You usually start by seeing your GP. They will ask you about your general health and symptoms and usually examine you. And you might have a blood test.
Your doctor then decides whether to refer you to a specialist.
Find out what happens when you see your GP and how to get the most out of your appointment.
It can be very difficult for GPs to decide who to refer to a specialist. The symptoms of cancer can be very similar to those of other medical conditions.
The tests you need depend on the symptoms you have and which part of your body is affected.
You are likely to have a lot of questions to ask your doctor. It might help to write them down so you don't forget.