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(The Taiyang channel is the channel of cold water. It governs the exterior of the entire body.)

What are the symptoms of the Taiyang channel? The answer is: headache, stiffness of the neck and nape, fever, and aversion to cold are the symptoms. There is a distinction between deficiency evil (Xu Xie) and excess evil (Shi Xie).

A slow pulse (Mai Huan), spontaneous sweating (Zi Han), and aversion to wind (E Feng) indicate deficiency evil. Guizhi Tang (Cinnamon Twig Decoction) is appropriate. If after eight or nine days the disease has passed its time but remains unresolved, resembling malaria (Ru Nie Zhuang), with facial heat (Mian Re) and body itching (Shen Yang), this is because there was no slight perspiration. Guizhi Mahuang Ge Ban Tang (Guizhi and Mahuang Half-Half Decoction) is appropriate. Because sweating was not performed previously, it is necessary to induce sweating; however, since the duration is quite long, only slight sweating should be induced. If after taking Guizhi Tang, profuse sweating occurs, and the condition resembles malaria, occurring twice a day, this is because residual pathogenic factors remain. Guizhi Er Mahuang Yi Tang (Guizhi Twice Mahuang Once Decoction) is appropriate. After profuse sweating, the method of profuse sweating cannot be used again, yet residual pathogenic factors must be exhausted through sweating. However, the dosage of medicinal materials should be light.

A floating and tight pulse (Mai Fu Jin), absence of sweating (Wu Han), and aversion to cold (E Han) indicate excess evil. Mahuang Tang (Ephedra Decoction) is appropriate. If there is no sweating accompanied by irritability (Fan Zao), add Shigao (Gypsum Fibrosum), Shengjiang (Zingiberis Rhizoma Recens), and Dazao (Jujubae Fructus), named Da Qinglong Tang (Major Blue-Green Dragon Decoction). If there is dry retching (Gan Ou) and cough (Ke), remove Xingren (Armeniacae Semen Amarum), and add Wuweizi (Schisandrae Fructus), Ganjiang (Zingiberis Rhizoma), Banxia (Pinelliae Rhizoma), Xixin (Asari Radix et Rhizoma), and Shaoyao (Paeoniae Radix Alba), named Xiao Qinglong Tang (Minor Blue-Green Dragon Decoction). These two decoctions are modifications of Mahuang Tang and generally fall within the scope of Mahuang Tang.

These two methods treat the "exterior of the exterior."

What are the Fu-organ syndromes of Taiyang? The answer is: if exterior pathogenic factors do not resolve, they must enter the interior. The Bladder (Pang Guang) is the interior of the exterior. There is a distinction between Water Accumulation Syndrome (Xu Shui Zheng) and Blood Accumulation Syndrome (Xu Xue Zheng).

In Taiyang disease, if the patient has thirst (Kou Ke), irritability (Fan Zao), inability to sleep (Bu De Mian), a floating pulse (Mai Fu), difficulty in urination (Xiao Bian Bu Li), and vomiting immediately after drinking water (Shui Ru Ji Tu), this is Bladder Water Accumulation Syndrome. Wuling San (Five-Ling Powder) is appropriate.

In Taiyang disease, if the patient appears delirious (Ru Kuang), has hardness and fullness in the lower abdomen (Xiao Fu Ying Man), normal urination (Xiao Bian Zi Li), and a deep pulse (Mai Chen), this is Bladder Blood Accumulation Syndrome. Taoren Chengqi Tang (Peach Kernel Descending Qi Decoction) is appropriate.

These two methods treat the "interior of the exterior."

What are the transformed syndromes of Taiyang? The answer is: improper use of sweating and purging methods leads to transformations following Yin or Yang.

If purging is used when it should not be, followed by diarrhea with undigested food (Xia Li Qing Gu) and body pain (Shen Teng Tong), Sini Tang (Frigid Extremities Decoction) is appropriate to rescue the interior syndrome of diarrhea with undigested food, and Guizhi Tang is used to rescue the exterior syndrome of body pain.

If the disease presents with fever and headache (Fa Re Tou Tong), but the pulse is unexpectedly deep (Mai Fan Chen), and if it does not improve, with body pain (Shen Ti Teng Tong), the interior should be rescued first. Sini Tang is appropriate.

For profuse sweating, severe diarrhea, and cold extremities (Jue Leng), Sini Tang is the primary treatment.

In Taiyang disease, excessive sweating leads to continuous leakage of sweat (Lou Bu Zhi), aversion to wind (E Feng), difficulty in urination (Xiao Bian Nan), slight stiffness of the four limbs (Si Zhi Wei Ji), and difficulty in flexion and extension. Guizhi Jia Fuzi Tang (Guizhi Decoction with Added Aconite) is the primary treatment.

In Taiyang disease, excessive sweating disturbs the Ying-Blood (Rong Xue), while the Wei-pathogen retreats inward. The patient still has fever (Fa Re), palpitations in the heart region (Xin Xia Ji), dizziness (Tou Xuan), body tremors (Shen Dong), and a sensation of trembling as if wanting to fall to the ground (Zhen Zhen Yu Pi Di). Zhenwu Tang (True Warrior Decoction) is the primary treatment.

The above discusses how excessive sweating and purging damage healthy Qi and cause Yang deficiency. When Yang is deficient, many symptoms transform according to Shaoyin Yin. This is because Taiyang and Shaoyin are exterior-interior pairs.

When Yang is abundant internally, and Guizhi Tang is mistakenly taken, leading to profuse sweating, severe irritability and thirst that do not resolve, and a flooding pulse (Mai Hong Da), Bait Hu Jia Renshen Tang (White Tiger Decoction with Added Ginseng) is the primary treatment.

After Shanghan (Cold Damage) is treated with vomiting or purging, if it remains unresolved for seven to eight days, heat accumulates in the interior (Re Jie Zai Li), both exterior and interior are hot, there is occasional aversion to wind (Shi Shi E Feng), severe thirst (Da Kou), dry tongue with irritability (She Shang Zao Gan Er Fan), and a desire to drink several liters of water, Bait Hu Jia Renshen Tang is the primary treatment.

If Shanghan involves constipation for six or seven days, this is an interior syndrome; headache and fever are exterior syndromes. The exterior remains unresolved due to internal blockage. Purging resolves the interior harmony, and the exterior resolves spontaneously. Give Chengqi Tang.

If the patient has irritability and heat (Fan Re), which resolves with sweating, or resembles malaria with afternoon fever (Ri Bu Suo Fa Re), this belongs to Yangming. If the pulse is solid (Mai Shi), purging is appropriate; give Dachengqi Tang (Major Order the Qi Decoction). If the pulse is deficient (Mai Xu), sweating is appropriate; give Guizhi Tang.

If aversion to cold (E Han) occurs after sweating, it is due to deficiency. If there is no aversion to cold but only heat, it is due to excess. Harmonize the Stomach Qi; give Tiaowei Chengqi Tang (Regulate the Stomach Order the Qi Decoction).

In Taiyang disease, if unresolved, the pulses at Yin and Yang positions are both stagnant (Yin Yang Ju Ting). "Ting" means stagnant and unable to rise. Yin and Yang refer to the Cun and Chi positions. First, there will be chills and shivering (Zhen Li), followed by sweating for resolution. If only the Yang pulse (Cun) is slightly weak (Wei), resolve via sweating first. If only the Yin pulse (Chi) is slightly weak, resolve via purging. If purging is desired, Tiaowei Chengqi Tang is appropriate. Note that "pulse slightly weak" here refers to the "pulse stagnation" mentioned earlier.

The above discusses how improper sweating and purging lead to intense heat damaging Yin. When Yin is damaged, many symptoms transform according to Yangming Yang. This is because Taiyang and Yangming transmit sequentially.

What are the two major gates for treating Taiyang: sweating and promoting urination? The answer is: when evil damages Taiyang, the disease is in the Cold Water channel. Driving out water qi outward results in sweating; driving out water qi downward results in yellow phlegm/saliva accumulation anteriorly and prolonged urination posteriorly.

Taiyang is the Cold Water channel. At the initial stage of injury, sweating must be induced. Mahuang Tang induces sweating from the skin (Pi Fu); Guizhi Tang induces sweating from the meridians (Jing Luo); Gegen Tang induces sweating from the muscles (Ji Rou); Xiao Qinglong Tang induces sweating from below the heart (Xin Xia); Da Qinglong Tang induces sweating by releasing the Yang qi disturbed in the chest. These are the five methods of inducing sweating.

If sweating fails to eliminate all pathogens, water forms. If water is below the heart, causing dry retching and cough, Xiao Qinglong Tang is appropriate. If there is fever and irritability, thirst for water, and vomiting immediately after drinking, it is called Water Reversal (Shui Ni); Wuling San is appropriate. After sweating, if there is epigastric hardness and fullness (Xin Xia Pi Ying), belching with food odor (Yi Qi Shi Chou), water qi under the flanks (Xie Xia You Shui Qi), borborygmus and diarrhea (Fu Zhong Lei Ming Xia Li), although the pathology is in the abdomen, the root is in the heart region. Shengjiang Xiexin Tang (Fresh Ginger Drain the Epigastrium Decoction) is appropriate. This is water qi in the Upper Jiao. For conditions in the upper, disperse via sweating. If mistaken purging causes hardness and fullness from the heart to the lower abdomen, painful to touch (Shui Yu Qi Suo Jie), with a slow pulse (Mai Chi), it is called Major Chest Binding (Da Jie Xiong); Dayanxiong Tang (Major Inward-Sinking Chest Decoction) is appropriate. If the neck is also stiff, resembling soft spasm (Rou Dou Zheng), Dayanxiong Wan (Major Inward-Sinking Chest Pill) is appropriate. Generally, if the pathology extends downward, use decoctions; if it extends upward, use pills. If binding is only in the heart region, painful only on pressure, with a floating and slippery pulse (Mai Fu Hua), it is called Minor Chest Binding (Xiao Jie Xiong); the pathogen is still in the meridians. Xiaoxianxiong Tang (Minor Inward-Sinking Chest Decoction) is appropriate. If there are no heat signs, it is called Cold Excess Chest Binding (Han Shi Jie Xiong); Sanwu Baisan (Three-Material White Powder) is appropriate. If there is epigastric hardness and fullness, pain radiating to the flanks, dry retching, shortness of breath (Duan Qi), sweating without aversion to cold, and obstruction of the ascending and descending Qi of the Three Jiao, Shizao Tang (Ten Jujubes Decoction) is appropriate. This is water qi in the Middle Jiao. For middle fullness, drain internally. If there is headache, neck stiffness, mild fever (Xi Xi Fa Re), no sweating, epigastric fullness and slight pain, and difficulty urinating, it is because Bladder water does not move, Ying and Wei are unharmonized, and sweating cannot occur. Guizhi Qu Gui Jia Fuling Baizhu Tang (Guizhi Decoction with Cinnamon Removed and Poria and Atractylodes Macrocephala Added) is appropriate. This is water qi in the Lower Jiao. For conditions in the lower, drain via guiding.

The *Neijing* states: Above Taiyang, Cold Qi governs, which is the Root (Ben). Below the Root is the Manifestation (Jian). Below the Manifestation is the Mark (Biao). It also states: Taiyang follows both Root and Mark. It also states: Taiyang is the Opening. The *Lingshu·Re Bing Lun* states: On the first day of Shanghan, Juyang receives the pathogen, hence headache, neck pain, and stiffness of the waist and spine.

The *Shanghan Lun* states: For Taiyang disease, the pulse is floating, with headache, neck stiffness, and aversion to cold.

It also states: In Taiyang disease, with fever, sweating, aversion to wind, and a slow pulse, it is named Wind Strike (Zhong Feng).

It also states: In Taiyang Wind Strike, the Yang pulse floats and the Yin pulse is weak. Floating Yang indicates spontaneous heat; weak Yin indicates spontaneous sweating. With chilly aversion to cold, shivery aversion to wind, mild fever, nasal congestion (Bi Ming), and dry retching, Guizhi Tang is the primary treatment.

It also states: In Taiyang disease, with headache, fever, body pain, waist pain, joint pain, aversion to wind, no sweating, and wheezing, Mahuang Tang is the primary treatment.

Taiyang governs the exterior of the body, being the outermost layer of the Six Channels. Therefore, all exterior diseases belong to Taiyang, but there is a distinction between the "exterior of the exterior." Disease in the muscle interstices with sweating requires Guizhi Tang; disease in the skin surface without sweating requires Mahuang Tang. If these two methods are applied correctly, one dose can cure. If there is a faint pulse, aversion to cold, reddish face, and body itching, the pathogen desires to exit but cannot emerge abruptly; slight sweating is required for resolution. Guizhi Mahuang Ge Ban Tang is appropriate. If after taking Guizhi Tang, profuse sweating occurs, and the condition resembles malaria, occurring twice a day, this is muscle disease combined with exterior disease. Guizhi Er Mahuang Yi Tang is appropriate. These two formulas serve as assistants to the aforementioned two methods. However, they treat muscle and skin diseases, not meridian-acupoint diseases.

The meridian-acupoints of Taiyang are on the back. The *Neijing* states: When evil enters the acupoints, the waist and back become stiff. The *Shanghan Lun* uses Gegen Tang for neck/back stiffness without sweating and aversion to wind; and Guizhi Jia Gegen Tang (Guizhi Decoction with Added Kudzu Root) for neck/back stiffness with sweating and aversion to wind. These two formulas are also assistants to the aforementioned two methods. However, these two methods address the original Cold nature of Taiyang, using acrid-warm substances. If it is the marked Heat nature of Taiyang with spontaneous sweating, Guizhi Tang should not be used directly; Shaoyao Gancao Tang (Peony and Licorice Decoction) is appropriate. Since the symptoms are identical to Guizhi syndrome except for calf cramping, this is a combination of Taiyang marked heat and Shaoyin root heat. For no-sweating cases, Mahuang Tang should not be used; Maxing Ganji Tang (Ephedra, Apricot Kernel, Licorice, and Gypsum Decoction) is appropriate. Since the symptoms resemble Mahuang syndrome except for initial thirst, fever, and lack of aversion to cold, or burning heat after sweating, although classified separately as Warm Disease or Wind-Warmth, the prefix "Taiyang Disease" refers to Taiyang marked heat. This is clearly a specific case; without reading the *Neijing*, it cannot be understood. The mention of Guizhi Er Yuespi Tang is for marked heat sinking into interior Yin and transforming into heat, resulting in more heat than cold and a faint pulse. The text says "no Yang," meaning no exterior Yang. It says "do not sweat," meaning do not induce Taiyang exterior sweating. Thus, this decoction directs the pathogen outward from interior Yin. This can also serve as an assistant to the aforementioned two methods.

However, Taiyang is exterior but also has an interior aspect; the Bladder is the interior of Taiyang. For example, in Taiyang disease, with fever, no sweating, epigastric fullness, slight pain, and difficulty urinating, sweating is inappropriate. Guizhi Qu Gui Jia Fuling Baizhu Tang is appropriate; promoting urination leads to recovery. After sweating, if there is a floating pulse, difficulty urinating, slight fever, and polydipsia, or if Wind Strike with fever persists for six to seven days with irritability (exterior syndrome) and thirst for water (interior syndrome), termed Exterior-Interior Syndrome in the text, and vomiting after drinking water (Water Reversal Syndrome), both require Wuling San. Drinking warm water promotes sweating. This is the treatment for Exterior-Interior syndrome. As for Da Qinglong Tang, it is designed for heavy Mahuang syndrome with floating-tight pulse, body pain, no sweating, and irritability. Xiao Qinglong Tang is for unresolved exterior with water retention below the heart causing cough and choking, transforming the cold-dispersing nature of Da Qinglong Tang into a sweating-and-diuretic formula. It is a modification of Mahuang Tang, staying within its scope. Guizhi Qu Shaoyao Tang (Guizhi Decoction with Peony Removed) is for mistaken purging in Guizhi syndrome causing rapid pulse and chest fullness. Guizhi Qu Shaoyao Jia Fuzi Tang adds Aconite when the pulse becomes faint instead of rapid and aversion to cold returns. Guizhi Jia Fuzi Tang is for excessive sweating causing leakage, aversion to wind, difficulty urinating, and limb stiffness. This addresses Yang loss from profuse sweating and fluid depletion from Yang loss; Aconite secures Shaoyin Yang, stopping sweating and preserving fluids. Pushing further, if irritability recurs after disease resolution post-sweating, or if irritability worsens initially after taking Guizhi Tang, punctling Fengchi and Fengfu points and then giving Guizhi Tang resolves it. Its application is broad, essentially covering the eight characters of Guizhi syndrome: headache, fever, sweating, aversion to wind. Note that Taiyang treatment revolves around Guizhi and Mahuang Tangs. After Mahuang Tang, Guizhi Tang may follow; after Guizhi Tang, Mahuang Tang does not. Taiyang is a Cold Water channel; root-cold cases are common, marked-heat cases are rare. If both root and mark are involved, more heat than cold indicates recovery. Practitioners must prioritize this. This discussion centers Taiyang disease on Guizhi and Mahuang Tangs consistently, clearer than any ancient commentator. Other methods are extensions of these two, not separate laws.

Taiyang governs the outermost layer. Pathogens enter from outside and must be expelled. If the first two decoctions fail, pathogens may remain in the channel or invade others, requiring Shaoyang pivot transformation to reach Taiyang and exit. Thus, Xiao Chaihu Tang (Minor Bupleurum Decoction) is a key formula in the Taiyang chapter. Modern practitioners mistakenly designate it as the primary Shaoyang formula, which is far off. Whether Guizhi or Mahuang syndrome, on days 3, 9, or 15 (Shaoyang ruling periods), pivot transformation is needed. Alternating chills and fever indicate pivot failure and open-close dysfunction, with chest-hypochondriac fullness. The chest is the passage of Taiyang; the hypochondrium is the pivot of Shaoyang. Silence, anorexia, and irritability indicate depressed Shen mechanism and disharmonious Stomach Qi causing retching. If affecting Heart but not Stomach, there is chest irritability without retching. If affecting Yangming Dryness, there is thirst. If affecting Taiyin Spleen Qi, abdominal pain. If affecting Jueyin Liver Qi, hypochondriac hardness. If affecting Shaoyin Kidney Qi, palpitations and difficulty urinating. If Taiyang借助 Shaoyang pivot shows outward trend, there is no thirst and slight body heat. If affecting Taiyin Lung Qi, cough. All are treated primarily with Xiao Chaihu Tang, modified based on optional symptoms. If Taiyang disease passes its time unresolved, start with Xiao Chaihu Tang. If retching continues, epigastric urgency, and slight vexation, use Dachengqi Tang to purge and calm the Stomach. Any Chaihu formula in the Taiyang chapter either guides pathogen seeking pivot exit or resolves long-standing stagnation via pivot guidance. This is facilitating natural flow, an advanced assistant to Mahuang and Guizhi Tangs.

Expanding further, Taiyang Qi moves externally to the chest and diaphragm; if it cannot go out, it affects the interior, manifesting as Major/Minor Chest Binding syndromes (excess) or various Xiexin (Drain the Epigastrium) syndromes (deficiency). Taiyang Qi ascends to the head and descends to the abdomen; if it cannot ascend, it affects the lower, binding in the uterus from the back (Taoren Chengqi Tang) or from the chest (Didang Tang). Are these not due to misapplication or non-application of Guizhi and Mahuang Tangs? The direct treatment of Taiyang meridian has only about twenty clauses; others are adaptive (Quan Bian) and mediating (Wo Xuan) methods. If practitioners examine pulse (slow/tight) and symptoms (sweating/no sweating) and apply sweating methods like Guizhi/Mahuang, pathogens are expelled. If combining with Yangming, Shaoyang, or all three Yang channels, clear and resolve using Gegen Tang (for Taiyang-Yangming diarrhea), Gegen Jia Banxia Tang (for vomiting without diarrhea), Huangqin Tang (for Taiyang-Shaoyang diarrhea), Huangqin Jia Banxia Shengjiang Tang (for vomiting), or Bait Hu Tang (for all three Yangs). Abdominal fullness indicates Yangming heat; heaviness indicates Taiyang heat; difficulty turning indicates Shaoyang heat; foul mouth/facial grease indicates Shaoyang Fu heat; delirium indicates Yangming Fu heat; enuresis indicates Taiyang Fu heat. Confirming three-Yang combination and spontaneous sweating justifies Bait Hu Tang. This is direct treatment.

Considering individual constitution differences (deficiency/excess, Yin/Yang organ disparities), pre-existing phlegm-fluids,痞气 (Pi Qi), throat dryness, strangury, sores, sweating, nosebleeds, or post-coital/post-traumatic/post-partum blood loss, one cannot simply use Mahuang/Guizhi methods. Instead, Xuanfu Daizhe Shi Tang treats epigastric hardness and belching after sweating/vomiting/purging due to weak Stomach Qi and rebellious Phlegm-Qi. Linggui Zhugan Tang (Poria, Cinnamon, Atractylodes, and Licorice Decoction) treats fluid retention after vomiting/purging. *Jinkui Yaolue* states: Fluid retention in the diaphragm causes wheezing/fullness and hard epigastrium; phlegm-fluid in the heart causes hypochondriac fullness and dizziness; severe tremors indicate hidden fluid. Sweating agitates the meridians because there is no pathogen to expel, only disturbing meridian Qi. Chengqi Tang treats constipation, headache, fever, and nosebleeds by directing upward heat downward. Xiaojianzhong Tang treats palpitations and irritability in early Shanghan by tonifying Middle Qi to generate Heart Blood. Zhigancao Tang treats knotted/intermittent pulse and palpitations by activating Kidney Yin into the vessels. Sini Tang treats deep pulse with fever/headache/body pain by supporting Kidney Yang to rescue collapse. These are adaptive methods. Using Guizhi/Mahuang may still have errors of excess or deficiency. Incomplete sweating allows pathogen transmission to other channels, causing jaundice or blood accumulation. Fire-induced sweating in Wind Strike causes yellowing, nosebleeds, difficult urination, hiccups, delirium, and grasping movements; treatment is possible only after urination improves. If Guizhi syndrome exterior remains with heat binding in Bladder and delirium, blood discharge cures it. If lower abdomen is tense/knot-like, Taoren Chengqi Tang offers mild purging. If Mahuang syndrome exterior remains with faint/deep pulse and delirium, pathogen binds in lower abdomen causing hardness/fullness (Blood-Heat in Interior), jaundice, deep-knotted pulse, normal urination (blood not water); if blood cannot discharge spontaneously, strong purging with Didang Tang is needed. Excessive sweating damaging Yang causes trembling and muscle twitching (Zhenwu Tang syndrome). Blood loss after sweating with body pain and deep-slow pulse requires Guizhi Jia Shaoyao Shengjiang Renshen Xinjia Tang (Newly Added Guizhi Decoction with Peony, Ginger, and Ginseng). Heart Qi deficiency after sweating with hand-over-heart preference for pressure requires Guizhi Gancao Tang. Kidney Qi deficiency after sweating with umbilical palpitation and impending Ben Tun requires Fuling Guizhi Gancao Dazao Tang. Middle Qi damage after sweating causing bloating requires Houpo Shengjiang Gancao Renshen Banxia Tang. Aversion to cold after sweating indicating dual Yin-Yang deficiency requires Shaoyao Gancao Fuzi Tang. Further sweating methods are discussed conceptually without formulas. These are mediating methods; students should study them carefully.