Norovirus (vomiting bug ) Norovirus, also called the "winter vomiting bug", is a stomach bug that causes vomiting and diarrhoea. It can be very unpleasant, but usually goes away in about 2 days. The main symptoms of norovirus are: feeling sick (nausea) diarrhoea being sick (vomiting) You may also have: a high temperature a headache aching arms and legs The symptoms start suddenly within 1 to 2 days of being infected. How to treat norovirus yourself You can usually treat yourself or your child at home. The most important thing is to rest and have lots of fluids to avoid dehydration. You will usually start to feel better in 2 to 3 days. How norovirus is spread Norovirus can spread very easily. You can catch norovirus from: close contact with someone with norovirus touching surfaces or objects that have the virus on them, then touching your mouth eating food that's been prepared or handled by someone with norovirus Washing your hands frequently with soap and water is the b