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The origin of diseases can be summarized in four characters: "internal injury" (Nei Shang) and "external contraction" (Wai Gan). The nature of diseases can be encompassed by eight characters: "cold" (Han), "heat" (Re), "deficiency" (Xu), "excess" (Shi), "exterior" (Biao), "interior" (Li), "yin" (Yin), and "yang" (Yang). Regarding the methods of treatment, they are fully covered by the Eight Methods: "diaphoresis" (Han), "harmonization" (He), "purging" (Xia), "elimination" (Xiao), "emesis" (Tu), "clearing" (Qing), "warming" (Wen), and "tonification" (Bu). Indeed, within one method, all eight methods are contained; within the eight methods, a hundred methods are contained. Although pathological changes are numerous, the principles converge into one. These are experiences I have deeply understood and verified without error over decades, fully presented in these eight chapters. If students study them diligently and reflect profoundly, they may offer some assistance in saving the people.

"Diaphoresis" refers to dispersion. The Classics state: "When pathogenic factors are in the skin and hair, disperse them through sweating." It also states: "If the body is hot as burning charcoal, it will cool down after sweating." However, errors occur when diaphoresis is indicated but not performed, when it is not indicated but performed, when it is indicated yet contraindicated but wrongly applied, when it is indicated yet contraindicated but necessary, and when the method is incorrect. There are cases where diaphoresis does not target the correct meridian, drugs are not distinguished, and only dispersion is known without restraint, leading to harm. These situations require careful scrutiny.

Why? When wind-cold initially invades the human body, symptoms include headache, fever, aversion to cold, nasal congestion, heavy voice, and body pain. This indicates disease in the skin and hair, and diaphoresis is indicated. If missed or improperly performed, pores close, Ying and Wei Qi (Nutritive and Defensive Qi) become blocked, and pathogens deepen into meridians. In such cases, although headache and fever resemble Taiyang Cold Damage (Taiyang Shang Han), if the patient is fatigued, weak, with no nasal congestion, normal voice, and a weak pulse, it indicates internal injury with insufficient Yuan Qi (Original Qi). Other conditions include true yin deficiency from mental strain or sexual excess, presenting with internal heat, afternoon fever (Pu Re), and a fine, rapid, weak pulse; food stagnation causing chest fullness, acid regurgitation, belching of rotten smells, afternoon tidal fever, and a tight pulse at the Qi Kou position; cold phlegm with厥逆 (Jue Ni, reversal cold); dampness causing Hong Kong Jiao (Hong Xiang Jiao, gouty arthritis); internal and external abscesses; blood stasis; wind-warmth, damp-warmth, and summerheat with spontaneous sweating. All present with chills and fever resembling external wind-cold but are fundamentally different. Misapplying diaphoresis leads to myriad complications. This is "diaphoresis when not indicated."

For exterior patterns requiring diaphoresis, if there is "moving qi" (Dong Qi) around the navel, diaphoresis is contraindicated. The Classics state: "Moving qi on the right: do not sweat; sweating causes epistaxis, thirst, irritability, and vomiting upon drinking." "Moving qi on the left: do not sweat; sweating causes dizziness, continuous sweating, and muscle twitching." "Moving qi above: do not sweat; sweating causes qi rushing upward to the heart." "Moving qi below: do not sweat; sweating causes anhidrosis, severe cardiac irritability, bone joint pain, vertigo, vomiting upon eating, and tongue stiffness." Additionally, deep pulse with dry throat indicates interior disease; sweating depletes fluids, causing constipation and delirium. Shaoyin syndrome with cold limbs and no sweat should not be forcibly sweated, as this disturbs blood, potentially causing bleeding from ears, eyes, mouth, or nose, termed "lower jue and upper exhaustion," which is difficult to treat. Shaoyin cold damage cannot be sweated, as it worsens cold limbs and curling up. Weak cun pulse indicates yang deficiency; sweating causes yang collapse. Weak chi pulse indicates yin deficiency; sweating causes yin collapse. Patients with blood loss, chronic strangury, or sores must not be sweated, as it causes staring eyes, sunken forehead arteries, hematochezia, or spasms. Shaoyang syndrome cannot be sweated, causing delirium. Complicated cases, deficient patients, and women during menstruation must not be sweated, lest complications arise. This is "indicated for diaphoresis but contraindicated, wrongly applied."

If diaphoresis is contraindicated yet necessary, how to proceed? There are methods. The *Shang Han Fu* states: "For moving qi, use Lizhong Tang removing Atractylodes." This protects yuan qi while dispelling pathogens. For heat entering the interior with unresolved exterior, Zhang Zhongjing used Ma Huang Shi Gao (Ephedra and Gypsum Decoction) or Ge Gen Huang Lian Huang Qin (Kudzu, Coptis, and Scutellaria Decoction), representing cooling exterior resolution. For Taiyang pattern with deep/thin pulse and Shaoyin pattern with fever, Ma Huang Fu Zi Xi Xin (Ephedra, Prepared Aconite, and Asarum Decoction) warms the interior and resolves the exterior. For Shaoyang wind-stroke, Chai Hu Tang (Bupleurum Decoction) plus Gui Zhi (Cinnamon Twig) harmonizes and resolves the exterior. Li Dongyuan used Buzhong Yiqi Tang (Tonify the Middle and Augment the Qi Decoction) plus exterior-resolving herbs for yang deficiency; Zhu Danxi used Xiong Gui Tang (Szechwan Lovage and Angelica Decoction) plus exterior-resolving herbs for yin deficiency. These methods are precise. Generally, yang deficiency requires tonifying the middle to induce sweat; yin deficiency requires nourishing yin to induce sweat; heat requires cooling to induce sweat; cold requires warming meridians to induce sweat; food stagnation requires guiding digestion to induce sweat. Heavy exterior invasion with strong constitution warrants heavy diaphoresis (Ma Huang Tang); light invasion with weak constitution warrants light diaphoresis (Xiang Su San). Southeast regions differ from the Northwest; winter blooms, less frost/snow, weaker constitutions, and loose pores require mild diaphoresis. I treated early Shang Han with Xiang Su San plus Jing Jie, Fang Feng, Chuan Xiong, Qin Jiao, and Man Jing Zi, often curing in one dose. Ma Huang, a harsh agent, was rarely used. Regional differences dictate drug choices. For mixed patterns (yin/yang deficiency, cold/heat, food stagnation), apply previous methods flexibly, learning from ancient intent rather than rigidly following formulas. These proven methods are shared to save lives.

Diseases of the Three Yang meridians vary in depth and require sequential treatment. Treating Taiyang with Yangming-dispersing herbs misses the mark. Harmonizing Shaoyang for Taiyang/Yangming disease invites pathogens inward. Treating one meridian when two are affected leaves one untreated; treating one when three are affected leaves two untreated. Treating multiple meridians when only one is affected allows pathogens to spread. For Taiyang anhidrosis, Ma Huang is best; for Taiyang hyperhidrosis, Gui Zhi is first. Ge Gen targets Yangming; Chai Hu targets Shaoyang. These are reliable. Jiu Wei Qiang Huo Tang treats simultaneous cold-heat in Three Yin and Three Yang, not just Taiyang. Chai Ge Jie Ji Tang treats spring warmth/summer heat, resolving from interior to exterior, for non-chilly, thirsty patterns. It is unsuitable for new wind-cold with chills and no thirst. Gui Zhi Tang treats wind-cold with spontaneous sweating but is contraindicated for summerheat-induced sweating; misuse exacerbates heat. Sweating summerheat damages fluids, causing "Chong Ye" (Heavy Summerheat), often fatal. Ancient masters used Bai Zhu/Fang Feng for wind and Yi Yuan San/Xiang Ru Yin for summerheat to avoid Three Yang taboos.

People know diaphoresis reduces fever but not "restraining sweat" to reduce fever. No sweat requires dispersion; excessive sweat requires restraint. "Restraint" does not mean merely using sour astringents like Wu Wei Zi or Suan Zao Ren. It means addressing the cause of sweating appropriately so sweat stops naturally. Wind damaging Wei Qi causes spontaneous sweating; Gui Zhi Tang harmonizes Ying and Wei, dispels wind, and stops sweat. Heat entering the interior causes sweating via steaming, like boiling water; this is excess, not deficiency. Use Bai Hu Tang (White Tiger Decoction) to clear heat. If pathogens are bound with constipation, use Cheng Qi Tang (Order the Qi Decoction) to purge; heat subsides, sweat stops. Similar to summerheat sweating, but summerheat damages Qi (deficient evil), requiring clearing and tonifying. Cold damages Form (excess evil), allowing purging to stop sweat. Excessive diaphoresis causing yang collapse with tremors requires Zhen Wu Tang (True Warrior Decoction), a rescue remedy distinct from cold-damp sweating or heat-pattern sweating. Shaoyang patterns with slight head sweat or night sweats use Xiao Chai Hu Tang. Water retention with head sweat uses Xiao Ban Xia Jia Fu Ling Tang (Minor Pinellia Plus Poria Decoction). Deficient patients with spontaneous/night sweats use Gui Pi Tang, Buzhong Yiqi Tang, Ba Zhen Tang, or Shi Quan Da Bu Tang. Flexibility in application yields results. This is "targeting the correct meridian, using appropriate drugs, knowing both dispersion and restraint." Alas! Hundred diseases originate from wind-cold invading the exterior. Proper diaphoresis cures all; errors lead to premature death. How difficult is the Diaphoretic Method!