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Gastroenteritis is an infection of the stomach and large intestine.
The two most common causes of gastroenteritis in adults in England are the norovirus and food poisoning, according to the NHS.
Common symptoms include vomiting, diarrhoea and dehydration.
The Queen has cancelled a visit to Swansea as she is "experiencing symptoms of gastroenteritis", a Buckingham Palace spokesperson has said.
Queen Elizabeth II was due to make the trip tomorrow.
"She will be assessed in the coming days", the spokesperson said, adding "Her Majesty is currently spending the weekend at Windsor, as usual".
The Queen has cancelled a visit due to gastroenteritis, a royal spokesman has said.
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Before falling ill the Queen took part in a series of high profile public events. This gallery shows her work over the past week.