What Happens When You Get a Fever

Fever is not the illness—it’s a defensive tactic.
Your brain raises body temperature to make microbes uncomfortable.
Many bacteria and viruses reproduce poorly in higher heat.
The hypothalamus acts like your body’s thermostat.
Shivering helps generate extra warmth to reach the new temperature setpoint.
Sweating begins once the immune system wins, cooling the body down.
Moderate fever speeds up immune reactions and healing.
Severe or prolonged fever can harm proteins and tissues.
Fever-reducing medicine lowers temperature but may slightly slow the battle.
In essence, fever is your body’s controlled “heat weapon.”