Hypothermia occurs when a person's body loses heat faster than it can produce heat, and the core body temperature, which is usually 98.6 F (or 36 C) drops below 95 F (or 35 C).

Symptoms of hypothermia:
  • Shivering
  • Slurred speech
  • Drowsiness/lethargy
  • Clumsiness
  • Weak pulse
  • Slow, shallow breathing
  • Confusion
  • Unconsciousness 
Treatment for Hypothermia:
  • Be gentle. When you're helping a person with hypothermia, handle him or her gently. Excessive, vigorous or jarring movements may trigger cardiac arrest.
  • Move the person out of the cold. Move the person to a warm, dry location if possible. Ior at least shield the person from the cold and wind as much as possible. Keep them lying down if possible.
  • Remove wet clothing. 
  • Cover the person with blankets. Use layers of dry blankets or coats to warm the person. Cover the person's head, leaving only the face exposed.
  • Insulate the person's body from the cold ground. If you're outside, lay the person on his or her back on a blanket or other warm surface.
  • Monitor breathing.If the person's breathing has stopped or appears dangerously low or shallow, begin CPR.
  • Provide warm beverages. If the affected person is alert and able to swallow, provide a warm, sweet, nonalcoholic, non-caffeinated beverage.
  • Use warm, dry compresses. Apply a compress of warm water in a plastic bottle or a dryer-warmed towel but only to the neck, chest wall or groin. Don't apply a warm compress to the arms or legs. Heat applied to the arms and legs forces cold blood back toward the heart, lungs and brain, causing the core body temperature to drop, which can be fatal.
  • ​Don't apply direct heat. Don't use hot water, a heating pad or a heating lamp to warm the person. The extreme heat can cause irregular heartbeats so severe they can cause the heart to stop.
- www.MayoClinic.org