You searched for: “thermohyperalgesia
thermohyperalgesia (s) (noun) (no pl)
Excessive thermalgesia (pain caused by a slight degree of heat): Thermohyperalgesia is what Mrs. Thompson experienced when Dr. Black applied a moderate amount of heat to the diseased spot on her arm.

Thermohyperalgesia is a condition of agony induced by hot or cold stimuli at thresholds lower than normal.