Consulting a doctor is recommended if the fever lasts for more than a couple of days, is accompanied by a rash, chest pains and breathing difficulties, or constant vomiting. If necessary, head straight to A&E if you can’t get in touch with your GP. Similarly, seek medical help if the person shows symptoms but does not have a temperature, as illness isn’t always accompanied by fever.
If you’re running a fever while pregnant, you should probably call a doctor or your midwife regardless of circumstances just to be on the safe side. Fevers can be especially dangerous during this period, both to the baby and the mother.