冻伤是由于长期处于极为寒冷的状态下，而引起的人体局部或全身性的伤害。轻时可造成皮肤组织的红肿、局部血液流通不畅，并会产生发痒、刺痛、麻木等感觉，需要治疗；重时则会伴随失温，皮肤发黑、血管坏死，然后丧失知觉，造成全身永久性的损伤，可能危及性命，需及早进行治疗。

Frostbite or cold burn is the medical condition in which localized damage is caused to skin and other tissues due to freezing. Frostbite is most likely to happen in body parts farthest from the heart and those with large exposed areas. The initial stages of frostbite are sometimes called frostnip.