麻疹发热之初与伤寒相似，惟疹子则面颊赤，咳嗽喷嚏，鼻流清涕，目中有泪，呵欠善
睡，或吐泻，或手捋眉目面赤为异耳，但见此候即是疹子，便宜谨避风寒，戒荤腥浓味。古
法用升麻葛根汤以表散毒邪，余制透邪煎代之更佳，或柴归饮亦妙。但使皮肤通畅腠理开
豁，则疹毒易出。不可作伤寒，妄加汗下也。妄汗则增热，而为衄血咳血，为口疮咽痛，为目赤肿，为烦躁干
渴，为大小便不通。妄下则里虚，为滑泄，为滞下。经曰∶必先岁气，母伐天和，言不可妄汗妄下也。
凡疹初热疑似之间，切不可轻易用药，总有他证，必待五日腮下见疹，方可用升表之
剂。嗽多，连打喷嚏，鼻流清涕，或流鼻血，饮食减少，好饮凉水，只宜调理饮食，戒荤腥面食。
疹子初发热时未见出现，咳嗽百十余声不已，上气喘急而目胞肿，时卧时起，此火毒
内蒸，肺叶焦举，宜甘桔汤合白虎汤加牛蒡子薄荷主之。如疹出之时咳嗽口干心烦者，此毒
在心肺，发未尽也，泻白散加天花粉连翘元参黄连主之。
疹子欲出未出之时，宜早为发散，以散其毒则无余患，若不预解使之尽出，多致毒蓄于
中，或为壮热，久枯瘁，或成惊痫，或为泻痢，或为咳血喘促，或作疳蚀而死，此虽一时戾气
之染，然未有不由于人事之未尽也。
麻疹在发热初期与伤寒症状相似，只是出疹子的患者会出现面颊发红、咳嗽打喷嚏、流清鼻涕、眼睛流泪、打哈欠且容易嗜睡，或者伴有呕吐腹泻，或者出现手抓眉目、面部发红等异常表现。只要见到这些征候，就可以确定是麻疹，此时应当谨慎避免风寒，禁止食用荤腥和味道浓烈的食物。
古代方法使用升麻葛根汤来发散毒邪，我创制的透邪煎替代它效果更好，或者使用柴归饮也很妙。只要使皮肤通畅、腠理（皮肤纹理及汗孔）开泄，那么疹毒就容易透出。不可将其当作伤寒，胡乱使用发汗或攻下的疗法。
胡乱发汗会导致热势加重，并引起鼻出血、咳血、口疮咽痛、眼睛红肿、烦躁口渴、大小便不通等症状。胡乱攻下则会导致体内虚弱，引起滑脱性腹泻或痢疾。医经说：“必须顺应岁气，不要损伤人体的和谐之气”，指的就是不可胡乱发汗或攻下。
凡是麻疹初起发热、症状疑似难辨时，切不可轻易用药。即使有其他证候，也必须等到第五天腮部下方出现疹子后，才可以使用发表透疹的药剂。
如果咳嗽频繁，连续打喷嚏，流清鼻涕，或者流鼻血，饮食减少，喜欢喝凉水，只适宜调理饮食，禁止食用荤腥和面食。
麻疹初发热时，疹点尚未发出，若咳嗽一百多声不止，气喘急促且眼睑肿胀，时而躺卧时而坐起，这是火毒在内蒸腾，导致肺叶焦枯上举，宜用甘桔汤合白虎汤加牛蒡子、薄荷主治。
如果在出疹期间出现咳嗽、口干、心烦，这是毒邪在心肺，疹毒尚未发尽，宜用泻白散加天花粉、连翘、元参、黄连主治。
在疹子欲出未出的时候，宜尽早进行发散治疗，以疏散毒邪从而消除后患。如果不预先解毒使其完全透出，大多会导致毒邪蓄积在体内，进而引发高热、长期消瘦憔悴，或者形成惊痫，或者导致腹泻痢疾，或者引起咳血喘促，甚至因疳蚀而死。这虽然是一时戾气（疫疠之气）的感染，但无不与人处理不当有关。
At the initial stage of fever, measles resembles Taiyang disease (a syndrome caused by pathogenic factors invading the Taiyang meridian). However, patients with measles present with redness of the cheeks, coughing and sneezing, clear nasal discharge, tearing eyes, yawning and drowsiness, or vomiting and diarrhea, or rubbing the eyebrows and eyes with hands accompanied by facial redness. The appearance of these signs confirms the diagnosis of measles. At this time, one should carefully avoid wind and cold, and abstain from meat and strong-flavored foods.
Ancient methods used Shengma Gegen Tang (Cimicifugae Rhizoma and Puerariae Radix Decoction) to disperse toxic pathogens. My formulated Touxie Jian (Decoction for Expelling Pathogens) serves as a superior substitute, while Chaiyin Yin (Bupleurum and Angelica Drink) is also excellent. As long as the skin remains unobstructed and Couli (the interstices of the skin and hair follicles) are open, the measles toxin will be easily expelled. One must not treat it as Taiyang disease and recklessly apply sweating or purging methods.
Reckless sweating increases heat and may lead to epistaxis (nosebleed), hemoptysis (coughing up blood), mouth sores and sore throat, red and swollen eyes, irritability, dry thirst, and obstruction of urination and defecation. Reckless purging causes interior deficiency, leading to incontinence or dysentery. The Classics state: "One must first consider the seasonal qi and not damage the harmony of heaven and humanity," referring to the prohibition of reckless sweating and purging.
During the initial fever of measles, when symptoms are ambiguous, medication should never be administered lightly. Even if other syndromes are present, one must wait until the fifth day when rashes appear below the cheeks before using exterior-releasing agents.
If there is frequent coughing, continuous sneezing, clear nasal discharge, or epistaxis, along with reduced appetite and a preference for cold water, only dietary regulation is appropriate, avoiding meat and wheat products.
When measles fever begins but the rash has not yet erupted, if the patient coughs incessantly (over a hundred times), suffers from rapid breathing and swollen eyelids, and alternates between lying down and sitting up, this indicates internal steaming of fire-toxin causing the lungs to become scorched and elevated. This should be treated with Ganjie Tang (Licorice and Platycodon Decoction) combined with Baihu Tang (White Tiger Decoction), added with Niubangzi (Arctii Fructus) and Bohe (Menthae Haplocalycis Herba).
If during the eruption phase the patient experiences cough, dry mouth, and irritability, this indicates the toxin is located in the Heart and Lungs and has not fully erupted. This should be treated with Xiebai San (Draining White Powder), added with Tianhuafen (Trichosanthis Radix), Lianqiao (Forsythiae Fructus), Yuanshen (Scrophulariae Radix), and Huanglian (Coptidis Rhizoma).
When the rash is about to erupt but has not yet appeared, early dispersing treatment is advisable to scatter the toxin and prevent future complications. If the toxin is not preemptively resolved and fully expelled, it tends to accumulate within, potentially leading to high fever, chronic emaciation, convulsions and epilepsy, diarrhea and dysentery, hemoptysis and wheezing, or death from gan erosion (nutritional deficiency ulcers). Although this is an infection by Liqi (pestilential qi), it invariably results from inadequate human management.