An adult has a fever when their temperature exceeds 99–99.5°F (37.2–37.5°C). What usually causes a fever? Fever occurs when a part of the brain called the hypothalamus shifts the set point of your normal body temperature upward.What is the reason for having a fever?
Most fever is beneficial, causes no problems, and helps the body fight off infections. The main reason to treat a fever is to increase comfort. Fever is the result of an immune response by your body to a foreign invader. Foreign invaders include viruses, bacteria, fungi, drugs, or other toxins.When is fever dangerous in adults?
But, when an adult's temperature begins to spike at 103 degrees F and above, Banner Health reports, that there may be a cause for concern. A spiking fever can be dangerous and often requires medical intervention, especially if the high fever lasts for more than 72 hours.What temp is a dangerous fever?
High-grade fevers range from about 103 F-104 F. Dangerous temperatures are high-grade fevers that range from over 104 F-107 F or higher (extremely high fevers are also termed hyperpyrexia).