《刺志论》云∶气虚身热，得之伤暑，热伤气故也。《痿论》云∶有所远行劳倦，逢大
热而渴，渴则阳气内伐，内伐则热舍于肾；肾者，水脏也。今水不能胜火，则骨枯而髓虚，
足不任身，发为骨痿。故《下经》曰∶骨痿者，生于大热也。此湿热成痿，令人骨乏无力，
故治痿独取于阳明。
时当长夏，湿热大胜，蒸蒸而炽，人感之多四肢困倦，精神短少，懒于动作，胸满气促
，肢节沉疼；或气高而喘，身热而烦，心下膨痞，小便黄而数，大便溏而频，或痢出黄如糜
，或如泔色；或渴或不渴，不思饮食，自汗体重；或汗少者，血先病而气不病也。其脉中得
洪缓，若湿气相搏，必加之以迟，迟、病虽互换少瘥，其天暑湿令则一也。宜以清燥之剂
治之。
《内经》曰∶阳气者，卫外而为固也，炅则气泄。今暑邪干卫，故身热自汗，以黄 甘
温补之为君；人参、橘皮、当归、甘草，甘微温，补中益气为臣；苍术、白术、泽泻，渗
利而除湿，升麻、葛根，甘苦平，善解肌热，又以风胜湿也。湿胜则食不消而作痞满，故炒
曲甘辛，青皮辛温，消食快气，肾恶燥，急食辛以润之，故以黄柏苦辛寒，借甘味泻热补水
虚者滋其化源；以人参、五味子、麦门冬，酸甘微寒，救天暑之伤于庚金为佐。名曰清暑益
气汤。
《刺志论》中说：气虚而身体发热，是由于感受暑邪所致，因为热邪会耗伤人体正气。《痿论》中说：如果有人远行劳倦，遇到大热天气并且口渴，口渴则阳气在内攻伐，阳气内伐则热邪留舍于肾；肾是水脏。现在水不能战胜火，就会导致骨骼枯槁、骨髓空虚，双脚无法支撑身体，从而发展为骨痿。所以《下经》说：骨痿，是由大热引起的。这是湿热导致痿证，使人骨骼乏力无力，所以治疗痿证应当专门选取阳明经。
当时正值长夏季节，湿热之气极盛，热气蒸腾炽烈，人感染后多出现四肢困倦、精神不足、懒得活动、胸中胀满、呼吸急促、肢体关节沉重疼痛；或者气息高促而喘，身体发热且心烦，胃脘部胀满痞塞，小便黄且频数，大便稀溏且次数频繁，或者痢疾排出黄色如粥状的脓血，或者像米泔水一样的颜色；或者口渴或者不渴，不想饮食，自汗出且身体沉重；或者汗少的，是血先受病而气尚未受病。其脉象中见洪缓，若湿气相搏，必定加上迟脉，虽然迟脉与洪缓脉互换时病情会有轻微好转，但天暑湿令的气候条件是一样的。适宜用清燥的方剂来治疗。
《内经》说：阳气，护卫体表并使其固密，遇热则气外泄。如今暑邪侵犯卫气，所以身体发热、自汗，以黄芪（甘温）补益作为君药；人参、橘皮、当归、甘草，味甘微温，补益中焦、益气作为臣药；苍术、白术、泽泻，渗利而除湿，升麻、葛根，味甘苦性平，善于解除肌表之热，又利用风药胜湿的原理。湿气重则食物不消化而产生痞满，所以用炒神曲（甘辛），青皮（辛温），消食理气，肾恶燥，急需食用辛味药以润之，所以用黄柏（苦辛寒），借甘味泻热补水，对于虚者滋养其化源；用人参、五味子、麦门冬，味酸甘微寒，救治暑热对肺金（庚金）的伤害作为佐药。命名为清暑益气汤。
The *Cishi Lun* (Treatise on Acupuncture and Pulse) states: "Qi deficiency with body heat arises from injury by summerheat, as heat injures Qi." The *Fei Lun* (Treatise on Flaccidity Syndromes) states: "If one travels far and becomes fatigued, encountering intense heat and thirst, thirst causes Yang Qi to attack internally. Internal attack leads to heat lodging in the Kidney; the Kidney is the Water organ. Now, if Water cannot overcome Fire, the bones become withered and the Marrow empty, the feet are unable to support the body, developing into Bone Flaccidity (*Gu Wei*). Therefore, the *Xia Jing* (Classic of the Lower Section) says: 'Bone Flaccidity arises from intense heat.' This refers to Damp-Heat causing Flaccidity, making the bones weak and powerless; thus, in treating Flaccidity syndromes, one exclusively selects the Yangming channel.
At this time, it is late summer, where Damp-Heat prevails overwhelmingly, steaming and blazing intensely. When humans contract it, they often experience fatigue in the four limbs, shortness of spirit, reluctance to move, chest fullness, rapid breathing, heaviness and pain in the joints; or high-pitched breath with panting, body heat with vexation, epigastric distension and痞感 (stagnation), yellow and frequent urination, loose and frequent stools, or dysentery discharging yellow pus resembling congee, or fluid resembling rice wash water; or thirst or no thirst, lack of appetite, spontaneous sweating, and heavy body; or scanty sweating, indicating that Blood was diseased first while Qi remained unaffected. Their pulse is洪缓 (Surging and Slow/Relaxed); if Dampness combats with Heat, a 迟 (Slow) pulse must be added. Although the condition may slightly improve when the Slow pulse replaces the Surging-Slow pulse, the climatic influence of summer heat and dampness remains the same. It is appropriate to treat this with a formula for clearing dryness and heat.
The *Neijing* (Inner Canon) states: "Yang Qi guards the exterior and maintains solidity; when hot, Qi leaks out." Now, Summerheat pathogen invades the Defensive Qi, causing body heat and spontaneous sweating. Huangqi (Astragali Radix, Sweet and Warm) tonifies as the Sovereign herb; Renshen (Ginseng Radix), Chenpi (Citri Reticulatae Pericarpium), Danggui (Angelicae Sinensis Radix), and Gancao (Glycyrrhizae Radix et Rhizoma), Sweet and Slightly Warm, tonify the Middle and benefit Qi as the Minister herbs; Cangzhu (Atractylodis Rhizoma), Baizhu (Atractylodis Macrocephalae Rhizoma), and Zexie (Alismatis Rhizoma), promote urination and drain Dampness; Shengma (Cimicifugae Rhizoma) and Gegen (Puerariae Lobatae Radix), Sweet, Bitter, and Neutral, excel at releasing muscle-layer heat, further utilizing Wind herbs to overcome Dampness. Excessive Dampness prevents food digestion and causes fullness/stagnation, so Chaoqu (Fermented Wheat Mass, Sweet and Pungent) and Qingpi (Citri Reticulatae Pericarpium Viride, Pungent and Warm) digest food and regulate Qi. The Kidney detests dryness; urgently, one should consume Pungent substances to moisten it. Thus, Huangbai (Phellodendri Cortex, Bitter, Pungent, Cold) is used; borrowing Sweet flavor to clear heat and replenish fluids, for deficiency cases, nourishing their source of transformation. Renshen (Ginseng Radix), Wuweizi (Schisandrae Fructus), and Maidong (Ophiopogonis Radix), Sour, Sweet, and Slightly Cold, rescue the Lung Metal (Geng Metal) injured by summer heat as the Assistant herbs. Named Qing Shu Yi Qi Tang (Clear Summerheat and Benefit Qi Decoction).