The warning signs of heat exhaustion include the following: Heavy sweating; Paleness; Muscle cramps; Tiredness; Weakness; Dizziness; Headache; Nausea or vomiting; Fainting; The skin may be cool and moist. The pulse rate will be fast and weak, and breathing will be fast and shallow. If heat exhaustion is untreated, it may progress to heat stroke.
https://www.cdc.gov/disasters/extremeheat/faq.html