须、鬓、阴、腋诸毛详前三阳上下气血多少篇，兹不复赘。
肺主身之皮毛。肾合三焦膀胱。三焦膀胱者，腠理毫毛其应。五脏伤败，毛悴色夭者，死于脏气所不胜
之时也。手太阴者，行气而温于皮毛者也。故气绝则不荣皮毛，皮毛焦则津液去，皮节爪枯毛折。手少阴气绝
则脉不通，脉不通则血不流，血不流则髦色不泽。足少阴者，伏行而濡骨髓者也。气绝则骨不濡，肉不能着
也。骨肉不相亲则肉软却，故齿长而垢，发无泽。肾，其华在发，故丈夫八岁肾气实，齿更发长。五八肾气
衰，发堕齿枯。（以上《内经》。）
发者血之余也。心与小肠主血，故小肠绝者，发干直如麻，不得曲伸。小儿病，其头毛皆上逆者死。
其发枯黄者，心肾血气俱不足也。（以上《脉经》。）
足厥阴肝脉与督脉会于巅，故勇士之怒，发立上指。平人肝热，其气上冲，头皮一块肿痛，发根
为之粗硬而逆起。（以下四节添加。）
平人眉忽生一长毫，异于众毛，拔之三、五日复生者，胆
中血热也。在小儿必生急风。《脉经》曰∶胆绝，眉为之倾。
平人鼻中忽生一长毫，粗硬异于众毛者，肺中血热也。拨之三、五日即复生，久不治，即生肺痈发
背。夏子益《奇疾方》有鼻生长毫，硬如铁丝，触之其痛彻心，为肺大热也。
发通五脏，而尤切于心肾。故病温疫热毒，及服毒药，
与饮酒大醉者，以冷水浸其发。又喉蛾急疗等证，察有赤发者，急拔之，是热血上逆也。
The condition of the hair on the beard, temples, genitals, and axillae is detailed in the previous section "On the Abundance and Scarcity of Qi and Blood in the Three Yang Meridians," so it will not be repeated here.
The Lung governs the skin and body hair (maomao). The Kidney combines with the Sanjiao (Triple Burner) and Bladder. The Sanjiao and Bladder manifest their function through the interstices (coulī) and fine body hair. If the Five Viscera are damaged and deteriorated, presenting with emaciated hair and a sallow, lifeless complexion, death occurs during the time when the controlling organ's qi is at its peak. The Hand-Taiyin Lung Meridian circulates Qi and warms the skin and hair. Therefore, when Lung Qi fails, it cannot nourish the skin and hair; if the skin and hair become dry, body fluids are lost, leading to withered skin, joints, nails, and broken hair. When Heart Qi of the Hand-Shaoyin Meridian fails, the vessels become obstructed; obstruction leads to stagnant blood; stagnant blood results in a lack of luster in the eyebrows and hair. The Foot-Shaoyin Kidney Meridian runs deep within to moisten the bone marrow. When Kidney Qi fails, the bones are not moistened, and muscles cannot adhere to them. When flesh and bone lose their affinity, the muscles become flaccid and recede, causing the teeth to appear elongated and covered with tartar, and the hair to lose its luster. The Kidney manifests its splendor in the hair; thus, 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 withered. (Above from *Neijing*.)
Hair is the surplus of Blood. The Heart and Small Intestine govern Blood; therefore, when Small Intestine Qi fails, the hair becomes dry, straight like hemp, and unable to bend or stretch. In children with illness, if all the hair on the head stands upright, it indicates a fatal condition. If the hair is withered and yellow, it indicates insufficiency of Qi and Blood in both the Heart and Kidney. (Above from *Maijing*.)
The Foot-Jueyin Liver Meridian intersects with the Du Meridian at the vertex; thus, when a brave person is angry, their hair stands erect pointing upward. In ordinary people, Liver Heat causes Qi to rush upward, resulting in localized swelling and pain on the scalp, where the hair roots become coarse, hard, and stand on end. (The following four sections are additions.)
If an ordinary person suddenly grows a single long hair among the eyebrows that differs from the surrounding hairs, which regrows three to five days after plucking, this indicates Heat in the Blood of the Gallbladder. In children, this must lead to Ji Feng (acute wind/convulsions). *Maijing* states: "When Gallbladder Qi fails, the eyebrows collapse."
If an ordinary person suddenly grows a single long hair in the nose that is coarser and harder than the surrounding hairs, which regrows three to five days after plucking, this indicates Heat in the Blood of the Lung. If left untreated for a long time, it may develop into Fei Yong (lung abscess) or Fa Bei (back carbuncle). Xia Zi Yi's *Qiji Fang* records cases of long hairs growing in the nose, hard as iron wire, causing heart-piercing pain upon touch, which is due to severe Heat in the Lung.
Hair connects with the Five Viscera, particularly closely with the Heart and Kidney. Therefore, in cases of warm epidemic heat-toxin, ingestion of toxic drugs, or severe alcohol intoxication, one should soak the hair in cold water. Additionally, in conditions such as Hou E (tonsillitis) and Ji Liao (acute boils), if red hairs are observed, they should be plucked immediately, as this indicates the counterflow of hot blood.