At its most basic, you suffer a heatstroke when your body overheats. This may be a result of too much physical activity in the sun (or other hot environments) or simply being exposed to the heat for a long period of time. When exposed to hot outdoors weather, humid weather can exacerbate your risk of heatstroke, especially if you are exposed to this weather for multiple, consecutive days. While heatstroke caused by strenuous physical activity can occur to anyone, those who are not accustomed to hot weather are at greater risk. Regardless of the direct cause, other exacerbating factors include wearing too much clothing, drinking alcohol, or not properly hydrating your body.