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。
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).