Heat exhaustion is a condition whose symptoms may include heavy sweating and a rapid pulse, a result of your body overheating. It's one of ...COVID-19:Advice,updatesandvaccineoptionsWeareopenforsafein-personcare.Learnmore:MayoClinicfactsaboutcoronavirusdisease2019(COVID-19)OurCOVID-19patientandvisitorguidelines,plustrustedhealthinformationLateston COVID-19vaccination bysite:ArizonapatientvaccinationupdatesArizona,FloridapatientvaccinationupdatesFlorida,RochesterpatientvaccinationupdatesRochesterandMayoClinicHealthSystempatientvaccinationupdatesMCHSSkiptositenavigationSkiptoContentThiscontentdoesnothaveanEnglishversion.ThiscontentdoesnothaveanArabicversion.SectionsforHeatexhaustionSymptoms&causesDiagnosis&treatmentPrintOverviewHeatexhaustionisaconditionwhosesymptomsmayincludeheavysweatingandarapidpulse,aresultofyourbodyoverheating.It'soneofthreeheat-relatedsyndromes,withheatcrampsbeingthemildestandheatstrokebeingthemostsevere.Causesofheatexhaustionincludeexposuretohightemperatures,particularlywhencombinedwithhighhumidity,andstrenuousphysicalactivity.Withoutprompttreatment,heatexhaustioncanleadtoheatstroke,alife-threateningcondition.Fortunately,heatexhaustionispreventable.Products&ServicesBook:MayoClinicBookofHomeRemediesBook:MayoClinicFamilyHealthBook,5thEditionNewsletter:MayoClinicHealthLetter—DigitalEditionShowmoreproductsfromMayoClinicSymptomsSignsandsymptomsofheatexhaustionmaydevelopsuddenlyorovertime,especiallywithprolongedperiodsofexercise.Possibleheatexhaustionsignsandsymptomsinclude:Cool,moistskinwithgoosebumpswhenintheheatHeavysweatingFaintnessDizzinessFatigueWeak,rapidpulseLowbloodpressureuponstandingMusclecrampsNauseaHeadacheWhentoseeadoctorIfyouthinkyou'reexperiencingheatexhaustion:StopallactivityandrestMovetoacoolerplaceDrinkcoolwaterorsportsdrinksContactyourdoctorifyoursignsorsymptomsworsenoriftheydon'timprovewithinonehour.Ifyouarewithsomeoneshowingsignsofheatexhaustion,seekimmediatemedicalattentionifheorshebecomesconfusedoragitated,losesconsciousness,o