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Rigor (medicine)

Name of Symptom/Sign:
Classifications and external resources
ICD-10 R50.0
ICD-9 780.6

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.

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

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Rigor_(medicine)". A list of authors is available in Wikipedia.
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