《黄帝内经·素问·风论》
风邪由足太阳膀胱经侵入，循行到各经脉中及其腧穴，散布在肌肉中间，与卫气相搏结，使卫气运行的道路不通利，所以邪气充胀肌肉而产生疮疡。若卫气凝涩而不能运行，则肌肤麻木不知痛痒，继续发展下去即为半身不遂的 偏枯 。
风气与太阳俱入，行诸脉俞，散于分肉之间，与卫气相干，其道不利，故使肌肉愤䐜而有疡；卫气有所凝而不行，故其肉有不仁也。
Wind evil invades from the foot Taiyang bladder meridian, travels to each meridian and its acupoints, spreads in the muscles, fights against Weiqi, and blocks the circulation of Weiqi. Therefore, the evil qi fills the muscles and causes sore ulcers. If Weiqi is stuck and cannot run, the skin will be numb and unable to feel pain or itching. If it continues to develop, it will be hemiplegia.