On this page: The oesophagus and stomach | What are stomach and oesophageal cancers? | What are the risk factors? | How common are these cancers? | What are the symptoms of stomach and oesophageal cancers?
The oesophagus and stomach are part of the upper gastrointestinal (GI) tract and the digestive system.
The oesophagus is a long tube that delivers food, fluids and saliva from the mouth and throat to the stomach.
The stomach is a hollow, muscular organ in the upper left part of the abdomen, located between the end of the oesophagus and the beginning of the small bowel (small intestine). The stomach stores food that has been swallowed and assists with the absorption of some vitamins and minerals. The stomach also acts to pass the food and water into the rest of the digestive system, including the small and large bowel, where most of the processing of food takes place.
The different layers of tissue (known as the wall) in the oesophagus and stomach are:
In the stomach, acidic (gastric) juices are released from glands in the stomach mucosa. These juices break food down into a thick fluid, which then moves into the small bowel. When the broken-down food is in the small bowel, nutrients from the food are absorbed into the bloodstream. The waste matter moves into the large bowel (large intestine), where fluids are reabsorbed back into the body and the rest is passed out of the body as a bowel movement.
Oesophageal and stomach cancers are malignant tumours found in the tissues of the oesophagus or stomach. Both cancers start in the mucosa. As they grow deeper into the oesophageal or stomach wall the risk that they might spread to other parts of the body increases.
This cancer can be found anywhere in the oesophagus. In western countries such as Australia this cancer is most commonly found in the lower section of the oesophagus and where the oesophagus meets the stomach (gastro-oesophageal junction).
Oesophageal cancer can occur in different types of cells that exist in the oesophagus. The main types of cancer are:
Most stomach cancers start in the lining (mucosa) in the upper part of the stomach. This type of cancer is called adenocarcinoma of the stomach. Stomach cancer is also known as gastric cancer.
If it is not found and treated early, stomach cancer can grow through the stomach wall into nearby organs such as the pancreas and bowel. Stomach cancer can also spread into the lymphatic system to nearby lymph nodes or through the bloodstream to other parts of the body, such as the lungs. It may also spread to the lining of the abdominal cavity (peritoneum), which can cause swelling in the abdomen.
There are other less common types of cancer that can affect the oesophagus and stomach, including sarcomas, lymphomas, gastrointestinal stromal tumours (GIST), carcinoid tumours and small cell carcinomas.These types of cancer aren’t discussed here and treatment may differ. Call Cancer Council 13 11 20 for information about these rarer types of cancer, or speak to someone in your medical team.
The exact causes of oesophageal and stomach cancers are unknown, but the following factors may increase your risk. Having one or more of these risk factors does not mean you will develop oesophageal or stomach cancer. See your doctor if you are concerned about your risk factors or any symptoms you are experiencing.
Common risk factors include smoking, high alcohol consumption, and a diet low in fresh fruit and vegetables.
Gastro-oesophageal reflux disease (GORD) and Barrett’s oesophagus are risk factors for oesophageal cancer.
People who have repeated episodes of reflux (heartburn) may be diagnosed with GORD. This is when stomach acid backs up into the oesophagus.
Over time, the walls of the oesophagus become damaged, causing inflammation or loss of tissue (oesophagitis).
In some people this may cause the cells lining the oesophagus to be replaced by a different type of cell. This is called Barrett’s oesophagus.
Over 1300 people are diagnosed with oesophageal cancer in Australia each year. This is an uncommon cancer, making up 1.4% of cancer cases in men and 0.8% of cancer cases in women. However the incidence of adenocarcinoma of the oesophagus in Australia is increasing.
Each year, around 2000 people in Australia are diagnosed with stomach cancer.2 Stomach cancer makes up 2% of cancer cases in men and 1.4% of cancer cases in women.
Both cancers are more common in men – 65% of people diagnosed with oesophegeal cancer and 70% of people diagnosed with stomach cancer are male.
Around 80% of oesophageal and stomach cancers are diagnosed in people aged 60 years and older. The average age that people are diagnosed with cancers of the oesophagus and stomach is around 71.
In their early stages, oesophageal and stomach cancers may not cause symptoms. These cancers are usually slow-growing and may grow for many years before any symptoms are noticed. This means that they are not usually diagnosed until the cancer is more advanced.
Symptoms of oesophageal and stomach cancers are listed in the box below. These symptoms are common to many other conditions and do not necessarily mean that you have cancer.
However, if you experience any of these symptoms and they are ongoing, make an appointment with your general practitioner (GP).
"A routine check-up with my GP, involving various blood tests, led to gastro-intestinal testing that unearthed early stage oesophageal cancer." – Julie
Oesophageal cancer symptoms
Stomach cancer symptoms
Reviewed by: Prof Mark Smithers, Director, Upper GI/Soft Tissue Unit, Princess Alexandra Hospital, Professor, Discipline of Surgery, The University of Queensland; Katie Benton, Dietitian and Nutritionist, Upper Gastrointestinal Unit, Department of Nutrition and Dietetics, Princess Alexandra Hospital, QLD; Jeff Bull, Upper GI Cancer Clinical Practice Consultant, Cancer Services, Flinders Medical Centre, SA; Prof Bryan Burmeister, Senior Radiation Oncologist, Princess Alexandra Hospital, Dept Chair MSAC, Cancer Council Queensland; Frank Hughes, 13 11 20 Nurse, Cancer Council Queensland; June Leijon, Consumer; Dr Julia Maclean, Clinical Specialist, Speech Pathology, Cancer Care Centre, St George Hospital, NSW; A/Prof Euan Walpole, Medical Director, Cancer Services, Princess Alexandra Hospital & Southern Area Health Service, QLD.