《黄帝内经·灵枢·经脉》
胃里有寒，手鱼部的络脉多呈青色；胃里有热，鱼际的络脉则呈现赤色。
胃中寒，手鱼之络多青矣。胃中有热，鱼际络赤。
If there is cold in the stomach, the connecting vessel in the Fish Palace often manifests as cyan; if there is heat in the stomach, the connecting vessel in the Fish's Border manifests as red.