Leg cramps due to heat: what to know

Heat cramps are painful, involuntary tightenings that often affect calves, thighs, or other heavily used muscles during or after activity. Sweat removes water and salts; exertion also tires the muscle. Muscle Aches can linger after the spasm, while Muscle Cramps describes the tightening itself.

Heat cramps can occur with dehydration and may be an early warning that the body needs cooling and rest. They should not be confused with heat illness involving confusion, collapse, or a change in alertness.

Stop exercising and move into shade or an air-conditioned place. Loosen extra clothing, cool the skin with wet cloths, and gently stretch the affected muscle. Sip water or an appropriate rehydration drink; Oral Rehydration Therapy may be discussed with a pharmacist or clinician when fluid and salt losses are substantial.

Do not return to strenuous activity while cramps, dizziness, nausea, or weakness continue. Rest and arrange a safer, cooler plan before resuming exercise.

Call emergency services for confusion, seizure, fainting, severe breathlessness, inability to drink, or a very high body temperature. Seek medical advice if cramps do not settle after cooling and fluids, recur during heat exposure, or are accompanied by worsening weakness, vomiting, or reduced urination.

Ask how to plan fluids and breaks for your usual activity, whether a rehydration product is appropriate, and whether medicines or medical conditions change your heat risk. Mention the setting, duration of exertion, sweating, and all symptoms that followed.