麻疹未出之先，一受风寒，令儿肌肤干燥，腠理闭密，遂至
疹毒不得发越，正出之际，忽为风寒所触，出必复收，已收之后，若不避忌，留毒难尽，变证无穷，轻者证延日
久，咳嗽与痰疾，终身不愈，重者必变危证，宜始终谨避为妥。
疹本火候，自发热至出透之日，未免有口渴烦躁，故多喜食冷物，然食冷虽曰无妨，而生冷始终当忌，即使
透表之后，只可以悉尼、莲藕、荸荠、柿饼略食，亦不可恣食，若桃、李、梅子、柑、橘、石榴、菱角，又在
所必忌。
小儿出疹，最嗜辛辣之味，与热汤水，盖疹属火候，火蕴于内，得辛辣热物，而痰火暂快，故多喜食，如
或因其酷饮，遂以胡椒、茱萸作汤，或醇酒、姜、蒜、韭、薤之类，与食而顺其欲，暂虽快畅，久则痰火益甚，
致疹变为紫黑色，或二便闭结，或成血痢肠头露出，或生牙疳，或唇舌破裂，或喉中痰响 ，或五窍出血，或
大热不止，致胃火益甚，而饮食即吐不能下者，种种恶候，因而生焉，食物既忌辛辣之味，药剂更忌辛辣之品，
又可知矣。
疹证，凡马、牛、猪、羊、鹅、鸭、鱼腥等味，盐、醋、甘、甜、面食、五辛、滞气煎 等物，必俟疹收后
四十九日之外，方可食用。惟宜食淡，庶无后患，否则食盐太早，令儿咳嗽；食五辛太早，能生惊热；食荤腥太
早，必生奇证，慎之慎之。
麻疹在尚未发出之前，一旦受到风寒侵袭，会导致小儿肌肤干燥，腠理（皮肤纹理及汗孔）闭塞致密，致使疹毒无法透发。在疹子正要发出的关键时刻，忽然被风寒触动，疹子刚出来就会重新隐没。疹子已经收没之后，如果不注意避忌，残留的毒邪难以清除干净，变证无穷无尽。轻者病程拖延日久，出现咳嗽和痰疾，终身不愈；重者必然转变为危重证候，因此始终谨慎避开风寒才是妥当的做法。
麻疹本质属于火邪为患，从发热到疹子完全透出期间，难免会出现口渴、烦躁的症状，所以患儿大多喜欢吃冷食。然而，虽然吃冷食看似无妨，但生冷食物始终应当禁忌。即使疹子已经完全透发之后，也只可以少量食用荸荠、莲藕、柿饼等凉性食物，也不可以放纵贪吃。至于桃子、李子、梅子、柑橘、石榴、菱角等水果，更是必须禁忌的。
小儿出疹时，最嗜好辛辣的味道以及热汤热水，这是因为疹子属于火邪，火热蕴结于体内，遇到辛辣热物时，痰火症状会暂时得到舒缓，所以患儿多喜欢食用。如果因为孩子酷爱饮用，就用胡椒、吴茱萸煮汤，或者提供醇酒、姜、蒜、韭菜、小根蒜之类，顺从其欲望给予食用，虽然暂时感到畅快，但久而久之会使痰火更加严重，导致疹色变为紫黑色，或者大小便闭结不通，或者形成血痢且直肠脱出，或者发生牙疳，或者嘴唇舌头破裂，或者喉中痰鸣音响，或者五官七窍出血，或者高热不止，导致胃火更加旺盛，饮食即吐无法下咽。种种恶候由此产生。既然食物需要禁忌辛辣味道，那么药剂更应禁忌辛辣之品，这也就可想而知了。
对于麻疹证候，凡是马肉、牛肉、猪肉、羊肉、鹅肉、鸭肉、鱼腥等肉类，以及盐、醋、甘味、甜味、面食、五辛（指葱、蒜、韭、薤、兴渠五种辛香蔬菜）、滞气煎炸等食物，必须等到疹子完全收没四十九天之后，才可以食用。只适宜吃清淡的食物，这样才没有后患。否则，食盐吃得过早，会导致小儿咳嗽；五辛吃得过早，能引发惊风发热；荤腥吃得过早，必然产生奇异的变证，务必谨慎再谨慎。
Before the measles rash has not yet erupted, if exposed to wind-cold, it causes the child's skin to become dry and the couli (skin pores and interstices) to close tightly. Consequently, the measles toxin cannot be vented outward. At the critical moment when the rash is about to emerge, if suddenly touched by wind-cold, the rash that has just appeared will retract. After the rash has retracted, if precautions are not observed, the residual toxins will be difficult to clear completely, leading to infinite variations of symptoms. In mild cases, the disease lingers for a long time, resulting in chronic cough and phlegm disorders that may never heal throughout life; in severe cases, it inevitably transforms into critical conditions. Therefore, it is advisable to strictly avoid wind-cold throughout the entire course.
Measles essentially involves fire-heat pathogenic factors. From the onset of fever until the day the rash fully erupts, thirst and irritability are inevitable, so children often crave cold foods. However, although consuming cold foods seems harmless, raw and cold foods must always be avoided. Even after the rash has fully emerged on the exterior, only small amounts of cooling foods such as Dioscorea esculenta (Chinese yam), Nelumbinis Rhizoma (Lotus Root), and Dioscorea opposita (Water Chestnut) or dried persimmons can be consumed, and one must not indulge. Fruits such as peaches, plums, mume fruits, citrus fruits, pomegranates, and water caltrops are strictly contraindicated.
Children with measles have a strong preference for spicy flavors and hot soups or water. This is because measles belongs to fire-heat pathogens; when fire-heat is trapped internally, spicy and hot foods temporarily relieve the sensation of phlegm-fire, hence the craving. If, due to their intense desire, parents provide decoctions made of Piperis Fructus (Black Pepper) and Cornus Officinalis Fruit (Cornelian Cherry), or offer strong wine, ginger, garlic, leeks, and Allium tuberosum var. ramosum (Chinese Chives/Leeks), indulging their desires, they may feel temporarily comfortable. However, over time, this exacerbates phlegm-fire, causing the rash to turn purple-black, or leading to constipation of both bowels and urine, or bloody dysentery with rectal prolapse, or dental gangrene, or cracking of lips and tongue, or rattling phlegm in the throat, or bleeding from the five orifices, or unceasing high fever. This intensifies stomach-fire, causing vomiting immediately after eating and inability to retain food. Various ominous signs arise from these causes. Since dietary intake must avoid spicy flavors, it goes without saying that medicinal prescriptions must also avoid spicy ingredients.
Regarding measles syndromes, meats such as horse, cattle, pig, sheep, goose, duck, and fishy-flavored items, as well as salt, vinegar, sweet substances, wheat-based noodles, the "Five Pungents" (Wuxin: typically referring to pungent vegetables like scallion, garlic, chive, etc.), and gas-stagnating fried foods, must not be consumed until forty-nine days after the measles rash has completely receded. A bland diet is preferred to prevent future complications. Otherwise, consuming salt too early induces coughing; consuming the Five Pungents too early generates convulsions and heat; consuming meat and fish too early inevitably produces strange pathological changes. One must exercise extreme caution.