Article in English: Dry gangrene may be the result of the following factors:   Diabetes — This condition impedes blood flow, especially in the lower extremities, and can lead to a non-healing wound.   Vascular problems — Vascular problems, such as peripheral arterial disease (PAD), can reduce blood supply in the body. PAD, for example, occurs when the arteries of the heart or body narrow mainly due to atherosclerosis, which hardens the arteries and blood vessels.   Vasculitis — Vasculitis refers to a number of autoimmune conditions that cause the blood vessels to become inflamed, such as Raynaud's phenomenon. In this autoimmune disease, the blood vessels chiefly to the fingers and feet temporarily spasm (called a vasospasm), which in turn causes vasoconstriction, or a narrowing of the blood vessels. Triggers for Raynaud's include exposure to the cold and emotional stress.   Tobacco addiction — It can cause blockage of arteries and thus impair blood flow.  External injuries — Burns, accidents, wounds and surgeries can damage certain cells in the body which later on slows down blood supply. If the wounds are not treated appropriately and a major blood vessel is damaged or compromised, the vessel can no longer supply adequate blood to the surrounding tissues. This leads to inadequate oxygen supply to the affected body part and, as a result, the tissues surrounding it dies.  Frostbite — Exposure of extremities to very cold temperatures may block usual blood flow. In temperatures of freezing weather frostbite can occur in as little as 15 minutes. Frostbite principally affects the fingers and toes. For prevention, you can wear appropriately lined gloves and shoes to provide warmth and protection from moisture.  Infection — An untreated bacterial infection may consequently take over the affected tissue, resulting in its death and leading to gangrene. This is more common in wet gangrene. Gangrene may be classified into different categories, including:   Dry gangrene — This type is characterized by dry and withered skin with a brown to...

Summary in Vietnamese:
Biết nguyên nhân gây hoại thư. Hiểu về các dạng hoại thư. Biết các triệu chứng của bệnh hoại thư khô. Tìm cấp cứu y tế.