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Cold temperatures and increased wind speed (wind chill) cause heat to leave the body more quickly, putting workers at risk of cold stress. Anyone working in freezing conditions may be at risk of cold stress, e.g., workers in freezers, outdoor agriculture and construction. Learn about the common types of cold stress and better protect yourself in harsh winter conditions. 

Common Types of Cold Stress

Hypothermia

• Normal body temperature (98.6°F) drops to 95°F or less.
• Mild Symptoms: alert but shivering.
• Moderate to Severe Symptoms: shivering stops; confusion; slurred speech; heart rate/breathing slow; loss of consciousness; death.
  

Frostbite

• Body tissues freeze, e.g., hands and feet. Can occur at temperatures above freezing, due to wind chill. May result in amputation.
• Symptoms: numbness, reddened skin develops gray/white patches, feels firm/hard, and may blister.
  

Trench Foot (also known as Immersion Foot)

• Non-freezing injury to the foot, caused by lengthy exposure to wet and cold environment. Can occur at air temperature as high as 60°F, if feet are constantly wet.
• Symptoms: redness, swelling, numbness and blisters.
  

To learn more about winter hazards and precautions, visit  https://go.usa.gov/xpS2f.