Salivary gland cancer is a very rare cancer. About 720 people are diagnosed with salivary gland cancer in the UK every year. It is slightly more common in men than women. The number of people getting salivary cancer has remained stable in recent years.
We don’t know what causes salivary gland cancer but several factors can increase your risk.
What is a risk factor?
Anything that increases your risk of getting a disease is a risk factor. Different cancers have different risk factors.
Even if you have more than one risk factor it doesn’t mean you will definitely get a disease.
Just because researchers investigate something, that doesn't mean it will turn out to be a risk factor.
Your risk of getting salivary gland cancer increases as you get older. Most people who develop it are in their 50s or 60s. Remember, the risk is still small because this is a rare cancer.
For most cancers, the biggest risk factor is getting older.
Being exposed to radiation
You are at higher risk of developing salivary gland cancer if you have been exposed to radiation.
This may be because you had radiotherapy to your head or neck for another type of cancer. Or you may have previously come into contact with radioactive substances through your work.
There is some evidence of risk from radioiodine therapy, which is an effective type of internal radiotherapy treatment for thyroid cancer.
Having radiotherapy for a childhood cancer may increase the risk of salivary gland cancer for at least 20 years after treatment.
If you have had Hodgkin lymphoma in the past, you have an increased risk of cancer of the salivary glands.
Your risk of developing salivary cancer may be increased if someone else in your family has had it.
This may be due to lifestyle factors that are common within families and not necessarily anything to do with a genetic link. More research is needed to work out how strong the link might be.
Other possible causes
Stories about potential causes are often in the media and it isn’t always clear which ideas are supported by evidence. There might be things you have heard of that we haven’t included here. This is because either there is no evidence about them or it is less clear.