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Whenever one is injured by cold, a heat disease occurs. Even if the heat is severe, death will not ensue (The *Neijing* states: "When wind and cold invade humans, causing all body hairs to stand erect and skin pores to close, heat results; this is why cold injury causes heat." The *Zhenjing* states: "Those with much heat are easy to cure; those with much cold are difficult to cure." Thus, even severe heat does not lead to death. This is discussed in detail in the *Suwen: Re Lun*, and should be studied carefully.) However, if one suffers from "Liang Gan" (simultaneous involvement of exterior and interior meridians) due to cold, death is inevitable (Simultaneous involvement of exterior and interior is called Liang Gan).

If the pulse at both Cun and Chi positions is floating, it indicates Taiyang meridian disease. It typically manifests on the first or second day because its vessel connects to the Fengfu acupoint, leading to headache, stiffness of the neck and spine, and rigidity of the lower back (Taiyang has abundant blood but scarce Qi and is the head of the three Yang meridians; its Qi floats outward, hence the floating pulse at Cun and Chi, indicating pathogenic factors have just entered the skin and are at the exterior. It manifests on days 1-2. Fengfu is an acupoint name. The Foot-Taiyang Bladder Meridian enters the brain from the vertex, emerges separately, and descends to the nape, thus connecting to Fengfu. Its course runs along the shoulders, inside the paravertebral muscles, reaching the waist; therefore, pathology presents as headache, neck stiffness, and spinal rigidity).

If the pulse at both Cun and Chi positions is long, it indicates Yangming meridian disease. It typically manifests on the second or third day because its vessel surrounds the nose and connects to the eyes, leading to fever, eye pain, nasal dryness, and inability to sleep (Yangming has abundant Qi and Blood; a long pulse at Cun and Chi indicates pathogens merging into Yangming with overflowing Qi and Blood. If Taiyang pathology persists and transmits to Yangming, it manifests on days 2-3. The vessel surrounding the nose refers to the Yangming Meridian of Hand-Yangming starting at the nose, crossing the forehead, and connecting to the eyes. The Yangming Meridian ascends to the vertex, emerges, and connects to the eye system. Fever occurs because Yangming governs the muscles; the *Zhenjing* states that excess Yangming Qi causes heat in the anterior body. Eye pain and nasal dryness result from pathogenic factors lodging in the vessel. Inability to sleep occurs because Stomach Qi rebels and fails to follow its normal course; the *Neijing* states, "When the Stomach is disharmonious, sleep is disturbed.")

If the pulse at both Cun and Chi positions is wiry (Xian), it indicates Shaoyang meridian disease. It typically manifests on the third or fourth day because its vessel follows the hypochondrium and connects to the ears, leading to hypochondriac pain and deafness (The *Neijing* states: "Shaoyang within Yang corresponds to Spring Qi; it has less blood and more Qi, and the Spring pulse is wiry." A wiry pulse at Cun and Chi indicates Shaoyang invasion. If Yangming pathology persists from days 2-3 and transmits to Shaoyang, it manifests on days 3-4. Hypochondriac pain and deafness result from vessel congestion and obstruction. Gao Wenzhuang's edition reads: "The vessel enters the kidney from the vertex, emerges separately, descends alongside the spine to the waist." Generally, transmission from Taiyang to Jueyin proceeds from exterior to interior, requiring sequential use of sweating and purging methods. Some cases bypass the three Yang meridians and directly involve Taiyin, Shaoyin, or Jueyin; see later sections for treatment based on the specific meridian involved).

For these three meridians (Taiyang, Yangming, Shaoyang), if the pathogens have not yet entered the Fu organs, they can be cured by inducing sweating (Pathogens in the three Yang meridians affect the exterior, so the method should be sweating. However, the three Yang meridians can also directly enter the Fu organs; if they do, purging is indicated. Hence, "those not yet entering the Fu organs can be cured by sweating." Note: In the *Suwen*, the character "Fu" (Organ) is written as "Zang" (Viscera); this reasoning is superior, as Fu belongs to Yang and Zang to Yin. Moreover, transmission to Yangming implies entering the Fu organ?).

If the pulse at both Cun and Chi positions is deep and fine, it indicates Taiyin meridian disease. It typically manifests on the fourth or fifth day because its vessel spreads through the Stomach and connects to the throat, leading to abdominal fullness and dryness of the throat (When Yang reaches its extreme, Yin is affected. After pathogens traverse the three Yang meridians, they subsequently transmit to the Yin meridians. Involvement of Yang meridians is considered exterior; involvement of Yin meridians is considered interior. Exterior pathogens present with Yang pulses; interior pathogens present with Yin pulses. Yang pathogens transmitting to Yin cause internal sinking of pathogens, resulting in Taiyin disease with deep and fine pulses at Cun and Chi. Transmission from the three Yang to Taiyin occurs on days 4-5. Pathogens entering Yin gradually generate heat. Abdominal fullness and throat dryness result from Spleen meridian congestion generating heat).

If the pulse at both Cun and Chi positions is deep, it indicates Shaoyin meridian disease. It typically manifests on the fifth or sixth day because its vessel penetrates the Kidney, connects to the Lung, and attaches to the root of the tongue, leading to dry mouth, dry tongue, and thirst (Shaoyin corresponds to Kidney Water, which tends downward; thus, Shaoyin disease presents with deep pulses at Cun and Chi. On the fifth day, if Taiyin pathogens persist, they transmit to Shaoyin by days 5-6. This explains why Shaoyin disease manifests on days 5-6. Humans injured by cold develop heat diseases; initially cold, it eventually transforms into heat. Dry mouth, dry tongue, and thirst in Shaoyin disease indicate pathogens entering the interior and heat intensifying. The *Huoren Shu* states: "The text mentions 'Shaoyin on days 1-2' referring to cases where pathogens enter Shaoyin immediately upon illness, bypassing the three Yang meridians." Generally, Shanghan originating in Yang meridians involves Taiyang; originating in Yin meridians involves Shaoyin. For illnesses lasting 1 to 12-13 days where Taiyang symptoms persist, treat Taiyang. If Shaoyin symptoms appear immediately upon onset, treat Shaoyin directly without first treating Juyang (Taiyang). Cold invading Taiyang causes fever and aversion to cold; invading Shaoyin causes aversion to cold without fever).

If the pulse at both Cun and Chi positions is slightly slow (Huan), it indicates Jueyin meridian disease. It typically manifests on the sixth or seventh day because its vessel follows the genitalia and connects to the Liver, leading to irritability, fullness, and retraction of the scrotum (A slow pulse is associated with Wind. A slightly slow Jueyin pulse indicates transmission to Jueyin with intense heat resembling Wind. Manifestation on days 6-7 occurs because Shaoyin pathogens transmit to Jueyin. Irritability, fullness, and scrotal retraction result from heat gathering internally. [Lou] states: "Fanman" refers to irritability and fullness in the lower abdomen. The following text says, "On the twelfth day, Jueyin disease declines, the scrotum relaxes, and there is slight lower abdominal depression," meaning the previous scrotal retraction is now accompanied by lower abdominal irritability/fullness, causing slight depression).

For these three meridians (Taiyin, Shaoyin, Jueyin), if the pathogens have already entered the Fu organs, they can be cured by purging (Pathogens in the three Yin meridians affect the interior, so the method should be purging. However, the three Yin meridians can also remain in the Jing (vessel) level; if in the vessel, sweating is appropriate. Hence, "those having entered the Fu organs can be cured by purging." The Classics state: "Physicians facing illness must examine carefully." Regarding the phrase "having entered the Fu organs," this may be a misplaced slip from the Yangming section, as the *Suwen* states only: "If all three Yin and three Yang meridians, five Zang and six Fu organs are diseased, Ying and Wei circulation stops, and the five Zang become blocked, death ensues." The three Yin meridians utilize sweating, purging, and warming methods, not merely purging).

If suffering from Liang Gan (simultaneous exterior-interior cold injury): On day one, Taiyang is affected, simultaneously involving Shaoyin, presenting with headache, dry mouth, irritability, fullness, and thirst. On day two, Yangming is affected, simultaneously involving Taiyin, presenting with abdominal fullness, fever, anorexia, and delirious speech. On day three, Shaoyang is affected, simultaneously involving Jueyin, presenting with deafness, scrotal retraction, and cold limbs. If water and grain cannot be taken and consciousness is lost, death occurs on day six. If all three Yin and three Yang meridians, five Zang and six Fu organs are affected, Ying and Wei circulation ceases, and Zang-Fu communication is blocked, leading to death (Simultaneous disease of Yin and Yang, with damage to both exterior and interior, is called Liang Gan. Because both Yin and Yang meridians are affected, symptoms of both appear. During transmission, Yin and Yang meridians transmit together. Day one headache is Taiyang; dry mouth, irritability, and thirst are Shaoyin. By day two, Taiyang transmits to Yangming, and Shaoyin transmits to Taiyin. Fever and delirium are Yangming; abdominal fullness and anorexia are Taiyin. By day three, Yangming transmits to Shaoyang, and Taiyin transmits to Jueyin. Deafness is Shaoyang; scrotal retraction and cold limbs are Jueyin. Inability to take fluids and loss of consciousness indicate Stomach Qi blockage. The *Neijing* states: "After the five Zang are damaged and six Fu organs blocked, with Ying and Wei stopped, death occurs three days later." Why? Qibo answers: "Yangming is the leader of the twelve meridians, with abundant Qi and Blood; thus, loss of consciousness occurs. After three days, its Qi is exhausted, leading to death." This means after three days, all six meridians are diseased, Ying and Wei cannot circulate internally and externally, and Zang-Fu Qi cannot communicate vertically and horizontally. By day six, Zang-Fu Qi is exhausted, and Ying and Wei are severed, leading to death. Note: Taiyin can transmit to Shaoyin, but Shaoyin cannot transmit to Taiyin (this is reverse transmission, so this explanation is flawed). Taiyang (Bladder) and Shaoyin (Kidney) are paired; Taiyin (Spleen) and Yangming (Stomach) are paired; Shaoyang (Gallbladder) and Jueyin (Liver) are paired. Yin follows Yang, like sisters-in-law who rank by husband's age, not their own.

On the first day of Shanghan, Taiyang is affected. If the pulse remains quiet, transmission does not occur. If there is a strong desire to vomit, or if there is restlessness and the pulse is rapid and urgent, transmission has occurred (Taiyang governs the exterior. On day one, Taiyang is invaded; by day two, it should transmit to Yangming. If the pulse is weak, it does not transmit to Yangming. Stomach channel invasion causes vomiting. Cold pathogens transmitting inward transform into heat. Strong desire to vomit, restlessness, and rapid/urgent pulses indicate Taiyang cold transforming into heat and transmitting to Yangming).

On the second and third days of Shanghan, if Yangming and Shaoyang symptoms are absent, transmission has not occurred (Absence of Yangming and Shaoyang symptoms on days 2-3 indicates pathogens have not transmitted and remain in the Taiyang channel).

On the third day of Shanghan, the three Yang meridians' pathology is exhausted, and the three Yin meridians should be affected. If the patient can eat and does not vomit, it indicates the three Yin meridians are not affected (On day four, exterior pathogens transmit inward; if the interior is disharmonious, eating and vomiting occur. Since the patient eats and does not vomit, transmission to Yin is ruled out; the pathogen remains in Yang).

Question: On the third day of Shanghan, the pulse is floating, rapid, and faint, and the patient's body is cool and harmonious. What is this? Answer: This indicates the disease is about to resolve. Resolution often occurs at midnight. If the pulse resolves while floating, there will be continuous sweating. If the pulse resolves while rapid, the patient will be able to eat. If the pulse resolves while faint, there will be profuse sweating. On the third day, if the Shaoyang pulse becomes small, the disease is about to end (See discussion on bitter taste and dry tongue).

For those not suffering from Liang Gan, without further transmission or mixed pathogens, by the seventh day, Taiyang disease declines, and headaches subside. By the eighth day, Yangming disease declines, and fever subsides. By the ninth day, Shaoyang disease declines, and hearing slightly improves. By the tenth day, Taiyin disease declines, abdominal fullness reduces to normal, and appetite returns. By the eleventh day, Shaoyin disease declines, thirst stops, tongue dryness resolves, and sneezing occurs. By the twelfth day, Jueyin disease declines, the scrotum relaxes, lower abdominal depression subsides, vital Qi disperses, and the patient regains mental clarity. Taiyang headache resolving after seven days occurs because the meridian cycle is complete. To prevent further transmission, needle the Foot-Yangming meridian to stop transmission and ensure recovery.

If, on the sixth or seventh day, the pulse becomes large, accompanied by severe irritability, locked jaw, and inability to speak, restlessness indicates impending resolution. If Shanghan lasts six to seven days without high fever but with restlessness, this indicates Yang pathogens entering Yin. If the condition persists beyond thirteen days without improvement (improvement means cessation of disease), and the Cun and Chi pulses are depressed, it is a critical danger.

If additional pathogenic factors are contracted, transforming into other diseases, treat according to the existing compromised patterns. If both Yin and Yang pulses are excessive, and cold is re-contracted, it transforms into Wen Nue (Warm Malaria) (Excessive Cun and Chi pulses with initial heat followed by cold suggest Xiaochaihu Tang; initial cold followed by heat suggests adding Cinnamon Twig, i.e., Chaihu Jia Guizhi Jiang Tang; heat only suggests Baihu Jia Guizhi Tang. With sweating, thirst, red scanty urine, pre-existing miasma, or intolerance to local conditions with severe vomiting, use Wuling San). If Yang pulses are floating and slippery, and Yin pulses are soft and weak, exposure to wind transforms it into Feng Wen (Wind-Warmth) (Feng Wen features flaccid limbs, headache, fever, spontaneous sweating without relief, panting, floating pulses at Cun and Chi, lethargy, and drowsiness. Treat Shaoyin and Jueyin; do not induce sweating). If Yang pulses are surging and rapid, and Yin pulses are solid and large, exposure to warmth transforms it into Wendu (Warm-Toxin), the most severe condition (Wendu invariably causes macules/rash). If Yang pulses are soft and weak, and Yin pulses are wiry and tight, exposure to warm Qi transforms it into Wen Yi (Warm Epidemic), originating from winter cold injuring leading to Warm Disease; see subsequent sections for pulse variations and treatments.

Dai states: Shanghan initially attacks Taiyang and transmits sequentially; this is a generalization. However, variations exist: some originate in Yang and immediately affect Shaoyin; some involve food stagnation affecting the Spleen (Taiyin), causing immediate abdominal fullness and pain; some do not follow the meridian sequence, such as directly attacking Yangming upon onset, not always starting with Taiyang. Some remain confined to one meridian; some transmit to only one or two meridians, not necessarily involving all. One must not rigidly adhere to sequence but treat according to symptoms. Thus, Shanghan often presents with exterior signs; Zhang Zhongjing stated: "Even if many days have passed, if exterior signs exist, sweating is appropriate; even if few days have passed, if interior signs exist, purging is appropriate."

Hai states: Taiyang (Water of Yang within Yang) is the head of the three Yang meridians; it can transmit via the meridian sequence or skip meridians. Yangming (Earth of Yang within Yang) is the master of the Central Earth, governing intake but not output. Transmission from Taiyang to Yangming is called "Sequential Transmission." Shaoyang (Wood of Yang within Yang) transmits upward to Yangming and downward to Taiyin. Transmission from Taiyang to Shaoyang is called "Skipping Transmission." Taiyin (Earth of Yin within Yin) transmits upward to Shaoyang (smooth) or downward to Shaoyin (reverse). Transmission from Taiyang to Taiyin is called "Misguided Purging Transmission." Shaoyin (Water of Yin within Yin) transmits upward to Taiyin (smooth) or downward to Jueyin (reverse). Transmission from Taiyang to Shaoyin is "Exterior to Interior Transmission." Jueyin (Wood of Yin within Yin) transmits upward to Shaoyin (excess) or again to Taiyin (self-recovery).

Hai further states: Taiyang (Juyang) is the head of all Yang meridians. Bladder meridian disease with thirst indicates transmission to its root (Chuan Ben). Transmission from Taiyang to Yangming (Stomach Earth) is Sequential Transmission, caused by incomplete sweating, diuresis, and residual pathogens penetrating inward. Transmission from Taiyang to Shaoyang (Gallbladder Wood) is Skipping Transmission, caused by failing to use Mahuang Tang when the initial presentation was floating pulse and no sweat. Transmission from Taiyang to Taiyin (Spleen Earth) is Misguided Purging Transmission, caused by using purgatives instead of Guizhi Tang when the initial presentation was slow pulse and sweating, leading to abdominal pain and heavy limbs. Transmission from Taiyang to Shaoyin (Kidney Water) is Exterior-to-Interior Transmission, caused by urgent need for sweating but mistakenly using purgatives, preventing sweating and driving pathogens inward. Transmission from Taiyang to Jueyin (Liver Wood) is rare because Yin does not reach the head; only Jueyin ascends with the Du Mai to connect with Taiyang, termed "Following the Degree of Transmission."

Wu states: The six meridians in Shanghan involve Yin/Yang, Deficiency/Excess, Cold/Heat, all caused by exogenous pathogens. The *Neijing* states "Cold injury leads to heat," describing the norm, not variations. Zhang Zhongjing describes varying cold/heat to cover both norms and variations. Transmission of Yang pathogens is the norm; transmission of Yin pathogens is variation. Normative sequential transmission of Yang pathogens: Days 1-2 Taiyang, 2-3 Yangming, 3-4 Shaoyang, 4-5 Taiyin, 5-6 Shaoyin, 6-7 Jueyin. By day seven, the meridian cycle completes, and sweating should resolve the disease. If unresolved by day seven, it is "Re-transmission"; by fourteen days, it is "Over-passing the Meridian." Unresolved over-passing leads to "Bad Disease" (Huai Bing). Hua Tuo stated: Day 1 Skin, Day 2 Flesh, Day 3 Muscle, Day 4 Chest, Day 5 Abdomen, Day 6 Stomach, then interior. Treatment: Sweat for skin, harmonize for muscle, emetic for chest, purge for abdomen/interior. The *Shanghan Fu* states: Days 1-2 release exterior, 3-4 harmonize, 5-6 purge if solid. These are approximate rules for norms, not variations. Cold injury has no fixed pattern; it may strike Yin or Yang. Texts mention Day 1-2 fever with deep pulse as Shaoyin disease, or Day 1-2 clear mouth with back aversion to cold as Shaoyin disease. These are direct strikes to Yin meridians, variations not the norm. The *Huoren Shu* states: Cold entering from the back may strike Taiyang or Shaoyin; entering from the face may strike Yangming, etc., not exclusively Taiyang. Also, cold may stay in one meridian, skip meridians, transmit past one meridian without further transmission, transmit from foot to hand meridians due to heat, or change due to incorrect medication. Thus, texts say: Day 1 Taiyang, quiet pulse means no transmission; rapid/irritable pulse with vomiting desire means transmission. Days 2-3 absence of Yangming/Shaoyang symptoms means no transmission. Taiyang disease with floating/tight pulse, body pain, fever for 7-8 days unresolved still requires sweating. Shaoyin disease with dry mouth/throat on days 2-3 requires urgent purging with Dachengqi Tang. These do not rely solely on days. Shouzhen asked: "Who dares to purge with Dachengqi Tang on days 2-3?" The sages spoke generally. Taiyang is the head of meridians with frequent transmission. Heat pathogens transmit when deficiency exists; they do not transmit if the meridian is solid. Taiyang Water transmitting to Yangming Earth is "Wife transmitting to Husband" (Minor Evil). Yangming Earth transmitting to Shaoyang Wood is also "Wife to Husband" (Minor Evil). Shaoyang Wood transmitting to Taiyin Earth is "Husband transmitting to Wife" (Robbing Evil). Taiyin Earth transmitting to Shaoyin Water is also "Husband to Wife" (Robbing Evil). Shaoyin Water transmitting to Jueyin Wood is "Mother transmitting to Son" (Deficient Evil). Taiyang Water skipping to Shaoyang Wood is "Mother to Son" (Deficient Evil). Taiyang Water skipping to Taiyin Earth is Minor Evil/Misguided Purging. Taiyang Water transmitting to Shaoyin Water is Dual Yin-Yang Transmission (Liang Gan). Taiyang Water transmitting to Jueyin Wood is "Mother to Son" (Deficient Evil/Head-to-Tail Transmission). Transmission to Jueyin Liver is the tail ("Jue" means exhaustion). When righteous Qi recovers and pathogens resolve, Water rises, Fire descends, chills/fevers occur, and profuse sweating resolves the disease. If righteous Qi does not recover, pathogens cannot resolve; extreme Yin leads to cold limbs, curled tongue, deafness, scrotal retraction, unconsciousness, and death. Zhao states: Pathogens in Yang meridians are easier to treat; entering Yin meridians is critical. Yang is weak, Yin is strong; Righteous Qi is deficient, Pathogens are excess. Misguided purging/sweating leads to critical collapse. To treat Shanghan, one must study Zhang Zhongjing’s works to understand his principles; otherwise, confusion arises. Careful study reveals correct methods. Relying on fixed formulas without understanding principles leads to error. Xu stated: "Read Zhang Zhongjing’s books, use his methods, but do not rigidly stick to his formulas; this is truly understanding the ancients." Scholars should ponder every word. Tao stated: "Shanghan transmits only to foot meridians, not hand meridians" is a vulgar misconception. Qi converges at Danzhong at dawn, circulating through Hand-Taiyin Lung first, then distributing. If one meridian is discordant, all are affected. Why claim only foot meridians? Shanghan is winter cold injury. Winter governs Foot-Taiyang and Foot-Shaoyin. Spring governs Shaoyang and Jueyin, which are also affected because Wind-Wood begins at Dahan solar term (mid-12th lunar month) and warms after Chunfen, so Wind-Cold affects them. Foot-Yangming and Foot-Taiyin (Central Earth) are not specifically linked to winter but are affected. Zhu Xi stated: Earth has no fixed position/name/Qi, prospering in all four seasons, ending/beginning all things; thus, all seasonal temperatures affect it. Exterior pathogens transmitting inward return to Spleen/Stomach to form dry feces, treated with Chengqi Tang to harmonize Stomach Qi. Hand meridians govern Summer/Autumn and are less affected. Foot meridians are the primary realm of injury. Claiming "foot injured, not hand" allows claiming "transmits to foot, not hand," which is false. Wind-Cold enters Ying-Wei, circulating day and night everywhere, not stopping at hand meridians. Commentary: Shanghan origins are in the *Re Lun*. Why only foot meridians? Winter Shanghan starts at Foot-Taiyang Bladder and ends at Foot-Jueyin Liver. This disease mainly affects North/East directions and Earth positions associated with Foot-Yangming Stomach and Foot-Taiyin Spleen. Foot meridians are in the Northeast. Texts say: Winter cold manifesting immediately is Shanghan; Spring manifestation is Wenbing; Summer manifestation is Wenyi (most severe). Zhang Zhongjing said: "Without Extraordinary Vessels, there is no Shanghan," as extraordinary vessels attach to foot meridians, not hand, so cold injures only foot meridians. Long Summer is hot; Summer Fire is strong. Fire direction and Autumn Equinox are Hand meridians; Water direction and Spring Equinox are Foot meridians (deficient). When Summer Fire is strong, pathogens assist Hand meridians, making deficiency worse. Thus, medicines used drain excess, not tonify foot meridians. Draining excess tonifies deficiency. This is why Shanghan discusses foot meridians first. However, transmission to hand meridians does occur. *Cishi Nan Zhi* states: Shanghan days 5-6 may gradually cause confusion, muteness, or sleep-talking, red eyes, scorched lips, dry tongue, no thirst, swallowing porridge but refusing food, fine/rapid but not surging pulses, no epigastric fullness, no abdominal distension, normal bowels/bladder. After ten days, appearance resembles drunkenness. Doctors seeing confusion often purge with Chengqi Tang, which is wrong. They fail to recognize heat transmitting to Hand-Shaoyin Heart. Origin? Originally Taiyang Wind Strike. Wind is Yang pathogen, damaging Wei, drying Yin Blood. Heat accumulates in Bladder (Ren/Water), reverses to Bing/Fire (Small Intestine), siblings Bing/Ding, transmitting to Heart. Heart Fire steams Lung from above, causing confusion. Lung is pure/empty; internal fire causes confusion. Use Zhizi Huangqin Huanglian Tang. If pulse relates to Bing, use Daochi San; if relating to Heart, use Xiexin Tang. Lianpo San is Qi-moving/Blood-draining; use only if Left Cun pulse is deep/slipping/strong, or Xijiao Dihuang Tang. If no Xijiao, use Shengma (Yangming Blood-heat herb). If pulses are strong superficially and deeply, Bing/Ding both have heat; use half Daochi, half Xiexin. This case: Bladder transmits to Bing, Foot to Hand, Downward, Bing to Ding, Exterior to Interior, Ren (Kan/Water) to Ding (Li/Fire), Skipping Transmission, Fu to Zang. *Huoren* says "Shanghan transmits foot not hand" is incomplete. Transmission from foot to hand exists. How to know? Texts say: Shanghan may stay in one meridian, skip one or two, not bound by start Taiyang/end Jueyin. Treat based on pulse and signs.