《黄帝内经·灵枢·本藏》
口唇上下端正、匀称，脾脏位置端正；口唇不端正而一侧偏高者，脾脏位置偏斜。
唇上下好者，脾端正；唇偏举者，脾偏倾也。
Uniform and symmetrical shape of the upper and lower lip indicate a proper spleen position; lips that are not symmetrical and protrude on one side indicate a deflected spleen position.