Heatstroke, First Aid 

A person with heatstroke may have:

• A high body temperature (above 102° F)
• Skin that is red and hot with lack of sweating (sweating that has stopped)
• Small pupils
• A rapid, weak pulse
• Rapid, shallow breathing
• Extreme confusion or irritability
• Weakness
• Seizures
• Unconsciousness

You can differentiate the most severe form of heat illness, heatstroke, from less-severe forms by comparing the person's symptoms to those above. Less-severe forms of heat illness can be identified as follows:

• Heat cramps – Painful muscle cramps (eg, in the legs, arms, abdomen, or back), heavy perspiration, and general weakness/lightheadedness.
• Heat exhaustion – Feelings of nausea, light-headedness, or thirst, and the person may act irrationally, have dilated pupils (pupils are larger than normal), be very sweaty, or have cool and moist skin that is either reddened or pale.