The exact cause of stomach cancer is still unclear, although you're more likely to develop it if you:
- are male
- are aged 55 or over
- have a diet low in fibre and high in processed food or red meat
- have a diet that contains a lot of salted and pickled foods
- have a stomach infection caused by Helicobacter pylori (H. pylori) bacteria
Read more about the causes of stomach cancer.
Types of stomach cancer
There are several different types of stomach cancer. More than 95% of stomach cancers develop in the cells of the stomach lining and are known as adenocarcinomas.
Less common types of stomach cancer include lymphoma of the stomach, which develops in the lymphatic tissue (tissue that drains away fluid and helps fight infection), and gastrointestinal stromal tumours (GISTs), which develop in the muscle or connective tissue of the stomach wall.
How stomach cancer is treated
If operable, surgery can cure stomach cancer as long as all of the cancerous tissue can be removed.
Surgery to remove some or all of the stomach is known as a gastrectomy. It will still be possible to eat normally after a gastrectomy, but you'll probably have to adjust the size of your portions.
Chemotherapy can also be used before surgery to help shrink the tumour and sometimes after surgery to help prevent the cancer returning.
Read more about treating stomach cancer.
Living with stomach cancer
Living with stomach cancer and the effects of surgery can be tough, but there are a range of services that can provide social, psychological and financial support.
Read more about living with stomach cancer.
The outlook for stomach cancer depends on several factors, including your age, your general health, and how far the cancer has spread (the stage of the condition).
Unfortunately, as stomach cancer isn't often picked up until the later stages, the outlook isn't as good as for some other cancers.
Cancer Research UK has detailed stomach cancer statistics.
In the UK, more than 4,000 people die from stomach cancer each year.
The stomach is a hollow sac of muscle that's connected to the oesophagus (gullet) at its top and the first section of the small intestine (duodenum) at its bottom.
The stomach's main purpose is to break down solid food into a semi-solid consistency using stomach acid. This makes it easier for the rest of the digestive system to absorb nutrients from the food.