李氏曰∶潮热有时，为内伤为虚，无时为外感为实。虚者，大温经汤；热者，四物汤加
柴胡、黄芩；经闭者，滋血汤；骨蒸者，大胡连丸、大乌鸡丸；五心潮者，四物汤加黄连、
胡黄连；无汗者，茯苓补心汤；有汗者，逍遥散；经前潮者，血虚有滞，逍遥散加牡丹皮、
桃仁、玄胡索；经后潮者，血虚有热，逍遥散去柴胡，换地骨皮，加生地黄，此药加减为退
热圣药（逍遥散为退热圣药，须善加减），寻常潮热者，肾气丸、大造丸，或四物汤料加便炒黄芩一两，四制香附一斤，
蜜丸
吴茭山治一妇，经血过多，五心烦热，日晡潮热，诸药无效，以四物加胡黄连三服而愈
。薛新甫治一妇人，经候过期，发热倦怠，或用四物黄连之类，反两月一度，且少而成块，
又用峻药通之，两目如帛所蔽。薛曰∶脾为诸阴之首，目为血脉之宗，此脾伤，五脏皆为失
所，不能归于目矣。遂用补中益气、《济生》归脾二汤，专主脾胃，年余寻愈。《大全》云
∶客热者因体虚，而将温过度，外热加之，非脏腑自生，故云客热。其状上焦胸膈之间虚热
，口燥心烦，手足壮热者是也。
薛氏曰∶前证若客邪所侵，补中益气加川芎、防风（客邪而补中益气，须细心体认，证脉相参）；肝虚血少，
六味地黄丸；胃火饮冷
，钱氏泻黄散；胃虚饮汤，七味白术散（必真虚者方可，不然恐罹实实之害）；潮热时热，八珍汤；晡热内热，逍遥散；
发热体倦
，补中益气汤；恚怒发热，小柴胡汤；寅卯酉戌时热，升阳益阴汤。
李氏说：潮热（定时发热）有固定时间，属于内伤虚证；没有固定时间的发热，属于外感实证。对于虚证，使用大温经汤；对于热证，使用四物汤加柴胡、黄芩；对于经闭者，使用滋血汤；对于骨蒸（阴虚火旺引起的自觉骨中发热）者，使用大胡连丸、大乌鸡丸；对于五心（两手心、两足心及心胸）潮热者，使用四物汤加黄连、胡黄连；对于无汗者，使用茯苓补心汤；对于有汗者，使用逍遥散；对于经前潮热者，属于血虚兼有瘀滞，用逍遥散加牡丹皮、桃仁、玄胡索；对于经后潮热者，属于血虚兼有内热，用逍遥散去柴胡，换用地骨皮，加生地黄，这些药物的加减变化是退热的圣药（逍遥散作为退热的圣药，必须善于灵活加减）。寻常的潮热者，可用肾气丸、大造丸，或者用四物汤的药料加便炒黄芩一两，四制香附一斤，制成蜜丸。
吴茭山治疗一位妇女，经血过多，五心烦热，日晡（下午3-5点）潮热，各种药物无效，用四物汤加胡黄连服用三剂而痊愈。
薛新甫治疗一位妇人，月经过期不来，发热且倦怠乏力，有人用四物汤加黄连之类的药物，反而导致两个月来一次月经，且量少而成块状，又用峻猛的药物通经，结果两眼像被布遮住一样模糊不清。薛氏说：脾为诸阴之首，目为血脉之宗，这是脾脏受伤，五脏都失去了安顿之所，精气不能上注于目了。于是采用补中益气汤和《济生方》归脾汤，专门调理脾胃，一年多后逐渐痊愈。
《大全》说：客热（外来邪气引起的发热）是因为身体虚弱，在调养时过度温热，外加热邪侵袭所致，并非脏腑自己产生的热，所以称为客热。其症状表现为上焦胸膈之间虚热，口干燥，心烦意乱，手足壮热。
薛氏说：上述病症如果是客邪所侵，用补中益气汤加川芎、防风（针对客邪使用补中益气汤，必须细心体会，结合证候和脉象参详）；肝虚血少，用六味地黄丸；胃火旺盛想喝冷饮，用钱氏泻黄散；胃虚想喝热汤，用七味白术散（必须是真正的虚证才可以，否则恐怕会犯“实实”之戒，即对实证误用补法加重病情）；潮热伴有定时发热，用八珍汤；日晡发热伴有内热，用逍遥散；发热且身体疲倦，用补中益气汤；因愤怒而发热，用小柴胡汤；寅时、卯时、酉时、戌时发热，用升阳益阴汤。
Li stated: Tidal fever (fever occurring at fixed times) with a regular schedule indicates internal injury and deficiency; fever without a fixed schedule indicates external contraction and excess. For deficiency patterns, Da Wen Jing Tang (Great Warming of the Menses Decoction) is used; for heat patterns, Si Wu Tang (Four Substances Decoction) combined with Chai Hu (Bupleuri Radix) and Huang Qin (Scutellariae Radix) is prescribed; for amenorrhea, Zi Xue Tang (Nourishing Blood Decoction) is employed; for bone-steaming fever (a sensation of heat emanating from the bones due to yin deficiency and fire hyperactivity), Da Hu Lian Wan (Great Coptis Pill) and Da Wu Ji Wan (Great Black Chicken Pill) are utilized; for tidal fever of the five centers (palms, soles, and chest), Si Wu Tang (Four Substances Decoction) combined with Huang Lian (Coptidis Rhizoma) and Hu Huang Lian (Picrorhizae Rhizoma) is given; for those without sweating, Fu Ling Bu Xin Tang (Poria Nourishing Heart Decoction) is administered; for those with sweating, Xiao Yao San (Free and Easy Wanderer Powder) is used. For tidal fever preceding menstruation, it indicates blood deficiency with stasis; Xiao Yao San (Free and Easy Wanderer Powder) is modified with Mu Dan Pi (Moutan Cortex), Tao Ren (Persicae Semen), and Yuan Hu Suo (Corydalis Rhizoma). For tidal fever following menstruation, it indicates blood deficiency with heat; Xiao Yao San (Free and Easy Wanderer Powder) is modified by removing Chai Hu (Bupleuri Radix), substituting Di Gu Pi (Lycii Cortex), and adding Sheng Di Huang (Rehmanniae Radix). These modifications constitute the supreme remedies for reducing fever (Xiao Yao San (Free and Easy Wanderer Powder) serves as a supreme remedy for fever reduction, requiring adept modification). For ordinary tidal fever, Shen Qi Wan (Kidney Qi Pill), Da Zao Wan (Great Creation Pill), or a honeyed pill made from Si Wu Tang (Four Substances Decoction) ingredients plus one liang of stir-fried Huang Qin (Scutellariae Radix) and one jin of Si Zhi Xiang Fu (Cyperi Rhizoma processed in four ways) may be used.
Wu Jiaoshan treated a woman who suffered from excessive menstrual bleeding, five-center vexation and heat, and afternoon tidal fever (fever worsening between 3-5 PM). Various medications proved ineffective. She was cured after taking three doses of Si Wu Tang (Four Substances Decoction) combined with Hu Huang Lian (Picrorhizae Rhizoma).
Xue Xinpu treated a woman whose menstruation was delayed, accompanied by fever and fatigue. The use of Si Wu Tang (Four Substances Decoction) combined with Huang Lian (Coptidis Rhizoma) and similar herbs resulted in menstruation occurring only once every two months, with scanty flow and clots. Subsequently, harsh purgative medicines were used to unblock the menses, leading to blurred vision as if covered by cloth. Xue stated: The Spleen is the head of all yin organs, and the eyes are the gathering place of blood vessels. This injury to the Spleen causes all five zang organs to lose their proper residence, preventing essence and blood from ascending to the eyes. He therefore employed Bu Zhong Yi Qi Tang (Tonify the Middle and Augment the Qi Decoction) and Gui Pi Tang (Restore the Spleen Decoction) from *Ji Sheng Fang*, focusing specifically on the Spleen and Stomach. After more than a year, she gradually recovered.
*Da Quan* states: Guest heat (heat caused by external pathogenic factors) arises because the body is deficient, and during convalescence, excessive warming measures are applied, allowing external heat to invade. It is not heat generated internally by the zang-fu organs, hence it is called guest heat. Its manifestations include empty heat in the upper jiao between the chest and diaphragm, dry mouth, mental restlessness, and intense heat in the hands and feet.
Xue stated: If the aforementioned conditions are caused by invasion of guest pathogens, Bu Zhong Yi Qi Tang (Tonify the Middle and Augment the Qi Decoction) combined with Chuan Xiong (Ligustici Chuanxiong Rhizoma) and Fang Feng (Saposhnikoviae Radix) should be used (when using Bu Zhong Yi Qi Tang (Tonify the Middle and Augment the Qi Decoction) for guest pathogens, careful discernment is required, correlating symptoms and pulse); for Liver deficiency and blood insufficiency, Liu Wei Di Huang Wan (Six-Ingredient Pill with Rehmannia) is indicated; for stomach fire with a desire for cold drinks, Qian Shi Xie Huang San (Child Master's Draining Yellow Powder) is prescribed; for stomach deficiency with a desire for warm drinks, Qi Wei Bai Zhu San (Seven-Ingredient Atractylodes Macrocephala Powder) is used (this must be applied only when true deficiency exists; otherwise, there is a risk of committing the error of "treating excess as excess," i.e., aggravating an excess condition by applying tonification); for tidal fever with periodic heat, Ba Zhen Tang (Eight Treasures Decoction) is employed; for afternoon fever with internal heat, Xiao Yao San (Free and Easy Wanderer Powder) is used; for fever accompanied by physical fatigue, Bu Zhong Yi Qi Tang (Tonify the Middle and Augment the Qi Decoction) is administered; for fever induced by anger, Xiao Chai Hu Tang (Minor Bupleurum Decoction) is prescribed; for fever occurring at Yin, Mao, You, and Xu hours, Sheng Yang Yi Yin Tang (Raise Yang and Nourish Yin Decoction) is used.