仲景曰∶伤暑脉虚。又曰∶脉虚身热，得之伤暑。《脉诀》曰∶暑伤于气，所以脉虚，弦细芤迟，体状无余。《三因》
曰∶中暑之脉，阳弱阴虚，微迟似芤。《本事》曰∶暑脉弦细芤迟。何也？盖寒伤形，热伤气，气伤则气消，而脉虚弱，
所以弦细芤迟。皆虚脉也。《正传》曰∶暑脉虚而微弱，或浮大而散，或隐而不见。夫微弱隐伏，皆虚类也。《活人书》
曰∶中暑与热病相似，但热病脉盛，中暑脉虚，以此辨之。张凤逵曰∶（《脉理论》）刘复真云∶暑脉虚而微弱，按之无
力，又脉来隐伏，弦细芤迟，皆暑脉也。脉虚身热，得之伤暑。中 脉虚而微者是也。寒病传经，故脉日变；温热不传
经，故不变。寒病浮洪有力易治，芤细无力难治，无脉不治；温热不然。温有一二部无脉者，暑热有三四部无脉者，被
火所逼而伏，非绝无也，于病无妨，攻之亦易，照经用辛寒，火散脉起病愈矣。盖温热病发，在一二经，始终在此，更
不传递别经者，其一二经或洪数，则别经弱且伏，根据经络调之，伏者起，洪者平，乃愈征也。（鳌按∶此篇言热病，即
指暑病而言，非谓伏寒夏发之热病也。）
脉沉而缓，沉而细，微缓者，皆中湿。脉浮风湿；脉浮虚而涩者，寒湿；脉来滑疾，身热、烦喘、胸满、口燥、发
黄者，湿热；脉洪而缓，阴阳两虚，湿热自甚；脉洪而动，湿热为痛也；脉浮而缓，湿在表也；脉沉而缓，湿在里也；
或弦而缓，或缓而浮，皆风湿相搏也。
Zhang Zhongjing stated: The pulse in heatstroke (Shu Bing) is deficient. He also said: A deficient pulse accompanied by fever indicates injury from summerheat. *Mai Jue* (Pulse Classic) states: Summerheat damages Qi, hence the pulse is deficient; the string-like (Xian), fine (Xi), hollow (Kou), and slow (Chi) pulses are characteristic without exception. *San Yin Fang* states: The pulse in heatstroke shows weak Yang and deficient Yin, appearing faint and slow, resembling a hollow pulse. *Benshi Fang* states: The pulse in summerheat is string-like, fine, hollow, and slow. Why? Because cold damages the form, while heat damages Qi. When Qi is damaged, it dissipates, leading to a weak and deficient pulse, thus manifesting as string-like, fine, hollow, or slow. These are all types of deficient pulses. *Zhengchuan* states: The pulse in summerheat is deficient and faint, or floating and large with a scattered quality, or hidden and imperceptible. Faintness and hiding all belong to the category of deficiency. *Huo Ren Shu* states: Heatstroke resembles febrile disease, but in febrile disease the pulse is vigorous, whereas in heatstroke it is deficient; this distinguishes them. Zhang Fengkui cited Liu Fuzhen: The pulse in summerheat is deficient and faint, powerless upon pressure, and may appear hidden, string-like, fine, hollow, or slow; these are all pulses of summerheat. A deficient pulse with fever results from summerheat injury, specifically when the pulse is deficient and faint. In cold diseases, pathogens transmit through meridians, so the pulse changes daily; in warm-heat diseases, there is no transmission, so the pulse remains unchanged. In cold diseases, a floating and full pulse is easy to treat, a hollow and fine pulse is difficult, and an absent pulse is untreatable; warm-heat diseases are different. In warm diseases, one or two positions may lack a pulse; in summerheat-heat diseases, three or four positions may lack a pulse. This is due to suppression by fire pathogen causing the pulse to hide, not its absolute absence, which does not hinder the disease process and makes treatment easier. Using acrid-cold herbs according to the meridians will disperse the fire, restore the pulse, and cure the disease. Generally, warm-heat diseases originate in one or two meridians and remain there without transmitting to others. If the pulse in these meridians is full and rapid, the pulse in other meridians will be weak and hidden. Regulating according to the meridians will cause the hidden pulse to emerge and the full pulse to calm, indicating recovery. (Editor's Note: The "febrile disease" mentioned here refers to summerheat disease, not the febrile disease caused by latent winter-cold manifesting in summer.)
A sinking and slow pulse, a sinking and fine pulse, or a slightly slow pulse all indicate dampness invasion. A floating pulse indicates wind-dampness; a floating, deficient, and choppy pulse indicates cold-dampness; a slippery and rapid pulse accompanied by fever, restlessness, panting, chest fullness, dry mouth, and jaundice indicates damp-heat; a full and slow pulse indicates dual deficiency of Yin and Yang with severe damp-heat; a full and moving pulse indicates pain caused by damp-heat; a floating and slow pulse indicates dampness in the exterior; a sinking and slow pulse indicates dampness in the interior; a string-like and slow pulse, or a slow and floating pulse, all indicate the binding of wind and dampness.