《黄帝内经·灵枢·刺节真邪》
四时八节的虚风邪气侵袭于人体，人就会感到寒意而瑟瑟战栗，毫毛竖起，腠理开张，虚邪深入向内，伤害至骨，就形成为骨痹；虚邪伤害至筋，就造成筋挛；损伤于脉，就造成血痹，血液淤滞不通，就形成痈；虚邪伤害于肌肉，与卫气相搏击，阳邪偏胜就形成热症，阴邪偏胜就形成寒症；真气为寒邪所迫而离去，真气离去则造成阳虚，阳气既虚则寒邪伤害皮肤，邪气向外发散，就会使腠理张开，毫毛摇动，邪气往来而行，就会发痒；邪气滞留不去，就形成痹症；卫气不能流通畅行，就形成麻木不仁之症。
虚邪之中人也，洒淅动形，起毫毛而发腠理。其入深，内搏于骨，则为骨痹；搏于筋，则为筋挛；搏于脉中，则为血闭不通，则为痈；搏于肉，与卫气相搏，阳胜者则为热，阴胜者则为寒，寒则真气去，去则虚，虚则寒；搏于皮肤之间，其气外发腠理，开毫毛，摇气往来，行则为痒，留而不去则痹，卫气不行则为不仁。
When empty wind evil qi from the four seasons and eight solar terms invades the human body, people will feel cold and shiver, their hairs will stand on end, and their pores will open. The empty evil penetrates deeply inward, damaging the bones, forming bone numbness; empty evil damages the tendons, causing tendon cramps; damages the meridians, causing blood numbness, blood stasis and不通, forming carbuncles; empty evil damages the muscles, fighting with the defensive qi, yang evil prevails and forms heat, yin evil prevails and forms cold; true qi is forced away by cold evil, true qi leaves and causes yang deficiency, yang deficiency and cold evil damages the skin, evil qi radiates outward, pores open, hairs move, evil qi comes and goes, it will itch; evil qi stays and does not go, numbness will form; defensive qi can not circulate smoothly, numbness will form.