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Warm-heat diseases refer to illnesses caused by contracting warm pathogens or heat pathogens of the seasonal climate, typically occurring in the third, fourth, fifth, and sixth lunar months. The lay public, lacking understanding, generally categorizes all external contraction diseases in spring, summer, and autumn as Cold Damage (Shanghan), and frequently applies the methods of releasing the exterior and warming the interior from the works of Zhang Zhongjing and Tao Jie'an, leading to misdiagnosis and death. It is necessary to clarify this distinction. Herein, the symptoms, pulses, and disease names of seasonal external contractions are detailed one by one to prevent therapeutic errors.

Cold Damage (Shanghan) occurs after the Major Snow solar term, during the final phase of the six qi cycles, when Foot Taiyang Cold Water governs. The weather is freezing and severe; if one is exposed to cold pathogens, symptoms such as headache, fever, aversion to cold, body pain, lower back pain, stiffness of the spine, absence of sweating, and a floating and tight pulse appear. This indicates that cold pathogens have injured the Ying (Nutrient) level of the Taiyang channel, hence termed Cold Damage, treated primarily with Mahuang Tang (Ephedra Decoction). If symptoms include headache, fever, aversion to wind, spontaneous sweating, and a floating and slow pulse, this indicates wind pathogens injuring the Wei (Defensive) level of the Taiyang channel, termed Wind Injury, treated primarily with Guizhi Tang (Cinnamon Twig Decoction). If symptoms include headache, fever, aversion to cold, body pain, lower back pain, spinal stiffness, absence of sweating, irritability, and a floating and tight pulse, this indicates simultaneous injury to both Ying and Wei by wind and cold, treated primarily with Da Qinglong Tang (Major Green Dragon Decoction). These three conditions are collectively categorized under Cold Damage, and treatment should follow the methods in the books of these two masters (Zhang Zhongjing and Tao Jie'an). Works such as Yu Jiayan's *Shanglun Pian* (Discussion on Ancient Treatises), Tao Jie'an's *Jiami Bencao* (Secret Essentials of Home Formulas), and *Shache Chui Fa* (Methods for Breaking the Wheelbarrow) should be studied deeply.

After the Beginning of Spring, it is the first phase, governed by Jueyin Wind Wood. If early spring cold air persists despite the season, presenting the aforementioned Taiyang symptoms, it remains Cold Damage. It is appropriate to use small doses of the aforementioned formulas to release the exterior, or treat with modified Jiawei Qianghuo Tang (Nine-Ingredient Notopterygium Decoction). If the weather is warm, and one contracts illness from mild warm winds, it is termed Wind-Warmth Syndrome. Symptoms include alternating chills and fever, headache, aversion to wind, bitter taste in the mouth, dry throat, vertigo, deafness, pain in the chest, hypochondrium, ribs, and thighs preventing turning over, nausea, vomiting, epigastric pain at the heart region, spontaneous sweating, and a wiry pulse. This indicates pathogenic factors in the Foot Shaoyang channel. Treatment should employ light, acrid-cool dispersing methods, using modified Xiaochaihu Tang (Minor Bupleurum Decoction) internally with sweet-cool harmonizing agents. This differs significantly from Wind-Warmth arising from winter wind invasion where the pathogen lies dormant and erupts in spring warmth. One must carefully distinguish whether the early spring climate is cold, warm, or hot, and treat accordingly.

After Clear Brightness (Qingming), it is the second phase, governed by Shaoyin Sovereign Fire. Contracting warm winds affects the Hand Jueyin Pericardium, which acts on behalf of the Heart Monarch, as the Heart itself does not accept pathogens due to its sovereign status. Symptoms include headache (or no headache), but mainly body heat. Initially, there may be slight aversion to cold and absence of sweating, palpitations, irritability, or rashes. The left hand pulse is surging and full. This is an illness caused by seasonal warm pathogens, named Warm Disease (Wenbing). It differs from Warm Disease caused by winter cold lying dormant until spring eruption. Treatment involves Chaihu Danpi Tang (Bupleurum and Moutan Decoction), decocted and taken with induced vomiting to induce slight sweating and resolve the exterior, following the principle of "releasing fire stagnation."

After Grain in Ear (Mangzhong), it is the third phase, governed by Hand Shaoyang Ministerial Fire. Contracting heat pathogens affects the Sanjiao (Triple Burner) meridians. Symptoms include headache, fever, aversion to wind, spontaneous sweating, pain connecting the outer canthus to behind the ear, tinnitus, deafness, vertigo, sore throat, pain along the lateral aspects of the shoulders, elbows, and arms, irritability, or macules. The right hand pulse is surging and full. This is an illness caused by seasonal heat pathogens, named Heat Disease (Rebing). Treatment involves Chaihu Danpi Tang, with induced vomiting to resolve the exterior. Generally, warm-heat external contractions affect the Hand meridians rather than the Foot meridians. If transmission occurs, treatment should follow the specific symptoms of the affected Hand or Foot meridians. This constitutes the general outline for treating warm-heat diseases.

However, during Great Heat and Minor Heat, there is the syndrome of Summerheat Stroke. As stated in *Jingui Yaolue*: "Taiyang Summerheat is called Re (Heatstroke)." Symptoms include sweating, aversion to cold, body heat, and thirst. The pulse must be deficient. Ren Shen Baizhu Tang (Ginseng and White Tiger Decoction) should be used (see Summerheat section).

After Beginning of Autumn, it is the fourth phase, governed by Taiyin Damp Earth. However, Damp Earth thrives at the end of each season, making Dampness diseases most common in Late Summer. If the whole body aches with fever and the skin has a smoky yellow hue, this is the "Dampness Patient" syndrome described in *Jingui Yaolue*. Treatment requires Qianghuo Siling San (Notopterygium and Four-Ingredient Poria Powder) added with Yinchen (Artemisiae Scopariae Herba) and Shanzhi (Gardeniae Fructus) (refer to Dampness section for treatment).

After Cold Dew (Hanlu), it is the fifth phase, governed by Yangming Dry Metal. If there is body heat, slight headache, and shivering aversion to cold, it is cooling contracted in autumn, termed Dryness Disease. Treatment requires Qiangfang Xiangsu San (Notopterygium, Saposhnikovia, and Litsea Powder) to primarily disperse the exterior pathogen. If, as Yu Jiayan states: "Qi stagnation and depression, phlegm, wheezing, vomiting, coughing without cessation leading to death with white blood," this is termed Dryness Disease, referring to internal injury. Thus, Qingzao Jiufei Tang (Clear Dryness Rescue Lung Decoction) was formulated, consisting of yin-nourishing and cooling herbs, suitable for cases where fire scorches metal and lung qi is damaged. Using these for external contraction dryness from cool seasonal qi would be applying cold to cold, worsening the disease. Must one not distinguish this?

The Classic states: "In treating diseases, one must seek the root, and first understand the annual qi." Where there is a time, there is qi; where there is qi, there are meridians and organs receiving pathogens. Thus: In spring, Liver receives it first; in summer, Heart; in late summer, Spleen; in autumn, Lung; in winter, Kidney. Therefore, warm-heat pathogens undoubtedly affect the Heart Master, Pericardium, and Sanjiao.

Spring Warmth Wind Wood, Summer Heat Sovereign/Ministerial Summerheat Fire, Late Summer Damp Earth, Autumn Cool Dry Metal, Winter Cold Cold Water—these are the Six Excesses (Liu Yin). When righteous qi contracts them, illness ensues. Naming and treating according to the specific qi was clarified earlier. If spring should be warm but is cold, summer should be hot but is cool, autumn should be cool but is hot, winter should be cold but is warm, this is the circulation of Guest Qi (Ke Qi) of wind, fire, summerheat, dampness, dryness, and cold, overlaying the Host Qi (Zhu Qi) of the four seasons, differing from normal seasonal patterns. For example, Taiyang Cold Water adding to midsummer causes cold, termed Cold Contraction; Sovereign Fire adding to deep winter causes warmth, termed Winter Warmth. Guest Qi diseases often affect entire households similarly, caused by heavenly qi influencing humans. One should treat based on the specific Guest Qi pathogen. Calling non-seasonal external contractions simply "Cold Damage" is erroneous!

Furthermore, calling it Plague (Wenyi) is absurd. Regarding Warm Disease caused by latent pathogens: The Classic says, "Winter injury by cold leads to Warm Disease in Spring." And, "Those who do not store essence in winter will contract Warm Disease in Spring." This explains the cause of Warm Disease. Zhang Zhongjing states regarding Warm Disease symptoms: "Taiyang disease with fever and thirst, without aversion to cold, is Warm Disease." Winter cold injures Foot Taiyang first. For those who did not store essence in winter, cold enters directly into the Kidney, often starting from Taiyang, meaning injury to Yin manifesting as Yang. Spring yang qi rises, carrying the pathogen outward, causing fever; fluids are consumed by latent heat, causing thirst; no exterior pathogen remains, so no aversion to cold.

It is also said: "Wind-Warmth disease presents with yin and yang pulses both floating." Kidney and Bladder, zang and fu, suffer simultaneously, hence yin and yang pulses float. Spontaneous sweating, heavy body, excessive sleepiness, snoring, difficulty speaking—all reveal Shaoyin fundamental symptoms. This describes Wind-Warmth from winter wind infection erupting in spring, which must combine with the aforementioned Taiyang symptoms of fever, thirst, and no aversion to cold. Sweating and purgation are contraindicated; error leads to death. Thus, if spring onset shows thirst, dry tongue coating, vexation, yellow-red urine, cough, asthma, rapid breathing, and exterior heat without aversion to cold, it is Winter Cold/Spring Warm Disease. Latent cold stagnates, generating heat, secretly consuming Kidney water, erupting in spring. This is severe, with only 60-70% survival. If onset shows thirst, dry tongue coating, plus headache, fever, and aversion to cold, it is combined seasonal and internal pathogen attack, similar to Two-Channel Cold Damage (Lianggan Shanghan) involving paired zang-fu organs (Kidney/Bladder, Spleen/Stomach, Liver/Gallbladder), which is incurable. Two-Channel damage is external invasion; combined attack is internal-external synergy. Must distinguish.

The major treatment for Warm Disease/Wind-Warmth from latent pathogens uses acrid-cool herbs, slight sweating to vent the exterior, nourishing yin, protecting fluids, clearing heat, and regulating the stomach. For constipation, only mild purgation is allowed, never strong purgation, to avoid damaging yin qi and causing complications. One must reference *Nanjing*: "Pulses of Warm Disease travel through various channels; identify the affected channel and treat accordingly." Pathogens reside where qi is deficient; latent pathogens erupt where zang-fu are weak, like water filling depressions. Determine the channel of eruption and treat accordingly. Head/neck pain, stiff spine → Treat Taiyang. Eye pain, dry nose, insomnia, sweating, delirium, extreme thirst, vexation → Treat Yangming. Hypochondriac pain, deafness, alternating chills/fever, vomiting, bitter taste → Treat Shaoyang. Abdominal fullness, dry throat, vomiting, inability to eat, diarrhea, abdominal pain → Treat Taiyin. Dry mouth/tongue/thirst, vexation, desire to sleep → Treat Shaoyin. Vexation/fullness, testicular retraction, wasting-thirst, qi rushing to heart, burning heart pain, hunger but no appetite, vomiting roundworms, diarrhea after purgation → Treat Jueyin. Apply Cold Damage exterior-interior principles. Zhang Zhongjing provides no fixed formula here because the correct formula exists within the symptom pattern; treat according to what is obtained.

I discuss Warm-Heat treatment, narrating four seasons/six qi diseases, Guest Qi circulation, and latent pathogen eruptions, so students learn to name syndromes by season, select pulses/herbs by syndrome, and not generalize Six Qi diseases under Cold Damage. Refer to the Classic: "Seek what is present, seek what is absent." Use the treatment method of the channel showing definite symptoms. Do not be rigid. Know that Warm-Heat exterior resolution differs from Cold Damage's acrid-warm Ma Huang, Gui Zhi, Gan Cao. Whether transmitting to Yangming, Shaoyang, Three Yin, or Hand meridians, whether clearing heat, purging interior, or saving deficiency, it always relates to Cold Damage methods. Summarized in one phrase: Preserve Fluids (Cun Jin Ye). This is the essence of treating Warm Disease.