Because most body heat is lost through the head, it is important to wear a hat. If it is extremely cold, cover your mouth to protect your lungs from the cold air. Watch for signs of hypothermia, which is particularly threatening to the very young and elderly. Hypothermia is an internal body temperature drop such that body processes slow to the point that they can no longer generate as much heat as is being lost. Hypothermia can be fatal.
Symptoms are confusion, slurred speech, stiff muscles, or uncontrollable shivering.
If symptoms occur, get medical assistance immediately. This document is published by authority of the Minister of the Environment. Copyright Minister of Supply and Services Canada 1995.