Heat-related Illnesses and First Aid
Illustration of a man’s head who seems to have a high body temperature
Heat stroke, the most serious form of heat-related illness, happens when the body becomes unable to regulate its core temperature. Sweating stops and the body can no longer rid itself of excess heat. Signs include confusion, loss of consciousness, and seizures. “Heat stroke is a medical emergency that may result in death! Call 911 immediately.
Illustration of a man’s head who sweating
Heat exhaustion is the body’s response to loss of water and salt from heavy sweating. Signs include headache, nausea, dizziness, weakness, irritability, thirst, and heavy sweating.
Illustration of a leg which denotes cramping
Heat cramps are caused by the loss of body salts and fluid during sweating. Low salt levels in muscles cause painful cramps. Tired muscles—those used for performing the work—are usually the ones most affected by cramps. Cramps may occur during or after working hours.
Heat rash, also known as prickly heat, is skin irritation caused by sweat that does not evaporate from the skin. Heat rash is the most common problem in hot work environments.
The chart below shows symptoms and first aid measures to take if a worker shows signs of a heat-related illness.