You usually start by seeing your GP. They ask you about your general health and symptoms and also examine you. Your GP then decides whether to refer you for tests or to a specialist.
If your tests show that you have cancer you then have more tests to find out the size of the cancer and whether it has spread. This is called staging.
See your GP if you notice a change that isn't normal for you or if you have any of the possible signs and symptoms of cancer.
Your GP should arrange for you to see a specialist if you have symptoms that could be due to anal cancer.
There is no national screening programme for anal cancer in the UK. Read more about this.
Your doctor will examine your back passage to find out what is causing your symptoms.
These tests find out the position of the cancer, how big it is and whether it has spread. This tells you the stage of your anal cancer.