The blood vessels are constricting in order to prevent hypothermia, a dangerous condition that occurs when your body loses more heat than it produces, causing the body's core temperature to drop below 95 degrees Fahrenheit.
"The most worrisome health effect from cold exposure is hypothermia, which can cause damage to vital organs, including the heart, nervous system and kidneys. In extreme cases, death can occur. This often is a result of abnormal cardiac rhythms," said Dr. Jeahan Colletti, an emergency medicine specialist at the Mayo Clinic in Rochester, Minnesota.
Those most at risk for hypothermia -- and any cold-related health hazard -- tend to be older adults, Salamon said.
"If people have a neighbor who is an older person, when there's weather that's really cold, they should check up on them. When people get really, really cold, they can get very confused and not even know enough to call for help," she said.
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