Summer means hot, humid weather.
These problems stem from the body not being able to keep itself at its proper operating temperature due to excessive external temperatures. The potential for problems is present when the environmental temperature is close to or exceeds normal body temperature, making it difficult for excess heat to escape the body. In an effort to keep the body at a normal temperature, the blood vessels expand to carry more blood to the upper layers of skin and away from active muscles, the brain and other vital organs. This effort results in fatigue and a decline in alertness. The problem is compounded when high humidity is added to the situation.