Enlarged prostate: What is the King's health problem?

Charities have welcomed the King going public and sharing details about his prostate problem, to encourage men with similar symptoms to ask their doctor for a check-up.

He has an enlarged prostate - something many men develop as they age.

Buckingham Palace has confirmed it is definitely not cancer.

An enlarged prostate is not usually a serious threat to health but can cause troubling symptoms needing treatment.

The prostate is a gland that should be about the size of a walnut.

It sits at the base of the bladder - the organ that stores urine.

When men urinate, the urine flows into a long tube called the urethra, which passes through the centre of the prostate.

An enlarged prostate hugs that pipe tighter and can start to restrict the flow.

All prostates grow as men age.

How quickly varies from person to person - and it will not always cause an issue.

But more than one in three men over the age of 50 will have some symptoms of prostate enlargement.

Ones to look out for include:

Doctors call the condition benign prostate enlargement.

Benign means a growth that is not cancer.

The risk of prostate cancer is no greater for men with an enlarged prostate.

But the chances of developing prostate cancer also increase with age - and the symptoms can be similar.

So those with prostate problems should ask their doctor for a check-up.

The doctor will ask about symptoms and probably offer a physical rectal exam.

They put a gloved finger up through the anus to feel the prostate from inside the body.

This can be uncomfortable, and might make the patient feel they want to urinate, but should not hurt.

Doctors know some people can feel embarrassed - but it is a common procedure and takes just a few minutes.

They may also test samples of:

Symptoms are unlikely to disappear untreated - but, according to the NHS, half of men diagnosed with an enlarged prostate manage them without drugs or surgery, by:

Herbal supplements such as saw palmetto are not currently recommended, although some men say they work for them.

These are available on the NHS:

Desmopressins slow night-time urine production and anti-cholinergic drugs can reduce urgency to urinate.

Most patients' symptoms are alleviated, according to the NHS, but there can be side effects.

There are several types of surgery or procedures to shrink the prostate or widen the urethra available on the NHS.

Transurethral resection of the prostate (TURP) is done with the patient asleep under general anaesthetic and involves inserting a a very thin wire into the urethra. The wire is then to shave off bits of the prostate. There is also a similar procedure that uses a laser instead.

After both of these procedures, a catheter is fitted for a day or two, to collect urine while the patient recovers.

Some NHS hospitals offer aquablation, which uses pressurised water instead of a laser.

Others offer a steam treatment that takes about 20 minutes, under local anaesthetic, with the patient awake.

All procedures carry some risks.