<unk> , also referred to as pyrexia, is defined as having a temperature above the normal range due to an increase in the body's temperature set point. There is not a single agreed-upon upper limit<unk> or normal temperature with sources using values between in humans. The increase in set point triggers increased muscle contractions and causes a<unk> eeling of cold or chills. This results in greater heat production and efforts to conserve heat. When the set point temperature returns to normal, a person<unk> eels hot, becomes<unk> lushed, and may begin to sweat. Rarely a<unk>  may trigger a<unk> ebrile seizure, with this being more common in young children.<unk> s do not typically go higher than . A<unk>  can be caused by many medical conditions ranging<unk> rom non-serious to life-threatening. This includes viral, bacterial, and parasitic infections—such as influenza, the common cold, meningitis, urinary tract infections, appendicitis, COVID-19, and malaria. Non-infectious causes include vasculitis, deep vein thrombosis, connective tissue disease, side effects of medication or vaccination, and cancer. It differs<unk> rom 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. Treatment to reduce<unk>  is generally not required. Treatment of associated pain and inflammation, however, may be useful and help a person rest. Medications such as ibuprofen or paracetamol (acetaminophen) may help with this as well as lower temperature. Children younger than three months require medical attention, as might people with serious medical problems such as a compromised immune system or people with other symptoms. Hyperthermia does require treatment.<unk>  is one of the most common medical signs. It is part of about 30% of healthcare visits by children and occurs in up to 75% of adults who are seriously sick. While<unk>  evolved as a defense mechanism, treating<unk>  does not appear to worsen outcomes.<unk>  is often viewed with greater concern by parents and healthcare professionals than is usually deserved, a phenomenon known as<unk>  phobia.
Fever
Hyperthermia
Alertness
Cough
Sedation
Continuous fever
Rash
Nausea