Prostate cancer is the most common cancer in men in the UK, with over 40,000 new cases diagnosed every year.
Prostate cancer usually develops slowly, so there may be no signs you have prostate cancer for many years.
Symptoms often only become apparent when your prostate is large enough to affect the urethra (the tube that carries urine from the bladder to the penis).
When this happens, you may notice things like an increased need to urinate, straining while urinating and a feeling your bladder has not fully emptied.
However, these signs do not mean you have prostate cancer. It is more likely they are caused by something else, such as benign prostatic hyperplasia (also known as BPH or prostate enlargement).
Read more about the symptoms of prostate cancer.
Why does prostate cancer happen?
The causes of prostate cancer are largely unknown. However, a number of things can increase your risk of developing the condition.
The chances of developing prostate cancer increase as you get older. Most cases develop in men aged 50 or older.
For reasons not understood, prostate cancer is more common in men of African-Caribbean or African descent, and less common in men of Asian descent.
Men who have first degree male relatives (such as a father or brother) affected by prostate cancer are at slightly increased risk as well.
Read more about the causes of prostate cancer.
Tests for prostate cancer
There is no single test for prostate cancer. All the tests used to help diagnose the condition have benefits and risks, which your doctor should discuss with you.
The most commonly used tests for prostate cancer are blood tests, a physical examination of your prostate (known as a digital rectal examination or DRE) and a biopsy.
The blood test, known as a prostate-specific antigen (PSA) test, measures the level of PSA and may help detect early prostate cancer. Men are not routinely offered PSA tests to screen for prostate cancer as results can be unreliable.
This is because the PSA blood test is not specific to prostate cancer. PSA can be raised due to a large non-cancerous growth of the prostate (BPH), a urinary tract infection or inflammation of the prostate as well as prostate cancer. Raised PSA levels also cannot tell a doctor whether a man has life-threatening prostate cancer or not. This means that a raised PSA can lead to unnecessary tests and treatment.
However, you can ask to be tested for prostate cancer once the benefits and risks have been explained to you.
Read more about diagnosing prostate cancer and PSA screening for prostate cancer.
How is prostate cancer treated?
For many men with prostate cancer, treatment is not immediately necessary.
If the cancer is at an early stage and not causing symptoms, a policy of "watchful waiting" or "active surveillance" may be adopted. This involves carefully monitoring your condition.
Some cases of prostate cancer can be cured if treated in the early stages. Treatments include surgically removing the prostate, radiotherapy and hormone therapy.
Some cases are only diagnosed at a later stage when the cancer has spread. If the cancer spreads to other parts of the body, typically the bones, it cannot be cured and treatment is focused on prolonging life and relieving symptoms.
All treatment options carry the risk of significant side effects, including erectile dysfunction and urinary incontinence. For this reason, many men choose to delay treatment until there is a risk the cancer might spread.
Read more about treating prostate cancer.
Living with prostate cancer
As prostate cancer usually progresses very slowly, you can live for decades without symptoms or needing treatment.
Nevertheless, it can have an effect on your life. As well as causing physical problems such as erectile dysfunction and urinary incontinence, a diagnosis of prostate cancer can understandably make you feel anxious or depressed.
You may find it beneficial to talk about the condition with your family, friends, a family doctor and other men with prostate cancer.
Financial support is also available if prostate cancer reduces your ability to work.
Read more about living with prostate cancer.