同是夏月病也，头痛，身热、面垢、自汗，而暑热分焉。暑为阴邪，热为阳邪，观于天地可知矣。炎风翕
，草木荣而就枯；烈日熏蒸，沟洫盈而立涸。阳气发散于外者，底里必然虚空。源远之井，清冷如冰；岩谷
之风，寒凄若刺。人，一小天地也，深居房室静坐不啻趋炎，奔走道涂，周行常思荫 。阳气发泄于外者，底
里亦必虚空，举动
心艰，肢体疲倦，居恒气短，精力衰颓。故其为病，亦因其气而感之耳。其中暑也，感地窍之气，阴与阴遇，
头痛身热、面垢自汗，与中热无异。而小便清利、大便溏泻、呕吐少气、安静好眠、脉则虚怯（亦有虚数者），
较之中热，大相径庭焉。暑必伤气，非黄 不足以益其气；暑必兼湿，非焦术不足以燥其湿；暑必积寒，非
附子不足以温其寒（经验方∶附子、焦术、黄 、干姜、苡米、扁豆、云苓、炙草）。洁古曰∶静而得之为中
暑是也。其中热也，感天炎之气，阳与阳遇，头痛身热、面垢自汗，与中暑无异，而小便赤涩、大便坚硬、胸
满气喘、烦躁不眠、脉则洪数，较之中暑，殊隔天渊焉。热甚发燥，非麦冬不足以清其燥；热甚为毒，非黄连
不足以解其毒；热甚涸水，非猪苓不足以利其水（经验方∶麦冬、黄芩、泽泻、焦术、猪苓、茯苓、前仁、炙
草）。洁古曰∶动而得之为中热是也。五行之中，惟火有二，所以五运而有六气也。有六气，因有风寒暑热燥
火，六淫热即火病也。方书所注，有谓暑为阳邪，心属离火，故暑也入心，吾不知将热置于何地；有将暑分阴
症阳症，而火则牵扯诸火，亦知火乃六淫内之火乎；有以暑为夏月之伤寒，吾不知暑又是何病。千书一律，
开卷茫然，总于五运六气，未能细心体认。余因参互考订，力为剖别，验之于症，实有毫发不差者。
同样是夏季发生的疾病，出现头痛、身体发热、面部油腻污垢、自然出汗等症状，但暑病和热病是有区别的。暑邪属于阴邪，热邪属于阳邪，观察天地自然现象就可以知道了。炽热的风吹拂，草木繁荣却走向枯槁；烈日暴晒蒸腾，沟渠积水充盈却立刻干涸。阳气发散在体外的，体内必然空虚。水源深远的井水，清凉如冰；岩石山谷中的风，寒冷凄厉如同针刺。人，是微小的天地，如果深居室内静坐，无异于趋炎附势（主动接近热源）；如果在道路上奔波行走，常常想着寻找树荫避暑。阳气发泄在体外的，体内也必然空虚，导致举动时心中艰难，肢体疲倦，平时气短，精力衰颓。所以这类疾病，也是因人体之气虚弱而感受外邪所致。
其中暑病，是感受了地窍（地下/阴凉处）的湿气，阴邪与阴邪相合，症状表现为头痛身热、面部油腻、自然出汗，这与中热病没有区别。但是小便清长通畅、大便溏泻、呕吐、气少、安静嗜睡、脉象虚怯（也有虚数脉的），与中热病相比，截然不同。暑邪必定伤气，不用黄芪不足以补益其气；暑邪必定兼夹湿邪，不用炒白术不足以燥湿；暑邪必定积聚寒邪，不用附子不足以温散其寒。（经验方：附子、炒白术、黄芪、干姜、薏苡仁、扁豆、云茯苓、炙甘草）。张洁古说：静处所得的为中暑，正是如此。
其中热病，是感受了天上炎烈的气候，阳邪与阳邪相合，症状表现为头痛身热、面部油腻、自然出汗，这与中暑病没有区别。但是小便赤红涩痛、大便坚硬、胸中胀满气喘、烦躁不眠、脉象洪大数急，与中暑病相比，相差如天壤之别。热盛导致津液干燥，不用麦冬不足以清除其燥热；热盛化为毒邪，不用黄连不足以解除其毒热；热盛耗竭津液，不用猪苓不足以利水渗湿。（经验方：麦冬、黄芩、泽泻、炒白术、猪苓、茯苓、车前子、炙甘草）。张洁古说：动处所得的中热，正是如此。
五行之中，只有“火”有两种属性，所以五运之中有六气。有了六气，便产生了风、寒、暑、热、燥、火六种淫邪，热极即为火病。医书中记载，有的说暑为阳邪，心属离火，所以暑邪入心，我不知道将热邪置于何地；有的将暑分为阴证和阳证，而火则牵扯各种火邪，他们可知火乃是六淫内部之火吗？有的以暑为夏季的伤寒，我不知道暑又是什么病。千书一律，打开书本茫然不知，总归是对五运六气未能细心体认。我因此参互考订，极力剖析辨别，验证于病症，确实有毫发不差的地方。
Although both are diseases occurring in summer, presenting with headache, fever, greasy face, and spontaneous sweating, there is a distinction between *Shu* (Summerheat) disease and *Re* (Heat) disease. *Shu* pathogen belongs to Yin evil, while *Re* pathogen belongs to Yang evil; this can be understood by observing the natural world. When scorching winds blow, flora flourishes yet approaches withering; when intense sun irradiates and steams, ditches fill with water but quickly dry up. When Yang Qi dissipates outwardly, the interior must inevitably be empty. Wells with deep sources have water as cold as ice; winds from rocky valleys are chilling and piercing like needles. Humans are microcosms of heaven and earth. Those who stay indoors and sit quietly are akin to seeking warmth (approaching heat); those who rush along roads often seek shade. When Yang Qi dissipates outwardly, the interior also becomes empty, leading to mental difficulty in movement, limb fatigue, chronic shortness of breath, and declining vitality. Therefore, these illnesses arise from the body's Qi deficiency allowing external pathogens to invade.
In *Zhong Shu* (Heatstroke), one contracts the damp Qi from subterranean or shaded places. Yin meets Yin. Symptoms include headache, fever, greasy face, and spontaneous sweating, which appear no different from *Zhong Re* (Sunstroke). However, the urine is clear and profuse, stools are loose, vomiting occurs, Qi is deficient, the patient is quiet and prone to sleep, and the pulse is weak and timid (sometimes weak and rapid). Compared to *Zhong Re*, they are vastly different. Summerheat invariably damages Qi; without Huangqi (Astragali Radix), Qi cannot be sufficiently tonified. Summerheat invariably combines with Dampness; without Jiaozhu (Stir-fried Atractylodis Rhizoma), Dampness cannot be sufficiently dried. Summerheat invariably accumulates Cold; without Fuzi (Aconiti Lateralis Radix Praeparata), Cold cannot be sufficiently warmed. (Empirical Formula: Fuzi, Jiaozhu, Huangqi, Ganjiang, Yiyiren, Bian Dou, Yunling, Zhigancao). Zhang Jiegu stated: "Obtained while resting is Zhong Shu."
In *Zhong Re* (Sunstroke), one contracts the scorching Qi from the sky. Yang meets Yang. Symptoms include headache, fever, greasy face, and spontaneous sweating, appearing no different from *Zhong Shu*. However, the urine is red and scanty/difficult, stools are hard, chest fullness and panting occur, restlessness and insomnia are present, and the pulse is surging and rapid. Compared to *Zhong Shu*, they are worlds apart. When Heat is extreme causing dryness, Maidong (Ophiopogonis Radix) is indispensable to clear dryness. When Heat becomes toxic, Huanglian (Coptidis Rhizoma) is indispensable to resolve toxicity. When Heat depletes fluids, Zhuling (Polypori Umbellati Sclerotium) is indispensable to promote urination. (Empirical Formula: Maidong, Huangqin, Zexie, Jiaozhu, Zhuling, Fuling, Qianren, Zhigancao). Zhang Jiegu stated: "Obtained while moving is Zhong Re."
Among the Five Elements, only Fire has two aspects, hence within the Five Movements there are Six Qi. With Six Qi come the six pernicious influences: Wind, Cold, Summerheat, Heat, Dryness, and Fire. Extreme Heat is Fire disease. Medical texts note that "Summerheat is Yang evil, Heart belongs to Li Fire, thus Summerheat enters the Heart"; I do not know where Heat is placed in this logic. Some divide Summerheat into Yin and Yang syndromes, while associating Fire with various Fires; do they realize that Fire is the internal Fire of the six pernicious influences? Some equate Summerheat with Cold Damage in summer; I do not know what disease Summerheat truly is. Thousands of books repeat the same errors, leaving readers bewildered, largely due to a failure to carefully comprehend the Five Movements and Six Qi. I therefore cross-referenced and verified, striving to distinguish them clearly. Validated against symptoms, the distinctions are indeed precise to the hair's breadth.