少阳胆经。胆无出入。主半表半里。其经起于目锐 。上头角。络耳中。循胸胃胁。行
身之
不从标本。从乎中治。只用小柴胡汤和解。别无他药。禁汗。禁吐。禁下。禁利小便。
太阴脾经。乃三阴之首。故名太阴。其经起于足大指。上行至腹。络于咽。连舌本。循
身之前
。口渴。发黄茵陈汤。小便赤。大便闭。是太阴本病。桂枝大黄汤。初病起。不热。不渴。
头不痛。便怕寒。胸腹满痛。或吐泻。手足冷。小便清白。或呕呃。是本经直中寒邪。宜理
中汤初病起。不热不渴。胸腹满痛。手足冷。气口沉细。此内伤生冷。宜治中汤。
少阴肾经。人之根蒂也。三阴交中名曰少阴。其经起于足心涌泉穴。上行贯脊。循喉。
络舌本。下注心胸。行身之前。其症引衣蜷卧。恶寒。口躁咽干。谵语。口渴。便闭。脉沉有力
。此热邪传入少阴本病。大承气汤急下之。初起身热。面赤足冷。本经自受夹阴伤寒。标本俱
病也。麻黄附子细辛汤。温经散寒。若阴躁欲坐泥水井中。虽欲饮而不受。面赤足冷。脉沉
或脉虽大。按之如无。此阴极发躁。本病也。宜四逆合生脉散。退阴回阳。身热烦躁。面赤
足冷。脉数大无力。此虚阳伏阴。标本俱病。宜加减五积散。温解表里。初病起。头不痛。
口不渴。身不热。便厥冷蜷卧。腹痛吐泻。或战栗。面如刀刮。脉沉细。此少阴直中寒邪。
宜四逆汤。急温之。无热恶寒。面青。小腹绞痛。足冷脉沉。蜷卧不渴。或吐利昏沉。手足
甲青。冷过肘膝。胀满不受药。此夹阴中寒本病也。宜人参四逆汤温补之。六经之中。惟此
经难辨。以燥渴便闭。脉沉实知其热。脉沉迟别其寒。
足少阳胆经。胆腑没有直接出入的表里配合，主要主管半表半里的病位。其经脉起始于目外角，上行至头角，联络耳中，沿胸部、胃部和胁肋部行走，经过身体侧面。治疗时不遵循标本常规，而应从中焦气机调和入手，仅使用小柴胡汤进行和解，没有其他药物替代。禁止使用发汗法，禁止使用催吐法，禁止使用泻下法，禁止使用利小便法。
足太阴脾经。是三阴经的首经，所以称为太阴。其经脉起始于足大趾，向上行至腹部，联络咽喉，连接舌根，沿身体前面行走。若出现口渴、发黄的症状，用茵陈汤；若小便赤红、大便闭塞，这是太阴经的本病，用桂枝大黄汤。若是初起发病，不发热、不口渴，头部不痛，反而怕冷，胸腹部胀满疼痛，或者呕吐腹泻，手足冰冷，小便清亮，或者干呕呃逆，这是本经直接中受寒邪，宜用理中汤。若是初起发病，不发热不口渴，胸腹部胀满疼痛，手足冰冷，人迎脉（或寸口脉）沉细，这是内伤生冷所致，宜用治中汤。
足少阴肾经。是人体的根本。在三阴经交汇中名为少阴。其经脉起始于足心的涌泉穴，向上贯穿脊柱，沿喉咙行走，联络舌根，向下注入心胸，沿身体前面行走。其症状表现为想蜷缩着衣服躺卧，恶寒，口中烦躁咽干，说胡话，口渴，大便闭塞，脉象沉而有力，这是热邪传入少阴经的本病，应用大承气汤急下攻逐。若是初起身热，面红脚冷，这是本经自受夹阴伤寒，标本同病，应用麻黄附子细辛汤温经散寒。若是阴盛躁动，想要坐在泥水井中，虽然想喝水但又不接受，面红脚冷，脉象沉，或者脉虽大但按之空虚，这是阴极发躁的本病，宜用四逆汤合生脉散，以退阴回阳。若是身热烦躁，面红脚冷，脉数大但无力，这是虚阳伏于阴中的表现，标本同病，宜用加减五积散温解表里。若是初起发病，头不痛，口不渴，身不热，四肢厥冷蜷卧，腹痛呕吐腹泻，或者战栗，面色如刀刮般惨白，脉象沉细，这是少阴经直接中受寒邪，宜用四逆汤急温之。若无热恶寒，面色青，小腹绞痛，脚冷脉沉，蜷卧不渴，或者呕吐腹泻神志昏沉，手足指甲发青，寒冷超过肘膝，腹胀满不能服药，这是夹阴中寒的本病，宜用人参四逆汤温补之。在六经之中，只有这一经最难辨别，通过燥渴便闭、脉沉实来判断是热证，通过脉沉迟来区分是寒证。
Foot-Shaoyang Gallbladder Meridian. The Gallbladder has no direct interior-exterior pairing for entry and exit, primarily governing the half-exterior half-interior level. Its meridian originates at the outer canthus of the eye, ascends to the frontal angle of the head, connects with the middle of the ear, follows along the chest, stomach, and hypochondrium, and runs along the lateral aspect of the body. Treatment does not follow the standard or root principles but harmonizes from the middle; only Xiaochaihu Tang (Minor Bupleurum Decoction) is used for harmonization, with no other medicines applicable. Sweating (diaphoresis), vomiting (emesis), purgation (downward draining), and promoting urination are all contraindicated.
Foot-Taiyin Spleen Meridian. It is the first of the three Yin meridians, hence named Taiyin. Its meridian originates at the big toe of the foot, ascends to the abdomen, connects with the pharynx, links to the root of the tongue, and runs along the anterior aspect of the body. If thirst and jaundice occur, Yinchin Tang (Artemisia Capillaris Decoction) is used. If urine is red and stool is obstructed, this is the primary disease of the Taiyin meridian, and Guizhi Dahuang Tang (Cinnamon Twig and Rhubarb Decoction) is used. If the illness begins initially without fever or thirst, without headache, but with aversion to cold, fullness and pain in the chest and abdomen, or vomiting and diarrhea, cold hands and feet, clear urine, or dry heaving and hiccups, this is a direct invasion of cold pathogen into this meridian, and Lizhong Tang (Regulate the Middle Decoction) is appropriate. If the illness begins initially without fever or thirst, with fullness and pain in the chest and abdomen, cold hands and feet, and a deep and fine pulse at the cunkou (radial artery), this is caused by internal injury from raw and cold foods, and Zhizhong Tang (Regulate the Middle Decoction) is appropriate.
Foot-Shaoyin Kidney Meridian. It is the root of human life. Among the intersection of the three Yin meridians, it is called Shaoyin. Its meridian originates at the Yongquan acupoint (KI1) on the sole of the foot, ascends through the spine, follows the throat, connects to the root of the tongue, descends into the heart and chest, and runs along the anterior aspect of the body. Symptoms include curling up while lying down, aversion to cold, oral irritability and dry throat, delirium, thirst, constipation, and a deep yet forceful pulse. This is the primary disease of the Shaoyin meridian due to heat pathogen transmission, and Dachengqi Tang (Major Order the Qi Decoction) should be used urgently to purge downward. If there is initial fever, red face, and cold feet, this is a Jia-Yin Shanghan (Cold Damage with Hidden Yin Deficiency) affecting this meridian directly, involving both root and branch, and Mahuang Fuzi Xixin Tang (Ephedra, Aconite, and Asarum Decoction) is used to warm the meridians and dissipate cold. If there is yin restlessness, desiring to sit in a muddy well, wanting to drink but unable to accept fluids, red face, cold feet, deep pulse, or a large pulse that feels empty upon pressure, this is the primary disease of extreme yin generating restlessness, and Sini Tang (Frigid Extremities Decoction) combined with Shengmai San (Generate the Pulse Powder) is appropriate to withdraw yin and restore yang. If there is body heat and irritability, red face, cold feet, and a rapid, large but forceless pulse, this is deficient yang hidden within yin, involving both root and branch, and Jiajian Wuji San (Modified Accumulation-Resolving Powder) is appropriate to warm and resolve exterior and interior. If the illness begins initially without headache, thirst, or body heat, with cold extremities and curling up, abdominal pain, vomiting, and diarrhea, or shivering, pale face like a scraped knife, and a deep, fine pulse, this is a direct invasion of cold pathogen into the Shaoyin meridian, and Sini Tang (Frigid Extremities Decoction) is appropriate for urgent warming. If there is absence of heat with aversion to cold, blueish complexion, severe colic in the lower abdomen, cold feet and deep pulse, curling up without thirst, or vomiting, diarrhea, lethargy, cyanotic fingernails, cold extending beyond elbows and knees, abdominal distension preventing medication intake, this is the primary disease of Jia-Yin Zhonghan (Cold Strike with Hidden Yin), and Renshen Sini Tang (Ginseng and Frigid Extremities Decoction) is appropriate for warming and tonifying. Among the six meridians, this one is the most difficult to differentiate; heat is known by dryness, thirst, constipation, and deep-solid pulse, while cold is distinguished by deep-slow pulse.