The most important things to remember are dehydration and frostbite. While traveling, your body loses a lot of water. Drink as often as you can to maintain your strength. If you don't have access to water, melt snow. Eating unmelted snow can lead to the lowering of the inner body core temperature, causing hypothermia.
Frostbite is common during the late fall and early winter seasons.
To prevent it, warm your feet often and change to dry socks periodically. Frostbite can cause gangrene, which could result in the loss of body parts or even death. This silent killer is caused by the loss of body heat, which , if it continues, lowers the body's inner core temperature to a point where all body functions could cease. The primary cause of heat loss. At 5 degrees F, the loss can be 75 percent under the same conditions.