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1. A pulse that is deep, fine, and powerless indicates direct invasion of cold (Zhi Zhong Han). 2. Aversion to cold in the back indicates direct invasion of cold. 3. Vomiting clear saliva indicates direct invasion of cold. 4. Cold extremities extending beyond the elbows and knees indicate direct invasion of cold. 5. Excessive sleepiness indicates direct invasion of cold. 6. Dry retching without thirst indicates direct invasion of cold. 7. Continuous abdominal pain with diarrhea containing undigested food indicates direct invasion of cold. 8. Vomiting roundworms indicates direct invasion of cold. 9. Curling up while lying down indicates direct invasion of cold. 10. Contraction of the scrotum and cyanosis of the lips and nails indicate direct invasion of cold. 11. Aversion to cold with body pain, but without headache or fever, indicates direct invasion of cold. 12. Spasm and stiffness of the four limbs without fever indicates direct invasion of cold. 13. Body pain as if beaten by a club indicates direct invasion of cold. 14. Clear and profuse urination indicates direct invasion of cold. If any one of the above symptoms appears, it can be known as direct invasion; warming methods should be applied urgently.

1. If there are exterior syndrome manifestations such as headache and fever, accompanied by diarrhea with undigested food, this indicates interior cold, belonging to the category of simultaneous exterior and interior cold syndromes. 2. Severe abdominal pain with extreme thirst indicates an interior syndrome; or if the pulse is floating, indicating an exterior syndrome, this also belongs to simultaneous exterior and interior heat syndromes. 3. Constipation belongs to interior syndrome; if accompanied by slight aversion to cold, this means the exterior pathogen has not yet resolved, which also belongs to simultaneous exterior and interior heat syndromes. For transmitted diseases presenting simultaneous exterior and interior conditions, if they are heat or excess syndromes, treatment should primarily focus on resolving the exterior, with attacking the interior as secondary. If the interior syndrome is urgent, flexible methods must be used. For direct invasion presenting simultaneous exterior and interior conditions, if they are cold or deficiency syndromes, treatment should primarily focus on saving the interior, with resolving the exterior as secondary. This is the general principle for treating simultaneous exterior and interior syndromes.

Question: Why is a floating pulse considered an exterior syndrome? Answer: A floating pulse refers to the pulse being felt at the superficial level of the flesh; pressing heavily reveals insufficient strength, like wood floating on water. The classics state: "A floating pulse at the Cun Kou position indicates disease in the exterior." The exterior refers to the outside of the body. If the pathogen were in the interior, the pulse would necessarily be deep and fine; how could it be floating? Therefore, upon seeing a floating pulse, it undoubtedly belongs to an exterior syndrome. It is also said: "A floating pulse belongs to the exterior." What if there is an interior syndrome but the pulse remains floating? How should it be treated? Answer: In cases of interior syndrome with a floating pulse, the exterior pathogen has not yet resolved. One must first resolve the exterior before attacking the interior. Zhang Zhongjing stated: "If the exterior is not resolved, do not attack the interior." The Taiyin Chapter states: "For abdominal pain with a still-floating pulse, use Guizhi Jia Dahuang Tang (Cinnamon Twig plus Rhubarb Decoction)." For Jie Xiong syndrome (Phlegm-Fluid accumulation in the chest) where all symptoms are present but the pulse is floating, purgation is contraindicated. This shows that although interior syndromes generally warrant purgation, when the pulse is floating, one dares not attack. If the exterior syndrome has ceased, and constipation with delirium occurs, even if the pulse is floating, one should adopt a flexible approach and purge. This is prioritizing symptoms over the pulse.

Question: Why is body pain considered an exterior syndrome? Answer: Cold damages Ying blood (Nutritive Blood); when pathogens invade the human body, they enter through the skin, hair, muscles, and flesh. Now that the pathogen resides in the skin and muscles, blood vessels become stagnant and blocked, causing body pain. If heat were in the muscles, the blood vessels and Ying-Wei Qi (Defensive Qi) would circulate freely throughout the body and limbs; how could there be body pain? The Neijing discusses cough: "Frequent exposure to cold leads to mild coughing, but severe cases lead to pain or diarrhea." The Zhenjing states: "Severe cold causes pain; severe heat causes muscle wasting and ulceration." The Neijing attributes various pains mostly to cold, never to heat. From this argument, it is clear that pain is due to cold. Thus, whenever body pain is seen, it undoubtedly belongs to an exterior syndrome. One should use acrid-dispersing herbs to promote the flow of Qi and blood, after which the pain will cease. It is also asked: Since body pain is an exterior syndrome, why does it also occur in interior syndromes? Answer: Body pain in interior syndromes results from direct invasion into the interior, not from transmitted interior syndromes. Transmitted interior syndromes belong to heat. Heat tends to circulate freely; thus, how could there be body pain? As for body pain caused by direct invasion, it is because cold qi invades the zang-fu organs, Yang Qi is already weak and critical, and Qi and blood stagnate, causing body pain. One should urgently warm the interior. How to distinguish them? Headache with fever and pain feeling like being bound by a rope indicates an exterior syndrome. No headache or fever, but pain feeling like being beaten by a club, indicates direct invasion. Someone asks: Sunyang exterior syndromes also have body pain; why use Sini Tang (Four Reversal Decoction) instead of Mahuang Tang (Ephedra Decoction)? Answer: If all exterior symptoms are present, the pulse should be floating and tight. If it is instead deep, slow, and powerless, it indicates cold invasion. Therefore, Mahuang Tang cannot be given; instead, Sini Tang is used because the disease involves the exterior but has deficiency-cold, so the pulse cannot be floating and tight. Sini Tang warms the interior. This is entering the Taiyang channel, but the pulse resembles Shaoyin disease. If it falsely presents as a floating-tight pulse, it truly belongs to a Taiyang exterior syndrome; who would dare use Sini Tang then! This case prioritizes the pulse over symptoms.

Question: Why is fever considered an exterior syndrome? Answer: Cold stagnating in the Cou Li (pores and interstices) causes blockage and fever. The heat feels warm and scalding to the touch; this heat is only on the skin surface, with no heat inside, named "Exterior Disease with Interior Harmony." The Neijing discusses various syndromes: when wind-cold invades, it causes hair to stand erect, skin pores to close, leading to fever and sweating. It also says: "The body is hot as burning charcoal; sweating resolves it." The Treatise on Heat Diseases states: "When humans are injured by cold, it becomes a heat disease. If heavy sweating occurs, the heat resolves." From this, it is evident that fever belongs to the exterior. It is also asked: Fever certainly belongs to the exterior. What if fever is accompanied by constipation, and the interior syndrome is urgent? Should treatment follow the exterior or the interior? Answer: If the interior is urgent, one should adopt a flexible approach and purge, but one must not abandon exterior-resolving herbs. Why? Take Sanhuang Shigao Tang (Three Yellows and Gypsum Decoction) as an example. Its formula includes Huanglian, Huangqin, Huangbai, Zhizi, Mahuang, Danshi, Shengjiang, Dazao, and Xicha. It is decocted hot and taken cold to disperse excessive heat in the exterior, interior, and San Jiao. This decoction treats mania, thirst, and fever. The inclusion of Mahuang is specifically for fever. This shows that even if the interior syndrome is urgent, one dares not use purely cold-natured herbs; acrid-dispersing herbs are added. How much more so for ordinary fever, which is not considered an exterior syndrome? Another question: All fevers occur in Yang channels, not Yin channels. Zhang Zhongjing says: "Shaoyin fever uses Ma Huang Fu Zi Xi Xin Tang." What is the explanation? Answer: Shaoyin fever indicates both exterior and interior injury. Aversion to cold is due to direct invasion, not a transmitted Shaoyin disease. Although named direct invasion, the presence of fever means it cannot be classified solely as direct invasion. Hence, Ma Huang Fu Zi Xi Xin Tang is used to resolve both exterior and interior, preventing the pathogen from staying. If it were a transmitted Shaoyin disease, there would be aversion to cold without fever. However, what if exterior heat advances into Shaoyin creating a distinct heat syndrome? Generally, Shaoyin fever may have a deep, slow, tight, or choppy pulse, with no external headache, or with diarrhea of undigested food and cold extremities—these are Shaoyin signs. But for Taiyang disease, if this syndrome includes headache, it is simultaneous exterior and interior, representing Liang Gan (simultaneous contraction of cold and heat). How can it be called Shaoyin heat? In summary, when interior syndromes are severe and urgent with external fever, purgative herbs are added with Mahuang; for Shaoyin fever, warming herbs are added with Xi Xin. This shows heat belongs to exterior syndromes. Zhang Zhongjing also said: "There is no fever in the Three Yin channels," referring to transmitted diseases.

Question: Why does headache belong to the exterior? Answer: The Three Yang channels ascend to the head. Only the Taiyang channel is the longest, accounting for most headaches. All Three Yang channels have headaches; their syndromes are distinguished separately. Thus, seeing a headache immediately indicates an exterior syndrome. It is also said: "The Three Yin channels have no headaches." Why does Jueyin have headaches? Answer: The Three Yin channels return at the neck; how can they cause headaches? Only the Jueyin channel meets the Du Mai (Governing Vessel) at the vertex, gathering all Yang channels, hence causing headaches. However, Jueyin headaches are uncommon. They must be accompanied by vomiting of saliva and phlegm, with no internal heat signs, indicating direct invasion, requiring warming. If Shanghan transmits to Jueyin and headache occurs, a floating pulse indicates recovery is imminent. If not recovered, Xiao Jianzhong Tang (Minor Construct the Middle Decoction) is used.

Question: Why is aversion to cold considered an exterior syndrome? Answer: The exterior of the human body is Yang and the exterior. Cold is a Yin pathogen. Now, the exterior is deficient and attacked by cold, named "Yin Excess and Yang Deficiency." Yang cannot warm the skin and Wei Qi externally, leaving it empty. Even sitting in a sealed room, one pulls clothes to cover oneself, called aversion to cold. Zhang Zhongjing said: "Yin excess and Yang deficiency are cured by sweating." Thus, aversion to cold belongs to the exterior. False heat on the skin causes nakedness and irritability, called aversion to heat; how could it be aversion to cold? Upon seeing aversion to cold, one knows cold is in the skin and muscles; promptly administering sweet and acrid agents is appropriate. It is also asked: Why do interior syndromes also have aversion to cold? Answer: Aversion to cold in interior syndromes is due to direct invasion, not transmitted interior syndromes. Transmitted syndromes have heat entering the Fu organs, inevitably causing aversion to heat, not aversion to cold. Direct invasion aversion to cold is due to extreme cold qi and weak Yang failing to warm, causing cold extremities and aversion to cold. How to distinguish? Direct invasion aversion to cold lacks headache and fever. The classics say: "Fever with aversion to cold arises from Yang; no fever with aversion to cold arises from Yin." Another question: Aversion to cold certainly belongs to the exterior. What if a transmitted interior syndrome, though severe and urgent, has slight aversion to cold? How to treat? Slight aversion to cold means the exterior pathogen has not resolved; one must first resolve the exterior, then attack the interior after resolution. If the interior is urgent, adopt a flexible purging approach. This is a flexible method. It is also said: Suppose mistaken purging leads to Jie Xiong (Phlegm-Fluid accumulation), with pathogen in the chest causing pain, severe urgency, and slight aversion to cold. How to treat? Answer: Jie Xiong is formed by mistaken purging. The current aversion to cold means the pathogen has not resolved and is knotting in the chest. One must first resolve the exterior before administering Xianxiong medicines. If one attacks again, the exterior pathogen will knot in the chest, making it incurable. Thus, if there is the slightest aversion to cold in Jie Xiong, one must not attack. This shows aversion to cold belongs to the exterior.

Question: Why are normal eyes and tongue considered exterior syndromes? Answer: The eyes are connected to the essence of the five Zang organs. The tongue reflects internal changes due to cold and heat. If the Zang-fu have heat, the eyes will be yellow and red, and the tongue dry, yellow, and black. Now, since the eyes and tongue are normal, we know the pathogen has not entered the Zang-fu. It is an exterior disease with interior harmony, undoubtedly belonging to the exterior.

Question: How do we know stiff neck and spine indicate an exterior syndrome? Answer: The Taiyang channel begins at the inner canthus, ascends to the forehead corner, descends from the vertex, enters the neck, goes to the shoulders, and reaches the little toe. These are all locations of the Taiyang meridians. When pathogens lodge on the back spine moving up and down along the paravertebral muscles, stiff neck and spine result, belonging to Taiyang exterior syndromes. Other channels follow their own paths; how could they cause stiff neck and spine? Since stiff neck belongs to Taiyang and the exterior, it should be treated with sweating. Yet, it is said that stiff neck in Jie Xiong requires purging. Why? Answer: Stiff neck in Jie Xiong is not true stiff neck. Mistaken purging causes exterior pathogens to enter the chest. The chest is near the neck; pathogen knotting in the Upper Jiao presses against the neck, blocking Qi circulation. The head cannot bend forward; bending causes chest pain, danger looming. Thus, stiff neck with swelling and pain in Jie Xiong requires urgent purging; it is not Taiyang channel stiff neck. How to distinguish? In Taiyang channel syndromes, the patient can nod and lift the head freely; nodding does not cause chest pain—this is Taiyang stiff neck. If purging has already occurred, and nodding causes chest pain, it is Jie Xiong stiff neck.

Question: Why is panting considered an exterior syndrome? Answer: The Lung governs the skin and hair. External cold pathogens enter from the skin and hair. The Lung has seven lobes, sharing similar Qi with the exterior. When the exterior is affected by cold, constriction affects the Lung, preventing Qi from ascending and descending, causing panting. In Mahuang Tang, Xingren (Apricot Seed) is used for the Metal element of the Lung, and Mahuang removes cold from the skin and hair. Skin/hair and Lung share connected Qi; thus, panting belongs to exterior syndromes. Even in chronic panting, Mahuang and Xingren are used; how much more so in acute cases? It is also said: Panting belongs to the Lung and the exterior. The Zhizhang states: "Panting and fullness without aversion to cold should be purged to heal." Why? It is also said: Some transmitted interior syndromes cause panting due to constipation blocking turbid Qi. This panting does not originate from the Lung, so it should be purged. One must observe external signs; if there is even a trace of exterior syndrome with panting, do not treat as interior syndrome. Mistaking it for interior syndrome and purging leads to adverse reactions. Zhang Zhongjing said: "Patients with chronic panting without interior signs should receive Xingzi Tang." This statement is very clear.

Question: Why does cough belong to the exterior? Answer: The Lung is the canopy of the five Zang organs, shaped like an inverted cauldron. When cold pathogens lodge there, the lung leaves contract and cannot expand, causing Qi to rush upward. The classics say: "Frequent exposure to cold leads to cough." Thus, cough belongs to the exterior. Is there cough in interior syndromes? Answer: Cough in interior syndromes belongs to direct invasion, not transmission. Direct invasion cough is caused by cold urgently binding the Lung, resulting in cough, diarrhea of undigested food, and cold extremities, with no exterior signs as distinguishing features. If accompanied by exterior signs, it is not direct invasion cough. Transmitted cough is incorrect. Transmitted syndromes belong to heat; heat flows freely, and Qi moves rapidly; how could there be cough? People say cough belongs to Fire. Why? Answer: Cough belonging to Fire refers to miscellaneous diseases. Diseases have deficiency-fire and excess-fire. Fire flares upward, causing cough. Or, initial cold infection transforms into heat after prolonged coughing, also becoming fire-cough. Both are chronic diseases. With no internal or external cold signs, only cough exists, distinguishing new from old: New cases are Wind-Cold or Cold Damage; old cases are deficiency-fire or excess-fire. Wind-cold is dispersed; deficiency-fire is treated according to its nature; excess-fire is cleared with cooling. These are called contrary treatment and following treatment, applicable to miscellaneous disease coughs. For Shanghan, cough is either exterior or direct invasion; transmitted cough absolutely does not exist.

Question: Why are spastic limbs considered an exterior syndrome? Answer: Cold invading the skin and hair causes spasms. The classics say: "Much cold causes tendon and bone cramping; severe heat causes flaccid tendons and relaxed muscles." Thus, limb spasms undoubtedly belong to the exterior. Why do Yin channels often show spasms? Answer: This is direct invasion of Yin channels. How to distinguish cold-induced spasms? Fever with headache indicates an exterior syndrome; absence of fever and headache indicates direct invasion. After sweating, vomiting, or purging, limb spasms indicate exhaustion of body fluids and blood failing to nourish tendons and bones; Zhenwu Tang (True Warrior Decoction) is suitable.

Question: Why do non-thirsty mouth and normal urination/defecation indicate an exterior syndrome? Answer: Skin and muscles are the exterior; bones, sinews, Zang, and Fu are the interior. When pathogens are in the exterior, the interior is harmonious: no thirst, normal bowel and bladder functions. If interior heat scorches the Zang-fu, there will be thirst, constipation, or dysentery, with short, dark urine, violating normalcy.

Question: Why is an imperceptible pulse considered an exterior disease? Answer: The pulse is the residence of blood. Heat promotes blood flow; how could the pulse be hidden? Only when exterior cold is deeply contracted does the pulse become concealed. What about hidden pulses in interior syndromes? Answer: Hidden pulses in interior syndromes occur only in direct invasion, where extreme cold causes stagnation. Sini Tang plus Pig Bile is used. Transmitted interior syndromes belong to heat; heat promotes blood flow, so how can the pulse be hidden? In Yang reversal with extreme heat, the pulse may also be hidden. How to explain? Extreme heat hiding the pulse is rare. Externally, major heat signs may appear; though the pulse is hidden, the fingers feel warm. Or, there is a painful area; extreme pain causes the pulse to hide. Ordinary hidden pulses are either exterior syndromes or direct invasion. All above are exterior syndromes and should be released via the exterior.

Question: How do long pulses at Cun and Chi indicate pathogen in the muscles? Answer: Long pulses overflow beyond their normal position. Yangming is a channel abundant in Qi and blood. Once the pathogen transmits here, it steams the skin and muscles, causing Qi and blood to surge, resulting in long pulses in both Yin and Yang positions. Acrid-cool exterior-resolving methods should be used; acrid-sweet exterior-releasing drugs are contraindicated. Some say: Long pulses mean the pathogen lodges in Yangming muscles; why use Chengqi Decoctions? Answer: Those using Chengqi Decoctions treat Yangming Fu organ diseases, not Jing channel diseases. Yangming Fu diseases require purging; the pulse is long,洪 (surging), and forceful, accompanied by constipation and delirium, justifying Chengqi use. If Yangming Jing channel disease, the pulse is long and floating, indicating exterior disease with interior harmony; who would dare use Chengqi? It is also said: Yangming diseases should not be purged, yet Yangming requires urgent purging. Physicians are confused. Zhang Zhongjing's methods are misunderstood by shallow scholars. Wang Shuhe compiled the Six Channels, failing to distinguish Jing/Fu in Yang channels and Transmission/Direct Invasion in Yin channels. Zhang Zhongjing purges Yangming Fu, not Jing; he releases Yangming Jing, not Fu. How can one confuse Jing with Fu?

Question: Why do eye pain and dry nose indicate pathogen in the muscles? Answer: The eyes are located in the meridians of the Yangming Stomach Fu. The Stomach governs muscles. Pathogens enter from skin/hair into muscles. Eye pain and dry nose indicate pathogen in Yangming muscles. Other channels follow their own paths; why these signs?

Question: Rinsing water without swallowing, what indicates pathogen in the muscles? Answer: Lips are the root of muscles. Cracked lips desiring to rinse water indicate pathogen in muscles. Why not swallow? Heat pathogen is only in muscles; Zang-fu have no heat. Rinsing merely moistens lips, hence no desire to swallow. This is exterior disease with interior harmony. If exterior signs resolve and it becomes an interior syndrome, rinsing without swallowing occurs. Should treatment follow exterior or interior? Answer: Without exterior signs, interior must have heat. Heat consumes water; rinsing should involve swallowing. If not swallowed, it indicates intra-abdominal blood stasis. How to identify? No exterior signs; hard/full lower abdomen, free urination, and dry black stools confirm it. Tao Ren Chengqi Tang (Peach Kernel and Da Huang Decoction) should be used to purge. All above indicate pathogen in muscles; muscle-resolving methods are needed.

Question: Why is a pulse neither floating nor deep considered a half-exterior half-interior syndrome? Answer: Floating is exterior; deep is interior. Neither floating nor deep means exterior pathogen is about to enter the Fu, so the pulse is not floating; interior pathogen has not yet entered the Zang, so the pulse is not deep. Neither exterior nor interior, knowing the pathogen is in the middle. Undoubtedly half-exterior half-interior.

Question: Why is vomiting considered half-exterior half-interior? Answer: Pathogen is about to enter the interior; interior Qi rushes upward; pathogen and healthy Qi struggle. Though originating from the Stomach, it originally belongs to Shaoyang location. Gallbladder is a pure and clear Fu, tolerating nothing. Pathogen interference causes vomiting, belonging to half-exterior half-interior. There are also Stomach Heat and Stomach Cold distinctions, differentiated by thirst or lack thereof.

Question: Why is chest fullness considered half-exterior half-interior? Answer: Upper body is Yang; lower body is Yin. Chest is the realm of clear Yang, situated between half-exterior and half-interior. Pathogen arrives here, about to enter interior but not deeply. Chest fullness without abdominal fullness means pathogen is无形 (formless); thus chest fullness is between half-exterior and half-interior. Abdominal fullness implies有形 (form) and not just pathogen. Pi Syndrome (Glomus) also causes chest fullness. How to distinguish? Pi Syndrome results from mistaken purging of exterior pathogen causing chest distension. Ask if purging was performed. If yes, it is Pi Syndrome. If not purged and chest is full, it is half-exterior half-interior syndrome.

Question: Why is deafness considered half-exterior half-interior? Answer: Foot-Shaoyang Gallbladder channel connects to the ear. Deafness indicates half-exterior half-interior.

Question: Why is hypochondriac pain considered half-exterior half-interior? Answer: Foot-Shaoyang Gallbladder channel distributes to the hypochondrium. Hypochondriac pain is therefore half-exterior half-interior. Other channels emerge from vertex/back or distribute to face/eyes; how could they cause hypochondriac pain? Some say: Water-Qi also causes hypochondriac pain. Answer: Water-Qi must present with dry retching, heart fullness, cough pulling hypochondriac pain, and head sweating...