What is frostbite?

Frostbite is defined as the freezing of body tissue, which primarily affects the skin and underlying tissues. This condition occurs when the skin and other tissues freeze due to exposure to extremely cold temperatures. Frostbite typically affects the extremities, such as fingers, toes, ears, and the nose, where blood flow is limited. As the tissue freezes, ice crystals can form within the cells, leading to damage and cell death if not treated promptly. Recognizing frostbite is crucial, as severe cases can result in permanent injury or amputation.

In considering other options, the first describes heat exposure causing body tissue damage, which relates to heat-related illnesses rather than the freezing process. Dehydration in cold temperatures, while a concern during cold weather, does not encompass the actual physiological damage inflicted by frostbite. Lastly, swelling of body parts from overexertion pertains to strains or sprains rather than the effects of extreme cold on body tissue. This emphasizes the distinct nature of frostbite as a cold-induced injury.