Does heat exhaustion cause heat intolerance?

Heat exhaustion can follow prolonged heat, exertion or sweating. During it, the body may cool itself less effectively, making warm surroundings feel unusually difficult. You may feel weak, dizzy, sweaty, thirsty or nauseated, and symptoms may return if you go back into heat too soon. Heat intolerance can also have other explanations, including medicines or medical conditions, so it is not specific to heat exhaustion.

Rest in a cool environment and avoid strenuous activity until symptoms have settled. Wear loose, light clothing, use air movement or cool damp cloths, and drink small amounts regularly if you are alert and able to swallow. Plan breaks in shade or air conditioning when you must be outdoors. Never ignore renewed dizziness, weakness or nausea while exercising in heat.

Seek urgent help for confusion, fainting, seizures, inability to drink, repeated vomiting or very hot skin. Medical assessment is also appropriate when heat intolerance persists, repeatedly interferes with daily activities, or occurs without an obvious heat exposure. Do not leave a person with worsening heat symptoms alone.

Ask how long you should limit heat exposure, whether a medicine or health condition affects temperature control, and how to plan safe activity in warm weather.