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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 of 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 biopsy. You might have an endoscopy to help diagnose stomach cancer. 

Blood tests

You might have blood tests to help diagnose stomach cancer. 

Ultrasound from inside the body (EUS)

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. 

CT Scan

You might 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.

PET-CT scan

Find out what a PET-CT scan is, how you have it and what happens after it.


Laparoscopy is a small operation to look inside your tummy (abdomen). Doctors use it to find out if stomach cancer has spread.

Last reviewed: 
16 Aug 2019

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