Skin Temperature — The Biomarker That Sees Illness Before You Do
A 0.5C rise above your personal baseline can mean illness is coming — 24 hours before you feel it.
Track This Biomarker Free → ← All BiomarkersWhat Is Skin Temperature?
Skin temperature (not core body temperature) is measured continuously by Oura Ring, Fitbit Sense, WHOOP 4.0, and Apple Watch. Your personal nightly skin temperature variation is remarkably stable — typically within 0.2C of your baseline. Deviations above 0.5C indicate physiological stress: incoming illness, menstrual cycle phase changes, alcohol metabolism, or significant psychological stress.
Why It Changes
- Illness onset — fever response raises peripheral temperature
- Ovulation — luteal phase raises skin temperature 0.3–0.5C above follicular
- Alcohol — vasodilation raises skin temperature acutely
- Overtraining — systemic inflammation raises baseline
- Environmental heat exposure
- Certain medications including stimulants
How Hunuu Health Uses This Signal
Skin temperature deviation is one of the primary IHDS trigger inputs in the Hunuu model. Combined with HRV decline and SpO2 changes, temperature variation increases implicit signal confidence significantly. Hunuu uses a 7-day rolling baseline for accurate personal deviation detection.
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