《内经》曰∶肾之合骨也，其荣发也。多食甘，则骨痛而发落（甘益脾，脾克水，肾病也）。女子七岁肾气实，齿
更发长，五七阳明脉衰，面始焦，发始堕。丈夫八岁肾气实，齿更发长，五八肾气衰，发堕齿槁。
《巢氏病源》曰∶足少阳胆之经，其荣在须。足少阴肾之脉，其华在发。冲任二脉为十二经之海，其别络上唇口。
若血盛则荣于头发，故须发美；若血气衰弱，经脉虚竭，不能荣润，则发须脱落。《内经》∶冲任脉别络唇口。妇人数
脱血（月月行经，故曰数脱血），冲任之脉不营于口唇，故须不生焉。宦者去其宗筋，伤其冲脉，血泻不复，皮肤内
结，唇口不荣，故须不生。有人未尝有所伤，不脱于血，其须不生何也？此天之所不足也。冲任不盛，宗筋不成，有气
无血，唇口不荣，故须不生。髭须不黑，而皆黄赤，多热多气；白者，少血少气；美眉者，太阳多血，通髯极须者，少
阴多血；美须者，阳明多血。
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《黄帝内经》说：肾与骨相合，其荣华表现在头发上。如果多吃甘味食物，就会引起骨痛和脱发（因为甘味补益脾土，脾土克制肾水，从而导致肾病）。女子到了七岁，肾气充盛，牙齿更换，头发开始生长；到了三十五岁（五七），阳明脉的气血开始衰弱，面部开始憔悴，头发开始脱落。男子到了八岁，肾气充实，牙齿更换，头发开始生长；到了四十岁（五八），肾气开始衰退，头发脱落，牙齿干枯。
《诸病源候论》说：足少阳胆经的荣华表现在胡须上。足少阴肾经的荣华表现在头发上。冲脉和任脉是十二经脉的海，它们的别络上行至口唇周围。如果血液旺盛，就能滋养头发，所以胡须和头发美观；如果气血衰弱，经脉空虚枯竭，不能滋养润泽，就会导致胡须和头发脱落。《黄帝内经》说：冲脉和任脉的别络联系口唇。妇女经常失血（因为每月行经，所以称为经常失血），冲脉和任脉的气血不能营养口唇，所以胡须不生。宦官割去了宗筋，损伤了冲脉，血液泻出后无法恢复，皮肤内部结聚，口唇得不到营养，所以胡须不生。有的人未曾受过伤害，也没有失血，为什么胡须不生呢？这是先天禀赋不足造成的。冲脉和任脉不旺盛，宗筋不成形，只有气而没有血，口唇得不到营养，所以胡须不生。胡须颜色黑而发亮，说明体内热气多、气盛；胡须变白，说明血少气少；眉毛美观的人，太阳经血液充足；两颊及下巴胡须浓密的人，少阴经血液充足；胡须美观的人，阳明经血液充足。
The *Huangdi Neijing* (Yellow Emperor's Inner Canon) states: The Kidney corresponds to the bones, and its flourishing manifests in the hair. Excessive consumption of sweet flavors leads to bone pain and hair loss (Sweet flavor tonifies Spleen Earth; Spleen Earth overacts on Kidney Water, resulting in Kidney pathology). At age seven, a woman's Kidney Qi becomes substantial, her teeth change, and her hair grows. At age thirty-five (five times seven), the Yangming Meridian begins to decline, her face starts to wither, and her hair begins to fall out. At age eight, a man's Kidney Qi becomes substantial, his teeth change, and his hair grows. At age forty (five times eight), his Kidney Qi begins to decline, his hair falls out, and his teeth become dry and brittle.
The *Chushi Bingyuan* (Source Book of Diseases by Chao Yuanfang) states: The flourishing of the Foot-Shaoyang Gallbladder Meridian manifests in the beard. The flourishing of the Foot-Shaoyin Kidney Meridian manifests in the hair. The Chong and Ren Mai (Penetrating and Conception Vessels) are the seas of the twelve meridians; their branch collaterals ascend to the lips and mouth. If blood is abundant, it nourishes the hair, resulting in beautiful beard and hair; if Qi and blood are weak, and the meridians are empty and exhausted, failing to nourish and moisten, then the beard and hair will fall out. The *Neijing* states: The branch collaterals of the Chong and Ren Mai connect to the lips and mouth. Women frequently lose blood (due to monthly menstruation, hence termed "frequent blood loss"); consequently, the Chong and Ren Mai fail to nourish the lips and mouth, so beards do not grow. Eunuchs have their Zongjin (genital tendons/sinews) removed, damaging the Chong Mai; blood is lost and does not recover, internal skin binding occurs, and the lips and mouth are not nourished, so beards do not grow. What about those who have suffered no injury and have not lost blood, yet do not grow beards? This is due to congenital insufficiency. The Chong and Ren Mai are not vigorous, the Zongjin fails to form, there is Qi but no Blood, the lips and mouth are not nourished, so beards do not grow. Beards that are black and lustrous indicate excessive heat and abundant Qi; white beards indicate deficient Blood and Qi. Those with beautiful eyebrows have abundant Blood in the Taiyang Meridian; those with full cheek and chin beards have abundant Blood in the Shaoyin Meridian; those with beautiful beards have abundant Blood in the Yangming Meridian.