Cancer is a condition where cells in a specific part of the body grow and reproduce uncontrollably. The cancerous cells can invade and destroy surrounding healthy tissue, including organs.
Cancer sometimes begins in one part of the body before spreading to other areas. This process is known as metastasis.
More than one in three people will develop some form of cancer during their lifetime. In the UK, the four most common types of cancer are:
There are more than 200 different types of cancer, and each is diagnosed and treated in a particular way. You can find links on this page to information about other types of cancer.
Changes to your body's normal processes or unusual, unexplained symptoms can sometimes be an early sign of cancer.
Symptoms that need to be checked by a doctor include:
But in many cases your symptoms won't be related to cancer and will be caused by other, non-cancerous health conditions.
Read more about the signs and symptoms of cancer.
Making some simple changes to your lifestyle can significantly reduce your risk of developing cancer.
Surgery is the first treatment to try for most types of cancer, as solid tumours can usually be surgically removed.
Two other commonly used treatment methods are:
Accurately diagnosing cancer can take weeks or months. As cancer often develops slowly over several years, waiting for a few weeks won't usually impact on the effectiveness of treatment.
You shouldn't have to wait more than two weeks to see a specialist if your GP suspects you have cancer and urgently refers you.
In cases where cancer has been confirmed, you shouldn't have to wait more than 31 days from the decision to treat to the start of treatment.