直中阴经不发热。腹痛恶寒四肢厥。唇青面黑是真阴。四逆理中真妙诀。（此太阴
直中寒症其脉沉细无力宜温之）
四逆汤中姜一两。生附减半去皮尖。一两甘草水煎服。厥而下利用之痊。理中甘草用干姜
。白术人参是的当。若是内中加附子。更名附子理中汤。
阳邪传入少阴中。口燥咽干谵语同。便实绕脐时硬痛。腑中燥屎却宜攻。
按伤寒五六日内。及足少阴肾经受之。其脉起于足之涌泉穴。上行贯脊。循喉咙。络舌
注心中。行身之前。终于 府穴也。其症则口燥咽干。便实谵语。或绕脐腹痛。是腑中燥屎
使然。与直中全无干涉。宜下之。如大承气及调胃承气汤是也。
麻黄附子细辛汤。发表温经
恶寒无热厥如冰。吐泻交加腹内疼。六脉沉迟阴毒盛。身如被杖爪唇青。
此少阴直中寒症也。其脉沉细无力。宜温之。如四逆汤理中汤之类是也。
舌卷囊拳消渴甚。四肢厥冷乍还温。烦满便坚多属热。六一顺气可旋吞。
按伤寒六七日内。乃足厥阴肝经受之。其脉起于足大指之大敦穴。循阴器。抵小腹。络
于肝
。行身前之侧。终于期门穴也。其症则烦满而囊缩。筋急而唇青。在男子则囊拳。在女子廷孔
急痛。痛引小腹。廷孔者。阴之深处也。亦宜分传经直中治之。其脉沉实有力当下。如六一
顺气汤之类是也。沉迟无力当温。如回阳救急汤之类是也。
六一顺气芍药标。柴胡枳实大黄硝。黄芩浓朴同甘草。可代三黄功更高。
直中阴经的病证不发热。出现腹痛、恶寒、四肢厥冷。嘴唇发青、面色发黑是真阴寒证的典型表现。使用四逆汤（Sini Decoction，回阳救逆之剂）和理中汤（Lizhong Decoction，温中散寒之剂）是真正的妙法。（这是太阴经直中寒症，其脉象沉细无力，适宜用温法治疗）
四逆汤中包含干姜一两。生附子减半，去皮去尖。甘草一两，水煎服。若见四肢厥冷且下利，服用此方可痊愈。理中汤中甘草、干姜、白术、人参最为恰当。如果在其中加入附子，便更名为附子理中汤（Fuzi Lizhong Decoction）。
阳热邪气传入少阴经。出现口燥、咽干、谵语（神志不清，胡言乱语）。大便干结，脐周时时硬痛。腑中有燥屎应当攻下。
按：伤寒病在五六日内，邪气传入足少阴肾经。其经脉起于足底的涌泉穴，上行贯穿脊柱，沿喉咙，联络舌根，注入心中，行于身体前侧，终于俞府穴。其症状表现为口燥咽干，大便干结，谵语，或绕脐腹痛，这是腑中燥屎所致。这与直中寒证毫无关系，适宜用下法。如大承气汤（Da Chengqi Decoction）及调胃承气汤（Tiaowei Chengqi Decoction）等方剂。
麻黄附子细辛汤（Mahuang Fuzi Xixin Decoction），用于发表温经。
恶寒无发热，四肢厥冷如冰。呕吐腹泻交加，腹部疼痛。六脉沉迟，阴毒盛极。身体感觉像被棍棒打过一样疼痛，指甲嘴唇发青。
这是少阴经直中寒症。其脉象沉细无力，适宜用温法。如四逆汤、理中汤之类方剂。
舌头卷缩，睾丸上缩，口渴严重。四肢厥冷，时而回暖。烦闷胀满，大便坚硬，多属热证。六一顺气汤（Liuyi Shunqi Decoction）可以迅速服用。
按：伤寒病在六七日内，邪气传入足厥阴肝经。其经脉起于足大趾的大敦穴，沿阴器，抵小腹，联络肝脏。行于身体前侧，终于期门穴。其症状表现为烦闷胀满而睾丸收缩，筋脉拘急而嘴唇发青。在男子则表现为睾丸上缩，在女子则表现为阴户紧急疼痛，疼痛牵引小腹。廷孔者，指阴部深处。也应当区分传经热证和直中寒证来治疗。其脉象沉实有力者当下，如六一顺气汤之类；脉象沉迟无力者当温，如回阳救急汤（Huiyang Jiuji Decoction）之类。
六一顺气汤以芍药为标，包含柴胡、枳实、大黄、芒硝。黄芩、厚朴同甘草一起，可替代三黄泻心汤的功效且效果更高。
Direct invasion of the Yin meridians presents without fever. Abdominal pain, aversion to cold, and cold limbs are observed. Cyanosis of the lips and black complexion indicate true Yin-cold syndrome. Sini Decoction (Nìxī Tāng) and Lizhong Decoction (Lǐzhōng Tāng) are truly excellent prescriptions. (This refers to direct invasion of cold into the Taiyin meridian; the pulse is deep, fine, and forceless, warranting warming treatment.)
Sini Decoction contains one tael of dried ginger. Raw Aconite Root (Fuzi, 附子) is halved, with skin and tips removed. One tael of Licorice Root (Gancao, 甘草) is decocted in water. It cures cold limbs accompanied by diarrhea. In Lizhong Decoction, Licorice Root, dried ginger, Atractodes Rhizome (Baizhu, 白术), and Ginseng Root (Renshen, 人参) are appropriately used. If Aconite Root is added to it, it is renamed Fuzi Lizhong Decoction (Fùzǐ Lǐzhōng Tāng).
Yang pathogenic factors transmitting into the Shaoyin meridian present with dry mouth, dry throat, and delirious speech. Constipation and periodic hard pain around the umbilicus occur. Dry fecal matter in the fu organs should be purged.
Note: Within five or six days of Shanghan (Cold Damage), the disease affects the Foot-Shaoyin Kidney Meridian. Its vessel originates at Yongquan (KI1), ascends through the spine, follows the throat, connects with the tongue root, enters the heart, runs along the anterior aspect of the body, and terminates at Shufu (BL27). Symptoms include dry mouth and throat, constipation, delirium, or abdominal pain around the umbilicus, caused by dry fecal matter in the fu organs. This is unrelated to direct invasion. Purging is indicated, such as with Da Chengqi Decoction (Dà Chéngqì Tāng) or Tiaowei Chengqi Decoction (Tiáowèi Chéngqì Tāng).
Mahuang Fuzi Xixin Decoction (Máhuáng Fùzǐ Xìxīn Tāng) releases the exterior and warms the meridians.
Aversion to cold without fever, cold limbs like ice. Vomiting and diarrhea occurring together with abdominal pain. The six pulses are deep and slow, indicating severe Yin-toxin accumulation. The body feels as if beaten with a club, with cyanotic nails and lips.
This is direct invasion of cold into the Shaoyin meridian. The pulse is deep, fine, and forceless, warranting warming treatment, such as with Sini Decoction or Lizhong Decoction.
Tongue curling, retraction of the testes, and severe thirst. Cold limbs that occasionally warm up. Irritability, fullness, and hard stool mostly indicate heat syndrome. Liuyi Shunqi Decoction (Liùyī Shùnqì Tāng) can be taken rapidly.
Note: Within six or seven days of Shanghan, the disease affects the Foot-Jueyin Liver Meridian. Its vessel originates at Dadun (LR1) on the big toe, follows the genitalia, reaches the lower abdomen, and connects with the Liver. It runs along the lateral anterior aspect of the body and terminates at Qimen (LR14). Symptoms include irritability, fullness, and testicular retraction; tendon stiffness and cyanotic lips. In men, this manifests as testicular retraction; in women, urgency and pain in the vaginal opening, radiating to the lower abdomen. "Tingkong" refers to the deep interior of the yin organs. Treatment should distinguish between transmitted-heat and direct-invasion patterns. If the pulse is deep, solid, and forceful, purging is indicated, such as with Liuyi Shunqi Decoction; if the pulse is deep, slow, and forceless, warming is indicated, such as with Huiyang Jiuji Decoction (Huíyáng Jiùjí Tāng).
Liuyi Shunqi Decoction features Peony Root (Shaoyao, 芍药) as a key component, containing Bupleurum Root (Chaihu, 柴胡), Immature Bitter Orange (Zhishi, 枳实), Rhubarb Root (Dahuang, 大黄), and Mirabilite (Xiaoshuang, 芒硝). Combined with Scutellaria Root (Huangqin, 黄芩), Magnolia Bark (Houpo, 厚朴), and Licorice Root, it can replace Sanhuang Xiexin Decoction with even higher efficacy.