Recognize problems early
Headache, dizziness, nausea, weakness, unusual fatigue and heavy sweating can be warning signs of heat exhaustion. These symptoms are not specific to dehydration; illness, medications and other conditions may also contribute.
What to do when someone feels sick
Stop strenuous work, move to a cooler area, notify a supervisor or coworker and begin cooling. Seek prompt medical assessment for symptoms that do not quickly improve or are getting worse. Follow your workplace's emergency procedures.
When it is an emergency
Confusion, fainting or collapse, seizures or other changes in mental status during heat exposure can indicate heat stroke. Call emergency services immediately. Move the person to a cooler place and begin rapid cooling while help arrives. Do not give fluids to someone who is confused or cannot safely swallow.
Heat prevention is more than a drink
Water access, suitable rest breaks, cooling, training, acclimatization and adjusted workloads are all part of heat safety. A sports drink cannot replace these protections.
Sources and further reading
Read NIOSH heat-related illnesses, NIOSH prevention recommendations, and OSHA water, rest and shade guidance. This guide is educational and does not diagnose a condition.