What can cause hyperthermia and hypothermia before death?

Hypothermia is caused when your body temperature is decreasing rapidly and your body temperature is in shock. Hyperthermia is when your body temperature is greatly above normal, like being sick with a temperature, but with greater temperatures. They both can cause death. Temperatures outside or in living conditions can cause these which can cause death.

Ihaven't done that yet, so no idea,but this is not the right place to ask