Fever in adults - red flag symptoms Pyrexia in adults has a wide range of differential diagnoses. Dr Pipin Singh provides tips on how to identify potentially serious causes, including COVID-19, sepsis or malignancy, and when to refer. by Dr Pipin Singh Sign in to continue Sign In Email address Password Stay signed in Trouble signing in? Reset password: Click here Need help? Email us Register FREE Limited free articles a month Free email bulletins Register Now Register Now Take a 30-day trial Join MIMS now and pay nothing for the first 30 days Join GPOnline now and pay nothing for the first 30 days Sign Up Sign Up