Drink fluids to replace those lost through sweat, and rest in a cool place until nausea passes. Muscle cramps Muscle cramps often signal excessive loss of fluids, calcium, sodium, and electrolytes due to profuse sweating. Massage cramped muscles and cool them with cold water. Drinking a beverage containing a small amount sodium, such as a properly-formulated sports beverage, may help relive and prevent cramps. Headaches When the body reduces blood flow to conserve fluids, it also limits the amount of fluids and oxygen sent to the brain.
Headaches often precede more serious forms of heat illness.
Drink fluids to replace those lost through sweat, and rest in a cool place until the headache passes. Lying down is often helpful in relieving headaches. The body attempts to conserve the fluids it has left by decreasing blood flow to the skin and lowering blood pressure. The lack of blood flow to the skin makes it cold, pale, and clammy. The body tem- perature will drop below normal.