Heat intolerance Intolerance to heat and fevers Heat intolerance UMLS:C0231274 The inability to maintain a comfortable body temperature in warm or hot weather. Heat intolerance tends to produce a feeling of being overheated and profuse diaphoresis (sweating). Many, but not all, cases of heat intolerance are related to thyrotoxicosis. SNOMEDCT_US:69215007 HP:0002046 Abnormality of temperature regulation