If the heat load is too great or if the physical condition of the body is poor then the system can be overloaded and heat illness may occur. The skin must he able to produce the necessary amount of sweat Too little sweat production can be caused by dehydration, lack of acclimatization, and certain medical conditions. The sweat must he able to evaporate If a worker wears inappropriate clothing or if there is too little air movement or too high humidity then sweat cannot evaporate freely and heat illness may occur. There are 5 different conditions that can arise from exposure to heat. Existing health problems may be aggravated by heat.
Skin is cool and sweaty.
The person is conscious and rational. Treatable by discarding clothing, resting and frequent drinking. A medical check-up and sometimes hospitalisation should follow immediately. People are irritable, confused or apathetic. Fits or loss of consciousness may occur.