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Shaoyin disease characterized by a fine, deep, and rapid pulse indicates that the pathogen is in the interior. Sweating therapy should not be used.
The presence of rapidity within the deep and fine pulse is a sign of evil heat entering the interior. Once evil heat enters the interior, sweating is contraindicated. If sweating is induced, it will disturb the meridians, leading to depletion of blood and loss of Yang Qi; this serves as a warning.

In Shaoyin disease presenting with cold extremities (Si Ni), the patient may experience cough, palpitations, difficulty urinating, abdominal pain, or diarrhea with a sensation of heaviness in the anus. These conditions are primarily treated with Si Ni San (Four Counterflow Powder).
The four limbs are the root of all Yang meridians. When Yang pathogenic factors transmit to Shaoyin and sink into the interior, failing to communicate with Yang, it leads to cold extremities and diarrhea, damaging the Yang Qi of the Spleen and Stomach (Earth element). Therefore, Chai Hu (Bupleuri Radix) is urgently needed to raise the sunken Yang pathogen; Zhi Shi (Aurantii Fructus Immaturus) to break internal stagnation and heat; Gan Cao (Glycyrrhizae Radix et Rhizoma) to assist the Spleen and Stomach Yang in its transformation; and Bai Shao (Paeoniae Radix Alba) to gather the displaced Yin fluids. This is indeed the definitive method for resolving Shaoyin disease involving Yin-Yang obstruction. One must not use purgation methods simply because there is internal Yang-heat accumulation. Generally, in Shang Han (Cold Damage) diseases, preserving Yang is paramount. Cold extremities indicate an advance of Yin. If bitter-cold purgatives are used again, Yang will be further depleted. Hence, the warning: "For those with cold extremities, do not use purgation."
If there is cough, add Wu Wei Zi (Schisandrae Fructus) and Gan Jiang (Zingiberis Rhizoma) each at 5 fen; these also treat diarrhea.
If there are palpitations, add Gui Zhi (Cinnamomi Ramulus) at 5 fen.
If there is difficulty urinating, add Fu Ling (Poria) at 5 fen.
If there is abdominal pain, add Fu Zi (Aconiti Lateralis Radix Praeparata) one piece, soaked and broken.
If there is diarrhea with anal heaviness, first boil Xie Bai (Allii Macrostemonis Bulbus) in five sheng of water until reduced to three sheng. Strain the dregs. Add three square-inch spoons of Si Ni San powder to the decoction and boil until reduced to one and a half sheng. Divide into two doses and take warm.

Although this syndrome belongs to Shaoyin, it is essentially disharmony of the Spleen and Stomach. Thus, Clear Yang cannot reach the four extremities. Using Si Ni San to regulate the Spleen and Stomach and dissipate heat-stagnation in the Yin aspect is the correct treatment. Regarding the addition of Fu Zi for abdominal pain, I have doubts. Typically, abdominal pain caused by sunken Yang pathogen should only be harmonized with Xiao Jian Zhong Tang (Minor Construct the Middle Decoction). The use of Fu Zi here implies that although the syndrome involves Yang pathogen, the patient internally has deep cold and stagnation, and due to a robust physique capable of tolerating Yang-warming drugs, hot herbs can be added to the Spleen-Stomach regulating formula. This remains a harmonizing method, not warming the meridians to assist Yang. As stated later, adding Xie Bai for diarrhea with anal heaviness shows that even if heat-stagnation is expelled via diarrhea, it does not quickly clear; thus, the urgent task is to rapidly cleanse turbidity. Adding Wu Wei Zi and Gan Jiang for cough follows the principle of treating according to the manifestation; one must not fear using hot herbs to treat heat syndromes.

In Shaoyin disease, cough combined with diarrhea and delirium results from coercion by fire therapy. Forcing sweat in Shaoyin disease inevitably leads to difficult urination.
The Shaoyin meridian enters the abdomen from the foot, ascends along the throat, and surrounds the tongue base, hence often causing sore throat. Its branch connects to the Lung, so cough occasionally occurs. Now, forcing sweat with fire causes heat pathogen to attack upward with fire power, resulting in cough, as Metal dislikes Fire. Attacking downward causes diarrhea due to fire forcing fluids through orifices. Attacking inward causes delirium as fire burns and disturbs the Shen (Spirit). Urination becomes difficult because all three symptoms obstruct urinary function. Lung injury by fire impairs Bladder Qi transformation; excessive Large Intestine urgency causes water and grain to mix; Heart Pericardium burning dries the Small Intestine. How can Shaoyin be forcibly sweated?

In Shaoyin disease, if there is cold extremities without sweat, forcing sweat will inevitably move the blood. It is unknown which orifice it will exit from: either mouth and nose, or eyes. This is called "Lower Jue and Upper Exhaustion," a difficult-to-treat condition.
Forcibly inducing sweat in Shaoyin moves blood, causing it to reverse and exit through Yang orifices, as sweating agents are Yang-natured. Exit via mouth/nose or eyes is more critical than exit via Yin orifices. "Lower Jue" refers to Shaoyin being central, unable to sweat, with deep heat. "Upper Exhaustion" refers to Shaoyin blood exhausting by flowing out from above. Since Shaoyin naturally has little blood, and it flows upward reversely, it is hard to treat. However, if heat is in the Bladder causing hematochezia, is it not because there is abundant blood and exiting via stool is favorable?

Shaoyin disease with sore throat in the throat is primarily treated with Ban Xia San Ji Tang (Pinellia Powder and Decoction).
Shaoyin disease where the throat is injured, sores form, speech is impossible, and voice is lost is primarily treated with Ku Jiu Tang (Bitter Wine Decoction).
Sun Tai heat pathogen invading Shaoyin causes Yin fire to attack the throat with phlegm, causing pain. Ban Xia (Pinelliae Rhizoma) clears phlegm, Gui Zhi (Cinnamomi Ramulus) disperses pathogen, and Gan Cao (Glycyrrhizae Radix et Rhizoma) relieves urgency. In severe cases, throat injury and sores prevent speech; this is Yin pathogen knotting upward, making cold purgation unsuitable. Ban Xia opens knots, Egg White moistens the throat, and Ku Jiu (Vinegar) reduces swelling and heals sores to overcome Yin-heat. Overcoming Yin-heat preserves Yin. Clearing phlegm resolves heat, following the Nei Jing principle of "moistening dryness with flow." This parallels the Ma Huang Sheng Ma Tang (Ephedra and Ligusticum Decoction) pattern for Liver Jue throat bi.

Shaoyin disease progressing from two to four or five days, presenting with abdominal pain, difficulty urinating, incessant diarrhea, and pus-blood in stool is primarily treated with Tao Hua Tang (Peach Blossom Decoction).
Abdominal pain and difficulty urinating indicate Shaoyin heat pathogen. Incessant diarrhea with pus-blood indicates Lower Jiao slipping and sliding (incontinence). Slipping precludes cold herbs. Gan Jiang (Zingiberis Rhizoma) and Shi Li (Kaolinitum) use acrid-astringent properties to disperse pathogen and secure leakage; Jing Mi (Oryzae Semen) adds sweetness to tonify middle deficiency. Treating lower disorders requires securing the middle first. If Middle Qi does not sink, slipping stops spontaneously. This is a conforming treatment method. Notes claiming Gan Jiang indicates interior cold are incorrect.

Shaoyin disease with diarrhea and pus-blood in stool is primarily treated with Tao Hua Tang (Peach Blossom Decoction). Shaoyin disease with pus-blood in stool can be treated with acupuncture.
If diarrhea precedes pus-blood, use Tao Hua Tang. If no diarrhea but only pus-blood, acupuncture can disperse heat. Without acupuncture, consider Bai Tou Weng Tang (Pulsatillae Decoction).
If accompanied by dry throat, irritability, and inability to sleep, Huang Lian E Jiao Tang (Coptis and Donkey-Hide Gelatin Decoction) is appropriate.

Shaoyin disease with spontaneous discharge of clear water, pure green color, epigastric pain, and dry mouth requires urgent purgation with Da Cheng Qi Tang (Major Order the Qi Decoction).
Heat pathogen transmitting to Shaoyin forces fluids into spontaneous discharge. The substance is clear without turbidity, color green without yellow/red, showing extreme Yang heat resembling Yin pathogen. However, Yang pathogen transmits from Upper Jiao, causing epigastric pain and dry mouth. Yin pathogen would cause fullness without pain and a neutral mouth without thirst, lacking this withered appearance. Urgent purgation saves Yin.
These are Shaoyin transmitted heat syndromes.

Shaoyin disease persisting six to seven days with abdominal distension and constipation requires urgent purgation with Da Cheng Qi Tang (Major Order the Qi Decoction).
Shaoyin diarrhea is mostly deficiency-cold (clear grains, slipping) or pus-blood, treated with warm herbs. Transmitted Yang pathogen internal knotting causes clear water diarrhea; warm-heat disease causes thirst with diarrhea; both suit purgation to clear heat. Here, six-seven days of constipation and distension show heat transforming to Yang Ming, becoming Stomach Excess. Hence urgent purgation. But why call this Shaoyin after six-seven days of distension/constipation? It likely followed prior sore throat, diarrhea, irritability, and thirst up to day five or six.
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Jue Yin disease presents with Xiao Ke (Wasting-Thirst). Qi and Blood are forced by Shaoyin heat to exit via the two Yin orifices, as Yin descends. Dang Gui Si Ni Tang (Angelica Four Counterflow Decoction) harmonizes Ying and disperses exterior, plus unblocking Bladder, is appropriate.
The previous paragraph describes Shaoyin heat pathogen transferring to the Bladder Fu organ.