Hypothermia is the lowering of the body temperature to extreme levels and it can be very dangerous, even deadly. If a companion shows signs of hypothermia—confusion, lack of coordination and speech difficulties—the Mayo Clinic suggests you first gently get the person out of the cold. Remove his or her wet clothing and cover with blankets or thermal blankets. Additionally, keep the person’s body from touching the cold ground and provide warm beverages. Hyperthermia is just the opposite of hypothermia and is frequently called heat stroke. Symptoms can include dizziness, nausea, weakness, thirst, and a headache. To treat someone with hyperthermia, cool them off by applying ice packs or cold water to the neck, groin, and armpits. Also, sponge or spray them with water and fan their skin. Lastly, have them drink cold water if they are conscious to start cooling down from the inside.