the day.

Some men with an enlarged prostate find their symptoms improve over time without treatment. But for most, the symptoms will stay the same or slowly start to cause more problems over time.

What other problems might an enlarged prostate cause?

A small number of men may find it difficult to empty their bladder properly – this is called urine retention. If you’ve been diagnosed with an enlarged prostate, your doctor will look at your test results to see if you’re at risk of urine retention. You may be more likely to get urine retention if:

  • you’re aged 70 or over
  • your prostate is very large
  • you have a raised prostate specific antigen (PSA) level
  • you have severe urinary symptoms and a very slow flow.

Chronic urine retention

This is where you can’t empty your bladder fully, but can still urinate a little. It usually develops slowly over time. Chronic means long-lasting. The first signs often include a weak flow when you urinate, or leaking urine at night. You may feel that your abdomen (stomach area) is swollen, or that you’re not emptying your bladder fully.

Chronic urine retention is usually painless. But the pressure of the urine can slowly stretch your bladder muscle and make it weaker. This can cause urine to be left behind in the bladder when you urinate. If you don’t empty your bladder fully, you might get a urine infection, need to urinate more often, leak urine at night, or get painful bladder stones. You might also see some blood in your urine. Chronic urine retention can damage your bladder and kidneys if it isn’t treated.

There are several treatments for chronic urine retention, including:

  • passing a thin, flexible tube called a catheter to drain urine from your bladder
  • surgery to widen the urethra.

Acute urine retention

This is when you suddenly and painfully can’t urinate – it needs treating straight away. If this happens, call your doctor or nurse, or go to your nearest accident and emergency (A&E) department. They may need to drain your bladder using a catheter. Before the catheter is removed, you may be offered a medicine called an alpha-blocker. This can help stop you getting acute retention again.

How is an enlarged prostate diagnosed?

Some tests for an enlarged prostate can be done at your GP surgery. Your GP might also arrange for you to see a doctor who specialises in urinary problems (a urologist) or a specialist nurse at the hospital.

Read our information on diagnosing an enlarged prostate.

What are the treatment options?

There are three main types of treatment for an enlarged prostate:

  • lifestyle changes
  • medicines
  • surgery.

Read our information on treatment for an enlarged prostate.


Updated: August 2015 | Due for Review: August 2017

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