If you have heard about hives then you must have also heard about heat hives.

Patients suffering from physical hives have a physical trigger such as heat, cold, pressure, water or exercise. If heat is the trigger, you get heat rash hives.

Heat rash hives are usually caused by a sudden increase in the body temperature, that could come from hot showers, exercise, spicy foods, or being under too many covers in bed at night. Strong emotional feelings and stress may also cause hives to occur in some people. Click here for more on heat rash hives.