Heatstroke

This information is sourced from the Sandstorm book.

Treating Heatstroke

Nonlethal damage from heatstroke (including the accompanying fatigue) cannot be recovered until a character gets cooled off 0 by reaching shade, surviving until nightfall, getting doused in water, being targeted by endure elements, or the equivalent. Once the character is cooled or reaches a cooler environment (a temperature of 90 degrees or lower), the character responds normally to healing that removes nonlethal damage. When the character recovers the nonlethal damage taken from heatstroke, the fatigue penalties also end.