T66-T78: Other and unspecified effects of external causes

T69: Other effects of reduced temperature

The group of conditions classified under "Other effects of reduced temperature" generally refers to physical harm or maladies resulting from exposure to low temperature environments. These conditions can be experienced by both adults and children, where the body's ability to produce or retain heat is compromised. The typical symptoms of these conditions, like chills, shivering, lack of coordination, fatigue and confusion, vary depending on the severity of the exposure. If left untreated, ongoing exposure to cold conditions can progress to more severe symptoms including hypothermia and frostbite. Hypothermia affects the nervous system resulting in factors like slowed reactions and thought processes, while frostbite is known to damage skin and underlying tissues. These conditions primarily arise due to exposure to cold weather, immersion in cold waters, or staying in cold, unheated homes.