Immersion foot results from prolonged exposure to cold and water. What is another name for this condition?

• A. Frostbite
• B. Frostnip
• C. Trench foot
• D. Hypothermia

Answer: (C)

Immersion foot, also known as trench foot, comes from prolonged exposure of the feet to cold, wet conditions. The persistent dampness plus cold hurts the skin and underlying tissues by causing moisture-induced skin maceration and reduced blood flow from ongoing vasoconstriction. Over time this can lead to swelling, numbness, blisters, and even tissue damage if not addressed. The term trench foot specifically reflects those damp, in-water conditions and is distinct from other cold injuries: frostbite is freezing of tissue, frostnip is a milder superficial freezing, and hypothermia is a systemic drop in core body temperature.