Heat cramps usually affect people who sweat a lot during strenuous
activity. This sweating depletes the body's salt and moisture. The low
salt level in the muscles may be the cause of heat cramps. Heat cramps
may also be a symptom of heat exhaustion.
Recognizing Heat Cramps
Heat cramps are muscle pains or spasms-usually in the abdomen, arms, or
legs-that may occur in association with strenuous activity. If you have
heart problems or are on a low-sodium diet, get medical attention for
heat cramps.