Heat cramps in outdoor workers

Cramps may affect the muscles carrying out repeated lifting, climbing, walking or gripping. Heat makes the body sweat to cool itself; prolonged sweating can remove water and salts, while exertion increases muscle demand. A sudden tightening during a shift is a reason to pause and cool down, not a symptom to work through. Cramps may occur with thirst, fatigue or headache. Repeated episodes deserve assessment because [Muscle Cramps](/symptoms/muscle-cramps/) can have causes beyond workplace heat.

Stop the task, tell a supervisor and move into shade or a cooled area. Loosen protective clothing where safe, gently stretch the affected muscle and sip suitable fluids if alert and able to swallow. Plan regular cooling breaks, rotate heavy tasks, use breathable clothing where protective requirements allow, and keep drinking regularly rather than waiting for intense thirst. A clinician can explain whether [Oral Rehydration Therapy](/treatments/acute-and-urgent-care/oral-rehydration-therapy/) fits your circumstances. Do not restart demanding work while symptoms continue.

Get emergency help for confusion, collapse, seizure, severe breathing trouble, inability to drink or a very hot body. Arrange prompt medical assessment if cramps persist after cooling, recur during shifts, or come with vomiting, severe weakness or markedly reduced urine. These signs can indicate a more serious heat problem and require escalation.

Ask whether your medicines or medical conditions affect heat tolerance, fluid needs or sweating. Bring details about the task, protective equipment, weather, breaks, drinks and the muscles affected. Discuss a return-to-work plan after an episode.