Heat illness occurs when the body’s temperature control system cannot maintain an acceptable temperature. Under normal circumstances, the body cools itself by sweating. When high temperatures and high humidity prevent the body from releasing heat efficiently, however, a person’s body temperature can rise quickly, which causes numerous medical symptoms. If left untreated, very high body temperatures might damage the brain and other vital organs and ultimately cause a person’s death. You must train all employees who may be exposed to heat stress, as well as their supervisors, to recognize the four stages of heat illness.

  • Progression to serious illness can be rapid. Take all signs or symptoms seriously.

Heat Rash or Prickly Heat

Excessive sweating during hot, humid weather can cause heat rash, which appears as a red cluster of pimples or small blisters most likely on the neck and upper chest, in the groin area, under the breasts and in elbow creases. The rash occurs when the body is exposed to hot and humid conditions, which substantially reduce the person’s ability to sweat and decreases the employee’s heat tolerance.

To treat heat rash, wash the affected area with soap and water and dry it thoroughly. Apply calamine lotion or powder to relieve discomfort. Avoid using creams or ointment; they keep the skin warm and moist and can aggravate the condition.

Heat Cramps

Cramps usually occur when an employee performs hard physical labor in a hot environment. Heat cramps usually affect arm and leg muscles, but can also affect stomach and back muscles. Painful cramps occur intermittently after prolonged exposure to hot conditions. Typically, an electrolyte imbalance brought on by sweating causes heat cramps. Studies show that drinking commercially available carbohydrate-electrolyte replacement fluids, such as sports drinks, minimizes adverse effects during recovery.

To treat heat cramps:

  • Interrupt all activity and move the employee to a cool environment.
  • Increase intake of water, juice or a sports drink.
  • Continue rest for several hours after the cramps subside.
  • Seek medical attention if the cramps do not subside within one hour. This can be a symptom of heat exhaustion.

Heat Exhaustion

Heat exhaustion develops from exposure to high temperatures with inadequate or unbalanced fluid replacement. An employee usually displays the following warning signs of heat exhaustion:

  • Heavy sweating with cool, moist skin.
  • Fast, but weak pulse rate.
  • Shallow, fast breathing.
  • Paleness.
  • Muscle cramps.
  • Weakness or tiredness.
  • Dizziness.
  • Headache.
  • Nausea or vomiting.
  • Fainting.

To treat heat exhaustion:

  • Drink cool, nonalcoholic, decaffeinated beverages.
  • Rest in an air-conditioned or cooled environment.
  • Take a cool, but not cold, shower or sponge bath.

Fortunately, heat exhaustion responds readily to prompt treatment. Heat exhaustion should not be dismissed lightly, as the associated fainting can be dangerous. The victim could be operating machinery, controlling an operation that should not be left unattended or may be injured when they faint. Heat exhaustion’s signs and symptoms are similar to those of heat stroke, which is a medical emergency.

Heat Stroke

Heat stroke occurs when the body becomes unable to control its temperature. The employee’s body temperature could rise quite rapidly, reaching 106 F or higher within as little as 10 to 15 minutes. Heat stroke is a serious condition requiring urgent medical attention. If emergency treatment is not provided quickly, heat stroke can cause death or permanent disability. Warning signs of heat stroke include:

  • High body temperature over 102 F.
  • Red, hot and dry skin with no sweating.
  • Rapid, strong pulse.
  • Throbbing headache.
  • Dizziness.
  • Nausea.
  • Confusion.
  • Convulsions.
  • Decreased or loss of consciousness.

If you see any warning signs of heat stroke, call 911 for medical assistance while simultaneously taking the following step immediately:

  • Move the victim to a shady area.
  • Help cool the victim’s body; put ice packs in groin and underarms or soak clothing with cool water. Do not use cold water.
  • If the humidity is low, wrap the victim in a cool wet sheet and place them in front of a fan to aid evaporation.
  • Provide the victim with cool water; avoid caffeinated and alcoholic beverages.
  • Obtain medical assistance as soon as possible. If medical assistance will be delayed, contact a hospital emergency room for assistance.