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The Shaoyin (Lesser Yin) Kidney Meridian is the storehouse of Water and Fire. When pathogenic factors invade this meridian, they transform according to the patient's deficiency or excess: either transforming into Water to manifest as Cold, or transforming into Fire to manifest as Heat. The transformation into Water results in Yin-Cold pathogens, which constitutes the Root (Ben); the transformation into Fire results in Yang-Heat pathogens, which constitutes the Branch (Biao). The pulse for Yin pathogens is deep, fine, and faint; the pulse for Yang pathogens is deep, fine, and rapid. Their clinical manifestations also differ. Yin pathogens cause drowsiness without fever; Yang pathogens cause drowsiness accompanied by vexation. Yin pathogens cause aversion to cold in the back with a neutral mouth sensation; Yang pathogens cause aversion to cold in the back with a dry mouth. Yin pathogens cause sore throat without swelling; Yang pathogens cause sore throat with swelling. Yin pathogens cause abdominal pain with diarrhea containing undigested food; Yang pathogens cause abdominal pain with watery diarrhea or pus and blood in the stool. Yin pathogens manifest as external heat with red complexion, internal cold with loose stools, and clear urine; Yang pathogens manifest as external cold with cold limbs, internal heat with constipation, and dark urine. These are the pulses and symptoms of the Root and Branch, Cold and Heat of Shaoyin disease. Treatment based on the Root should generally use warming methods to dispel Cold and restore Yang; treatment based on the Branch should generally use purging methods to clear Heat and preserve Yin. The timing for restoring Yang and preserving Yin is critical; it depends entirely on careful clinical investigation to distinguish between Root/Branch and Cold/Heat, allowing for urgent treatment so that success may be achieved. Slight delay will render treatment ineffective.

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Shaoyin disease is characterized by a faint and fine pulse, and a desire to sleep.

[Annotation]
The Shaoyin Kidney Meridian is a storehouse where Yin is abundant. When Shaoyin is invaded by pathogens, Yang Qi becomes weak, resulting in a fine pulse. Wei Qi (Defensive Qi) moves through Yang to keep one awake, and through Yin to induce sleep. When Shaoyin is invaded, Yin becomes abundant, and Wei Qi spends more time moving through Yin, causing the patient to desire sleep. This is the outline of Shaoyin disease; henceforth, whenever "Shaoyin disease" is mentioned, it refers to these specific pulses and symptoms.

[Collected Annotations]
Fang Youzhi stated: Shaoyin refers to the Kidney Meridian, located at the lowest part, originating from below the little toe. The *Ling Shu* states: It governs diseases generated within, manifesting as lethargy and a desire to sleep. Humans mirror Heaven and Earth; when the Qi of Heaven and Earth moves through Yang, it opens into day; when it moves through Yin, it closes into night. Similarly, when human Qi moves through Yang, one is active and awake; when it moves through Yin, one is quiet and asleep. Patients who only desire sleep do so because pathogens have lodged in the Yin aspect.

Zhang Lu stated: This describes the general pulse and symptom of Shaoyin. Shaoyin belongs to Water and is static. Even if Heat pathogens transmit to this meridian, a previously floating and large pulse must change to deep and fine; previously restless and hot symptoms must change to lethargy and drowsiness. One must distinguish: a deep, fine, and rapid pulse with a dry mouth indicates Heat; a deep, faint, and fine pulse with a neutral mouth sensation indicates Cold. Clear distinction here ensures no errors.

Cheng Yingmao stated: All Yin pulses are deep, differing from the floating pulse of Taiyang, which needs no further explanation. The Yangming pulse is large; "faint" is the opposite of "large." The Shaoyang pulse is wiry; "fine" is the opposite of "wirly." A pulse that is both deep and faint/fine confirms a Yin syndrome.

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In Shaoyin disease, upon initial onset, there is contrary fever and a deep pulse; Ma Huang Fu Zi Xi Xin Tang (Ephedra, Aconite, and Asarum Decoction) is the primary treatment.

[Annotation]
Shaoyin disease refers to the symptom of desiring sleep. A deep pulse here means the pulse is not faint and fine but deep. Upon initial onset, fever should not be present, yet contrary fever appears. This indicates interior Cold of Shaoyin combined with exterior Heat of Taiyang. Therefore, Ma Huang Fu Zi Xi Xin Tang (Ephedra, Aconite, and Asarum Decoction) is appropriate to warm the interior and induce sweating, protecting Yang Qi, thereby resolving the Cold pathogens affecting both layers (exterior and interior).

[Collected Annotations]
Fang Youzhi stated: Fever indicates pathogens in the exterior; a deep pulse indicates Shaoyin's position in the North and interior. Because it resides in the interior, fever despite exterior pathogens is termed "contrary." Since pathogens are in the exterior, not the interior, Ma Huang (Ephedrae Herba) is used to disperse them. Because the root is Yin and the branch is Cold, Fu Zi (Aconiti Lateralis Radix Praeparata) is used to warm. Xi Xin (Asari Radix et Rhizoma) is acrid and warm, connecting to Shaoyin; it assists the principal herbs as a guide specifically entering this meridian.

Cheng Zhi stated: The method for releasing the exterior in the Three Yin meridians differs from the Three Yang. For the Three Yin, one must use warming-meridian drugs to release the exterior, with Shaoyin being particularly critical. Thus, formulas that disperse pathogens and warm the meridian are used, allowing deeply entrenched exterior pathogens to exit while preventing internal Yang from dissipating outward.

Cheng Yingmao stated: If fever occurs immediately upon onset, combined with anhidrosis typical of Yin meridians, some clinicians calculate days and symptoms, often using Ma Huang (Ephedrae Herba) while avoiding Fu Zi (Aconiti Lateralis Radix Praeparata). They fail to realize that a deep pulse arises because the person's Kidney Meridian has been chronically cold, and interior Yang cannot coordinate, making the pulse deep rather than floating. A deep pulse belongs to Shaoyin, where sweating is contraindicated. However, since fever occurs immediately upon onset, indicating concurrent Taiyang, sweating is necessary. One must use Fu Zi (Aconiti Lateralis Radix Praeparata) to warm the meridian and assist Yang, anchoring the interior so Yang does not escape with sweat, before Ma Huang (Ephedrae Herba) can be safely combined with Xi Xin (Asari Radix et Rhizoma).

Lin Lan stated: Both transmitted pathogens and Yin-Cold present with a deep pulse. Deepness indicates the disease is in the interior but does not exclusively indicate Cold. In Shaoyin syndromes, a pulse that is faint, fine, and deep differs significantly from one that is fine, rapid, and deep regarding their respective Cold and Heat natures.