What Causes a Fever? – Why Do We Get Fever? Fever, also known as pyrexia and febrile response, is defined as having a temperature above the normal range due to an increase in the body’s temperature set-point. A fever can be caused by many medical conditions ranging from the not serious to potentially serious. This includes viral, bacterial and parasitic infections such as the common cold, urinary tract infections, meningitis, malaria and appendicitis among others. Non-infectious causes include vasculitis, deep vein thrombosis, side effects of medication, and cancer among others.[8] It differs from hyperthermia, in that hyperthermia is an increase in body temperature over the temperature set-point, due to either too much heat production or not enough heat loss. What Causes a Fever? – Why Do We Get Fever? Enjoy and stay connected with us!! Subscribe to My Health Channel for daily videos. https://www.youtube.com/channel/UCwOoPOwnExqVrkciOnyFtBg Like us on Facebook http://www.facebook.com/Tizzyworld1