Cramping of the arms, legs, and abdomen can happen during or after exercise or physical work, such as when hiking, running, or lifting heavy objects. Heat exhaustion is caused by not drinking enough water or other fluids. The signs to look for are weakness, faintness, dizziness, sweaty skin, headaches, nausea, and possible loss of appetite. Heat exhaustion, left untreated, can lead to heat stroke. Heat stroke symptoms include headaches, nausea, high body temperature, and a possible loss of consciousness.
Emergency treatment is required for heat stroke.
Simple prevention strategies can be used to counteract the effects of heat. When doing prolonged heavy work or exercise, drink at least one cup of fluid every 15-20 minutes. Sunscreen may be used on children six months or older. Wear light-colored, longer clothing and a wide brim hat to reflect the sun. Some medications produce an allergic rash on body parts exposed to the sun.