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 two days. Symptoms come on very quickly and include feeling sick (nausea), diarrhoea and being sick (vomiting). You could also experience a high temperature, headache and aching arms and legs. Because Norovirus is so contagious it is really important that you stay away from hospitals and care homes and don't go to school or work until yo