Rigor (medicine)

Rigor is a shaking occurring during a high fever. It occurs because cytokines and prostaglandins are released as part of an immune response and increase the set point for body temperature in the hypothalamus.

Additional recommended knowledge

How to quickly check pipettes?

What is the Correct Way to Check Repeatability in Balances?

Don't let static charges disrupt your weighing accuracy

The increased set point causes the body temperature to rise (pyrexia), but also makes the patient feel cold until the new set point is reached. Rigor occurs because the patient is effectively shivering in a physiological attempt to increase body temperature to the new set point.

See also

• rigor mortis