What is the cause of frostbite in winter?

Poor peripheral circulation. Frostbite is mostly due to poor peripheral circulation, coupled with cold, sudden drop in temperature and other weather, which directly leads to vascular peripheral circulation disorder. Long-term exposure to cold environment. Frostbite often grows on hands, feet, face and earlobes. These parts are exposed to cold environment for a long time and are more prone to frostbite.

Physical strength and blood circulation are one of the causes of frostbite. People with heart disease, vascular disease and poor peripheral blood circulation have poor adaptability, tolerance and resistance to cold and are prone to chilblain. Frostbite is a very common skin disease in winter. It is precisely because of the cold weather in winter that the exposed skin is stimulated by freezing. As time goes on, the subcutaneous arterioles spasm and contract. Produce blood stasis, local tissue hypoxia, tissue cell damage.

Frostbite is a local hyperemia and inflammatory skin disease caused by cold. When the temperature is lower than 10℃, subcutaneous arterioles contract when cold, venous blood flow is not smooth, local skin ischemia and hypoxia, abnormal metabolism, long-term paralysis and expansion of blood vessels, blood stasis in blood vessels and plasma infiltration into tissue spaces, forming local edema, leading to chilblain. At first, the local skin is red and purple with lumps, itching or stinging, which is more obvious when heated, and then blisters, erosion and even tissue necrosis may occur.

People who live and work in humid environment can obviously aggravate the influence and harm of cold on them, and it is easier to destroy the contraction and relaxation function of local blood vessels and promote the formation of chilblain. Therefore, frostbite is more likely to occur in a humid environment than in a dry environment. In addition, standing for a long time, lack of activity, narrow clothing, malnutrition and excessive fatigue are also prone to frostbite.