麻疹呕吐，是胃中毒火，不能发泄，郁而上攻，须以竹茹石膏汤，和中清热，其吐
自止。若吐清涎白沫，亦胃火内逼，津液上泛，又有吐出如药者，有吐出成块者，皆宜
降火消痰，用花粉、贝母、甘桔、芩连、杏仁、桑皮、麦冬之类，南星、半夏等燥药，又
不可妄用。
虫之吐下，见于将出正出之间，因胃中有热，膈上有痰，虫不能安，所以吐而下也。
正没没后犯此，是热重不纳食，虫无所养，思食而出，若过十余条，则有虫厥之变。初热
吐虫者，是脾胃亏虚，疹必难出，大非所宜。没后下虫，乃胃热未清，热退自愈。
凡麻疹烦渴者，乃毒火壅甚也，心为热扰，神志不得安然，故嘈杂而烦，胃因热郁，
津液被火烁耗，故口干而渴。初出用升麻葛根汤，加麦冬、花粉，已出用白虎汤，没后
用竹叶石膏汤。若烦至干燥，渴无已时，则亦难矣。
谵妄一症，乃真气昏昧，神识不清所致。夫心藏神而主火，病则热气归焉。麻疹胃中
热甚，上乘于心，心为热冒，则神明昏乱，而言无伦次，遂成谵妄之语。未出宜三黄石膏
汤治之，已出用黄连解毒汤治之。
麻症发搐，不可以急惊风同论。初热见形之时，热势勃勃，周身气扰动筋络，遂抽
搐，无甚大害，只宜疏散，加以清凉。若没后壮热不除，忽作搐者，宜导赤散，加人参、
麦冬，送七味安神丸。小便清者可治，短少者难治。如见多痰，或用抱龙丸，或以四物
汤，加麦冬、枣仁、淡竹叶、龙胆草、甘草、黄连、茯苓、辰砂、石菖蒲之类。
麻疹引起的呕吐，是由于胃中毒火炽盛，无法向外发泄，郁结后向上冲逆所致。应当使用竹茹石膏汤来调和脾胃、清除热邪，呕吐自然就会停止。如果吐出的是清稀的涎液和白沫，这也是胃火内逼，导致津液上泛；还有吐出物像药物形状或结成块状的，都适宜采用降火消痰的方法治疗，可以使用天花粉、贝母、甘草与桔梗、黄芩与黄连、杏仁、桑白皮、麦冬等药材。但是，南星、半夏这类燥烈之药，又不可随意滥用。
虫体引发的呕吐和下利，多出现在麻疹即将发出或正在发出的阶段。这是因为胃中有热，膈上有痰，导致虫体不安稳，所以出现呕吐和下利。如果在麻疹消退之后才出现这种情况，是因为热邪严重导致不能进食，虫体缺乏营养滋养，想要寻找食物而排出。如果排出的虫体超过十余条，则可能引发“虫厥”这种变证。在初热期就吐虫的，说明脾胃亏虚，疹毒必然难以透出，这是非常不利的情况。麻疹消退后下虫，是因为胃热尚未清除，待热退后自然会痊愈。
凡是麻疹患者出现心烦口渴症状的，是毒火壅滞严重的表现。心受到热邪扰乱，神志不能安宁，所以感到心中嘈杂且烦躁；胃因热邪郁结，津液被火热灼烧消耗，所以口干且口渴。疹子刚发出时，用升麻葛根汤，加入麦冬、天花粉；疹子已经发出后，用白虎汤；疹子消退后，用竹叶石膏汤。如果出现极度烦躁干燥、口渴不止的情况，那就比较难治了。
谵妄这一症状，是由于真气昏昧、神识不清所导致的。心主藏神并属火，患病时热气会归聚于心。麻疹患者胃中热势极盛，热气上乘侵犯心脏，心被热邪蒙蔽，导致神明昏乱，言语没有条理，从而形成谵妄的话语。疹子未发出时，宜用三黄石膏汤治疗；疹子已发出后，用黄连解毒汤治疗。
麻疹引发的抽搐，不能简单地等同于急惊风来讨论。在初热期见到皮疹形态时，热势旺盛，周身气机扰动筋络，于是出现抽搐，这通常没有太大的危害，只适宜采用疏散风热、辅以清凉的方法。如果在麻疹消退后壮热不退，突然发生抽搐，宜用导赤散，加入人参、麦冬，送服七味安神丸。如果小便清长，表示可以治疗；如果小便短少，则表示难治。如果看到痰多的情况，可以使用抱龙丸，或者使用四物汤，加入麦冬、酸枣仁、淡竹叶、龙胆草、甘草、黄连、茯苓、辰砂、石菖蒲等药材。
Vomiting caused by measles is due to the accumulation of toxic fire in the stomach that cannot be vented outward. The stagnation rises and attacks upward. One should use Zhuru Shigao Tang (Bamboo Shavings and Gypsum Decoction) to harmonize the middle jiao and clear heat, after which the vomiting will naturally cease. If clear saliva and white foam are vomited, this is also due to internal stomach fire forcing fluids to rise upward. In cases where vomitus resembles medicinal herbs or forms clumps, it is appropriate to employ methods to descend fire and resolve phlegm. Herbs such as Tianhuafen (Trichosanthis Radix), Beimu (Fritillariae Bulbus), Gancao (Licorice Root) combined with Jiegeng (Platycodonis Radix), Huangqin (Scutellariae Radix) combined with Huanglian (Coptidis Rhizoma), Xingren (Prunus Semen), Sangbaipi (Mori Cortex), and Maidong (Ophiopogonis Radix) may be used. However, drying agents such as Nanting (Arisaematis Tuber) and Banxia (Pinelliae Rhizoma) must not be used recklessly.
Vomiting and diarrhea caused by intestinal parasites often occur between the onset and eruption phases of measles. This is because heat in the stomach and phlegm above the diaphragm disturb the parasites, causing them to move restlessly, leading to vomiting and purging. If this occurs after the measles rash has subsided, it indicates severe heat preventing food intake; lacking nourishment, the parasites seek food and exit. If more than ten worms are expelled, there is a risk of "worm convulsion" (Chong Jue). Vomiting worms during the initial fever stage suggests deficiency of the spleen and stomach, making it difficult for the rash to erupt, which is highly unfavorable. Parasites passing down after the rash subsides indicate residual stomach heat; this will resolve spontaneously once the heat recedes.
Restlessness and thirst in measles patients signify severe obstruction by toxic fire. The heart is disturbed by heat, preventing the spirit from remaining tranquil, resulting in epigastric discomfort and irritability. Heat stagnation in the stomach scorches and consumes body fluids, causing dry mouth and thirst. When the rash first appears, use Shengma Gegen Tang (Ephedra and Pueraria Decoction) added with Maidong (Ophiopogonis Radix) and Tianhuafen (Trichosanthis Radix). After the rash has fully erupted, use Baihu Tang (White Tiger Decoction). After the rash subsides, use Zhuye Shigao Tang (Bamboo Leaf and Gypsum Decoction). If restlessness becomes extreme with dryness and unquenchable thirst, the condition becomes difficult to treat.
Delirium is caused by the dimming of true qi and unclear consciousness. The Heart stores the spirit and governs fire; when diseased, heat energy converges upon it. In measles, excessive heat in the stomach ascends to invade the Heart. When the Heart is obscured by heat, the spirit becomes chaotic, speech becomes incoherent, and delirious speech ensues. Before the rash appears, Sanhuang Shigao Tang (Three Yellows and Gypsum Decoction) is suitable for treatment. After the rash appears, Huanglian Jiedu Tang (Coptis Decoction for Resolving Toxicity) should be used.
Convulsions occurring in measles should not be equated with acute wind-stroke (Ji Jing Feng). During the initial fever stage when the rash begins to show, intense heat agitates the qi and disturbs the sinews and collaterals throughout the body, leading to convulsions. This usually poses no serious harm and requires only dispersal and cooling measures. However, if high fever persists after the rash subsides and sudden convulsions occur, use Daochi San (Guide Out Red Powder) added with Renshen (Ginseng Radix et Rhizoma) and Maidong (Ophiopogonis Radix), administered with Qiwei Anshen Wan (Seven-Ingredient Calming Spirit Pill). If urine is clear, the condition is treatable; if urine is scanty, it is difficult to treat. If excessive phlegm is observed, Baolong Wan (Embrace Dragon Pill) may be used, or Siwu Tang (Four Substances Decoction) can be modified with Maidong (Ophiopogonis Radix), Zaoren (Ziziphi Spinosae Semen), Danzhuyeh (Lophatheri Herba), Longdancao (Gentianae Radix), Gancao (Licorice Root), Huanglian (Coptidis Rhizoma), Fuling (Poria), Chensha (Cinnabar), and Shichangpu (Acori Tatarinowii Rhizoma).