Under most conditions your body maintains a healthy temperature. However, when exposed to cold temperatures or a cool, damp environment for prolonged periods, your body's control mechanisms may fail to keep your body temperature normal. When more heat is lost than your body can generate, hypothermia can result.
Wet or damp clothing can increase your chances of hypothermia, as can falling into cold water. An uncovered head and inadequate clothing during winter are other possible causes.
The key sign of hypothermia is an internal body temperature that drops to less than 95 F. Signs and symptoms include:
- Shivering
- Slurred speech
- Abnormally slow breathing
- Cold, pale skin
- Loss of coordination
- Fatigue, lethargy or apathy
Symptoms usually develop slowly. Someone with hypothermia typically experiences gradual loss of mental acuity and physical ability and so may be unaware of the need for emergency medical treatment.
Older adults, infants and young children, and people who are very lean are at particular risk. Other people at higher risk for hypothermia than the general public include those whose judgment may be impaired by mental illness or Alzheimer's disease and people who are intoxicated, homeless or caught in cold weather because their vehicles have broken down. Other conditions that may predispose people to hypothermia are malnutrition, cardiovascular disease and an underactive thyroid.
To care for someone with hypothermia:
- Move the person out of the cold. If going indoors isn't possible, protect the person from the wind, cover his or her head and insulate his or her body from the cold ground.
- Remove wet clothing. Replace wet things with a warm, dry covering.
- Dial 911 or call for emergency medical assistance. While waiting for help to arrive, monitor the person's breathing. If breathing stops or seems dangerously slow or shallow, begin cardiopulmonary resuscitation (CPR) immediately.
- Don't apply direct heat. Don't use hot water, a heating pad or a heating lamp to warm the victim. Instead, apply warm compresses to the neck, chest wall and groin. Don't attempt to warm the arms and legs. Heat applied to the arms and legs forces cold blood back toward the heart, lungs and brain causing the core body temperature to actually drop. This can be fatal.
- Don't give the person alcohol. Offer warm nonalcoholic drinks unless he or she is vomiting.
- Don't massage or rub the person. Handle people with hypothermia gently because they're at risk of cardiac arrest.
