谣言：有传言称，喝酒可以防冻疮，因此冬天温度低的时候，可以喝点酒预防冻疮的发生。真相：针对这种说法，首先我们需要搞明白冻疮是怎么形成的。我国幅员辽阔，冻伤也分为很多种。所谓冻疮，属于非冻结性冻伤，长江流域比北方多见，是由于手或足长时间（一般在12小时以上）暴露在寒冷、潮湿条件所致。其原因，可能是低温潮湿的作用，使血管处于长时间收缩或痉挛状态，继而发生血管持续扩张，血液瘀滞，血细胞和体液外渗，局部渗血、淤血、水肿等。有的毛细血管甚至小动、静脉，受损后发生血栓，严重者可出现水疱和皮肤坏死。患了非冻结性冻伤以后，会出现寒冷和针刺样疼痛，皮肤苍白，可起水疱，去除水疱后见创面发红有渗液，并发感染后形成糜烂或溃疡。之所以易复发，可能与患病后局部皮肤抵抗力降低有关。针对冻疮形成的原理，要想科学预防，应遵循防寒防水原则。对于患过冻疮者，尤其是儿童，在寒冷季节要注意手、足、耳等的保暖，并可擦涂防冻疮霜剂。发生冻疮后，局部表皮未糜烂者可涂抹冻疮，有糜烂或溃疡者应用抗菌药和皮质甾的软膏。这样看来，喝酒防冻疮并没有什么科学依据。而且，喝酒会使人体血管扩张，进而加大人体热量损失，而且饮酒后人对温度的敏感性降低，甚至不注意防冻，进而产生严重后果。
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