How long does oral rehydration therapy take to work for heat cramps?

Heat cramps are painful muscle spasms that can follow sweating during exertion or hot conditions. Sweat removes water and salts, and replacing only water may not correct the imbalance. Recovery can take longer when sweating continues, the person is still in the heat, or another problem is causing the cramps. The muscle may remain tender after the spasm settles.

Stop activity and move to a cool place. Rest the affected muscle and use gentle stretching only if it does not increase pain. Sip correctly prepared oral rehydration solution gradually rather than gulping it. Loosen extra clothing and cool the skin. Do not return to strenuous exercise until symptoms have settled and you feel well hydrated. A clinician can advise on suitable fluids when you have heart, kidney, or blood-pressure conditions.

Seek urgent help if cramps occur with confusion, fainting, seizure, severe weakness, trouble breathing, chest discomfort, or inability to drink. Get medical assessment if cooling and gradual rehydration do not improve the cramps within a few hours, if they repeatedly return, or if symptoms progress to headache, nausea, or marked dizziness. These features can signal a more serious heat illness.

Ask whether your symptoms are consistent with heat cramps, which rehydration product is suitable, and how long to avoid exercise. Discuss prevention if you work or train in hot conditions or take medicines that affect fluid balance.