You usually start by seeing your GP if you have symptoms. They examine you and might refer you for tests or to a specialist.
You might have a number of tests to help diagnose stomach cancer or to see how the big the cancer is and whether it has spread (the stage). Knowing the stage helps your doctor decide what treatment you need.
You may also have some of these tests if you have symptoms that could be a sign your cancer has come back after treatment.
An endoscopy is a test to look inside your body. Your doctor might take samples of any abnormal areas (biopsies) during the endoscopy.
You might have an endoscopic ultrasound scan (EUS) if you have cancer of the stomach. This is to help find out the size of the cancer and whether it has spread.
You will have a CT scan of your stomach, chest and the area between your hips (pelvis) to find out where the cancer is and whether it has spread.
A PET-CT scan combines a CT scan and a PET scan into one. It can show where your oesophageal cancer is and whether it has spread.
Laparoscopy is a small operation to look inside your tummy (abdomen). Doctors use it to find out if stomach cancer has spread.