《黄帝内经·素问·刺要论》
该刺筋的，不要伤及骨，若骨受伤，就会影响肾脏的正常功能，以致到冬天时，易患腹胀、腰痛的病症。
刺筋无伤骨，骨伤则内动肾，肾动则冬病胀腰痛。
When inserting into the tendons, do not damage the bones, because if the bones are damaged, it will affect the normal function of the kidneys, leading to an easy susceptibility to bloating and low back pain in the winter.