A fever isn't a broken thermostat — a pyrogen deliberately turns it up. Drag through one fever episode and watch the hypothalamic set point jump, the body chase it with chills, then fall and break in a sweat.
Temperature over time
One fever episodedrag the slider to begin
Drag to move through the fever episode · or tap a phase above
Set point37.0°
Body temp37.0°
ThermostatOn target
Key idea: in fever the thermostat is not broken — the set point itself is raised. The body then works to reach it (chills), and when the set point drops, works to leave it (sweats).