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Risk factors
By Mayo Clinic staffA number of factors can increase the risk of developing hypothermia:
- Older age. People age 65 and older are more vulnerable to hypothermia for a number of reasons. The body's ability to regulate temperature and to sense cold may lessen with age. Older people are also more likely to have a medical condition that affects temperature regulation. Some older adults may not be able to communicate when they are cold or may not be mobile enough to get to a warm location.
- Very young age. Children lose heat faster than adults do. Children have a larger head-to-body ratio than adults do, making them more prone to heat loss through the head. Children may also ignore the cold because they're having too much fun to think about it. And they may not have the judgment to dress properly in cold weather or to get out of the cold when they should. Infants may have a special problem with the cold because they have less efficient mechanisms for generating heat.
- Mental problems. People with a mental illness, dementia or another condition that interferes with judgment may not dress appropriately for the weather or understand the risk of cold weather. People with dementia may wander from home or get lost easily, making them more likely to be stranded outside in cold or wet weather.
- Alcohol and drug use. Alcohol may make your body feel warm inside, but it causes your blood vessels to dilate, or expand, resulting in more rapid heat loss from the surface of your skin. The use of alcohol or recreational drugs can affect your judgment about the need to get inside or wear warm clothes in cold weather conditions. If a person is intoxicated and passes out in cold weather, he or she is likely to develop hypothermia.
- Certain medical conditions. Some health disorders affect your body's ability to regulate body temperature. Examples include underactive thyroid (hypothyroidism), poor nutrition, stroke, severe arthritis, Parkinson's disease, trauma, spinal cord injuries, burns, disorders that affect sensation in your extremities (for example, nerve damage in the feet of people with diabetes), dehydration, and any condition that limits activity or restrains the normal flow of blood.
- Medications. A number of drugs, including certain antidepressants, antipsychotics and sedatives, can change the body's ability to regulate its temperature.
References
- Extreme cold: A prevention guide to promote your personal health and safety. Centers for Disease Control and Prevention. http://www.bt.cdc.gov/disasters/winter/pdf/cold_guide.pdf. Accessed April 11, 2011.
- Hypothermia: A cold weather hazard. National Institute on Aging. http://www.nia.nih.gov/NR/rdonlyres/6A2BEFB0-7D47-4978-9DF0-8638A6318685/15253/Hypothermia.pdf. Accessed April 1, 2011.
- Hypothermia. The Merck Manuals: The Merck Manual for Healthcare Professionals. http://www.merckmanuals.com/professional/print/sec21/ch319/ch319d.html. Accessed April 1, 2011.
- Mechem CC, et al. Accidental hypothermia in adults. http://www.uptodate.com/home/index.html. Accessed April 1, 2011.
- McCullough L, et al. Diagnosis and treatment of hypothermia. American Family Physician. 2004;70:2325.
- Jurkovich GJ. Environmental cold-induced injury. Surgical Clinics of North America. 2007;87:247.
- Frostbite and hypothermia. American Red Cross. http://www.redcross.org/www-files/Documents/Preparing/Frostbite_and_Hypothermia.pdf. Accessed April 1, 2011.
- Winter safety tips. American Academy of Pediatrics. http://www.aap.org/advocacy/releases/decwintertips.cfm. Accessed April 1, 2011.
- Angert D, et al. Preventing injuries and illnesses in the wilderness. Pediatric Clinic of North America 2010;57:683.
- Hypothermia and cold water. Canadian Red Cross. http://www.redcross.ca/print.asp?id=015204. Accessed April 1, 2011.
- Cold water survival tips. U.S. Army Core of Engineers and U.S. Coast Guard. http://www.army.mil/-news/2011/02/03/51309-cold-water-survival-tips-from-usace-and-uscg/. Accessed April 1, 2011.
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