The prostate is a gland. It is usually the size and shape of a walnut and grows bigger as you get older. It sits underneath the bladder and surrounds the urethra, which is the tube that carries urine (wee) out of the body. The prostate's main job is to help make semen – the fluid that carries sperm.

The most common prostate problems are an enlarged prostate, prostatitis and prostate cancer. Prostate cancer can develop when cells in the prostate start to grow in an uncontrolled way.

Some prostate cancer grows too slowly to cause any problems or affect how long you live. Because of this, many men with prostate cancer will never need any treatment.

But some prostate cancer grows quickly and is more likely to spread. This is more likely to cause problems and needs treatment to stop it spreading.