Yes, feeling cold (chills) is a common symptom of having a fever (elevated body temperature).
Chills occur when your body is actively raising its temperature set-point during fever, making you feel cold even though your actual body temperature is rising or already elevated. This paradoxical sensation is a central nervous system phenomenon, not dependent on actual skin cooling 1.
How Chills Work During Fever
When pyrogens (fever-inducing substances) trigger fever, they act on the hypothalamus to reset your body's temperature "thermostat" to a higher level 2. During this adjustment:
- Your brain perceives your current body temperature as "too cold" relative to the new elevated set-point
- This triggers heat-generating mechanisms (shivering) and heat-conservation responses (vasoconstriction)
- You experience the sensation of feeling cold or having chills, even as your actual temperature climbs 1, 3
Research demonstrates that chills can occur without any reduction in skin temperature—the sensation arises from central nervous system action of pyrogens 1. This is the "chill phase" of fever, particularly prominent at fever onset 3.
Clinical Significance of Chills
The severity of chills correlates with infection severity, particularly bacteremia risk 4:
- Shaking chills (whole-body shaking even under blankets): 12-fold increased risk of bacteremia
- Moderate chills (needing thick blankets): 4-fold increased risk
- Mild chills (cold-feeling, needing jacket): 1.8-fold increased risk
- Shaking chills have 90% specificity for bacteremia 4
Key Distinction: Fever vs. Other Causes of Elevated Temperature
Fever is unique among conditions causing elevated body temperature because it represents a regulated, defended rise in the set-point 3. Other forms of hyperthermia (heat stroke, exercise-induced) do not produce chills because the thermoregulatory set-point remains normal—the body is trying to cool down, not warm up.
Common Pitfall to Avoid
Don't assume absence of measured fever means no infection if the patient reports recent chills. Antipyretic use within 4 hours can normalize temperature readings despite ongoing infection 5. Always ask about timing of fever-reducing medications and home temperature measurements.