What are the signs of heat stress or stroke?

The time to be most alert to the potential of heat stress among outside workers is in the springtime when temperatures can suddenly jump 20 or 30 degrees from day to day. The human body needs several days to adjust to temperature changes, so abrupt changes can put people at significant risk of heat problems.  Heat stroke has a spiraling effect. Once it affects the central nervous system, it gets worse and worse, and trying to cool off in the shade really won’t help. Get the worker emergency medical attention ASAP.