What Does Heat Exhaustion Mean in Outdoor Workers?

Working in direct sun, high humidity, or poorly ventilated areas can make it harder for sweat to evaporate. Physical effort, protective clothing, and not drinking enough fluids can add to the strain. A person may look pale or clammy and feel unusually tired, irritable, or unable to continue safely. Muscle cramps can occur, and the pulse may feel fast. Heat exhaustion can worsen if the person remains in the hot environment.

The condition is different from heat stroke, which is a medical emergency involving a serious change in mental state or loss of consciousness. Heat exhaustion should be treated promptly so the worker can cool down and be observed for worsening symptoms.

Stop the task and move the worker to shade, an air-conditioned room, or another cooler place. Remove extra outer clothing and loosen tight protective equipment. Give small, frequent sips of cool water if the person is awake, alert, and able to swallow; an oral rehydration drink may also be suitable. Cool the skin with wet cloths, fanning, or a cool shower. Stay with the worker and avoid sending them back into the heat until they have recovered and a responsible supervisor has reassessed the situation.

Call emergency services immediately if the worker becomes confused, has a seizure, collapses, loses consciousness, cannot drink, or has very hot skin with a serious change in behaviour. These signs may indicate heat stroke. Do not give fluids to an unconscious or confused person, and do not leave them alone. Arrange medical assessment if symptoms are severe, do not improve after moving to a cool place and starting cooling, or return after recovery. A clinician can also review medicines or health conditions that may affect heat tolerance.

Ask which symptoms should prompt emergency help, how to replace fluids during your work shift, and whether any medicine or health condition makes heat illness more likely. You can also ask when it is safe to resume outdoor duties and whether your work plan needs more shaded breaks, cooling options, or a different schedule.