俄罗斯地理特征:寒从足下起 火从头上生

　　脚位于人躯体的末端，离心脏较远，血液的供应较少，再加之脚的表面脂肪层又薄，保温能力较差，所以脚的皮温较低。人的正常体温一般在36.5℃左右，而趾尖温度有时只有25℃，当我们感到寒冷时，首先感受到的是脚冷、腿冷。因此，在寒冷的冬季，我们更应注意双腿和双脚的保暖，尤其是女性朋友，若不注意，容易诱发下肢静脉曲张和一些妇科病。

　　而头部血管丰富，而感受温度的神经很少，因此，对外界冷热变化不敏感，这也是为什么我们夜间睡觉时，即使再冷头却不怕冷的原因。另外，因为人的大脑时刻处于思考活动中，大脑的血液循环快，温度高，因此，当我们在认真思考问题的时候，往往会觉得“头脑发热”。当然，即使头部相对而言是最“不怕冷”的，但是在冬季，适当的保暖措施还是必不可少。

　　从中医角度看，这句话也是有道理的。在中医经络学中，六阳经均起始(或终结)于头面部，因此头有“诸阳之会”之称，而阳有主火热的一面，而火热之邪升腾上炎，其致病就多表现于人的头面部，朱丹溪说“头痛甚者火多”，叶天士说：“上先受之”。所以，人上火常先表现在头面部的器官上，如常见的口舌生疮、流鼻血、喉头肿胀……都是“上火”的表现。

　　此所谓“寒从足下起，火从头上生”。（田静）

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The first step up from the fire from the head was born　http://www.gmw.cnThe 2011-12-17 07:36:47 sources:Public health report　　[name:big in small]

In the end of the body feet who, far from the heart, blood supply less, plus the fat layer and the surface of the foot thin, heat preservation ability is bad, so the foot skin temperature is low.The normal temperature of people generally in 36.5 ℃ or so, and sometimes only tiptoe temperature 25 ℃, when we feel the cold, you feel is the cold feet, legs, and cold.Therefore, in cold winter, we should pay attention to the legs and feet to keep warm, especially female friends, if attention, and likely to cause the varix and some of the biggest.

And the head vascular rich, and feel the temperature of the neural rarely, therefore, is not sensitive to external heat, that is why we sleep at night, even if a head cold cold reason does not fear.In addition, because the brain moment in thinking activity, brain blood circulation is fast and the temperature is high, therefore, when we think about the problems in earnest, often can feel "mind fever".Of course, even if the head relatively is the most "not afraid cold", but in winter, the appropriate heat preservation measures or necessary.

From the perspective of traditional Chinese medicine, this sentence is reasonable.In Chinese medicine meridian science, six Yang meridians are starting (or end) to head the face, so the head has "ZhuYang will be" say, and Yang is the main hot side, and the evil on rising hot phlogistic, its pathogenesis is much the head of the performance in the face, gerda creek said "headache worse fire much", jiao tone say: "first by the".So, people often lose performance at the head of the first face on organs, such as common your breath born sores, flow nosebleed, laryngeal strut......Is "fire" performance.

This so-called "cold feet up, and the fire from from head life."(TianJing)