Hot Tubs Engineered for the World’s Harshest Climates

Arctic Spas Manuals

A01 – Owners Manual

10. Hyperthermia



Prolonged immersion in hot water may induce hyperthermia.

Hyperthermia occurs when the internal temperature of the body reaches a level several degrees above the normal body temperature of 99ºF (37°C). The symptoms of hyperthermia include drowsiness, lethargy, and an increase in the internal temperature of the body. The effects of hyperthermia include:

  • Unawareness of impending hazard;
  • Failure to perceive heat;
  • Failure to recognize the need to exit hot tub;
  • Physical inability to exit hot tub;
  • Fetal damage in pregnant women; and
  • Unconsciousness and danger of drowning.


The use of alcohol or drugs can greatly increase the risk of fatal hyperthermia in hot tubs or spas.