小儿之病，古人谓之哑科，以其言语不能通，病情不易测。故曰∶宁治十男子，莫治一妇人；
宁治十妇人，莫治一小儿。此甚言小儿之难也。然以余较之，则三者之中，又为小儿为最易。何以
见之？盖小儿之病非外感风寒，则内伤饮食，以至惊风吐泻，及寒热疳痫之类，不过数种，且其脏
气清灵，随拨随应，但能确得其本而撮取之，则一药可愈，非若男妇损伤，积痼痴顽者之比，余故
谓其易也。第人谓其难，谓其难辨也；余谓其易，谓其易治也，设或辨之不真，则诚然难矣。然辨
之之法，亦不过辨其表里、寒热、虚实，六者洞然，又何难治之有？故凡外感者，必有表证而无里
证，如发热、头痛、拘急、无汗，或因风搐搦之类是也；内伤者，止有里证而无表证，如吐泻、腹
痛、胀满、惊疳、积聚之类是也；热者必有热证，如热渴、躁烦、秘结、痈疡之类是也；寒者必有
寒证，如清冷吐泻，无热无烦，恶心喜热者是也，凡此四者，即表里寒热之证，极易辨也。然于四
者之中，尤惟虚实二字最为紧要，盖有形色之虚实，有声音之虚实，有脉息之虚实，如体质强盛与
柔弱者有异也，形色红赤与青白者有异也，声音雄壮与短怯者有异也，脉息滑实与虚细者有异也，
故必内察其脉候，外观其形气，中审其病情，参此数者而精察之，又何虚实之难辨哉。必其果有实
邪，果有火证，则不得不为治标，然治标之法，宜精简轻锐，适当其可，及病则已，毫毋犯其正气，斯为高手
但见虚象，便不可妄行攻击，任意消
耗。若见之不真，不可谓姑去其邪，谅亦无害，不知小儿以柔嫩之体，气血未坚，脏腑甚脆，略受
伤残，萎谢极易，一剂之谬尚不能堪，而况其甚乎。矧以方生之气，不思培植而但知剥削，近则为
目下之害，远则遗终身之羸，良可叹也。凡此者，实求本之道，诚幼科最要之肯綮，虽言之若无奇
异，而何知者之茫然也。故余于篇端，首以为言，然非有察察之见者，固不足以语此，此其所以不
易也。
阴阳应象大论曰∶善诊者，察色按脉，先别阴阳。审清浊而知部分，视喘息、听声音而知所苦
，观权衡规矩而知病所主。按此论虽通言诊法之要，然尤于小儿为最切也。
小儿的疾病，古人称为“哑科”，因为患儿无法用言语表达，病情难以推测。所以说：“宁可诊治十个男子，也不诊治一个妇人；宁可诊治十个妇人，也不诊治一个小儿。”这是极度强调小儿疾病难治的说法。然而，依我比较来看，在这三者之中，小儿病其实是最容易治疗的。凭什么这样说呢？因为小儿的病因不外乎外感风寒，或者内伤饮食，以及惊风、吐泻，还有寒热、疳积、癫痫之类，不过只有几种病症。而且小儿脏腑之气清灵纯净，治疗时只要拨动一下就能迅速响应（指疗效快）。只要能够确切地找到疾病的根本并抓住关键进行治疗，往往一服药就能痊愈，这不像成年男女那样有外伤损伤或久积成痼的顽固痴顽之症相比，所以我称其为易治。只是人们说它难，是指病情难以辨别；我说它易，是指容易治疗。如果辨证不真切，那确实就难了。然而辨证的方法，也不过是辨别表里、寒热、虚实这六个方面，只要对这六者了然于胸，又有什么难治的呢？所以凡是外感病，一定表现为表证而没有里证，如发热、头痛、肢体拘急、无汗，或因风邪引起的抽搐等就是这类；内伤病，只表现为里证而没有表证，如吐泻、腹痛、胀满、惊疳、积聚等就是这类；热证一定伴有热象，如口渴喜饮、烦躁不安、大便秘结、痈肿疮疡等就是这类；寒证一定伴有寒象，如呕吐泄泻清冷、无发热无烦躁、恶心且喜欢温热食物等就是这类。以上这四种情况，即表、里、寒、热的证候，是非常容易辨别的。然而在这四者之中，尤其以“虚”和“实”两个字最为紧要。因为有形体色泽上的虚实，有声音上的虚实，有脉象上的虚实。例如体质强盛与柔弱的不同，面色红赤与青白的不同，声音洪亮与短促怯弱的不同，脉象滑实与虚细的不同等。因此必须向内诊察脉候，向外观察形气，中间审察病情，综合这几方面进行精细考察，那么虚实又怎么会难以辨别呢？如果确实存在实邪，确实有火证，则不得不采取治标的方法。然而治标的方法，应当精简、轻灵、锐利，恰到好处，一旦病愈就停止，丝毫不要损伤正气，这才是高明的医生。只要见到虚象，就不可以妄行攻伐，任意消耗正气。如果看得不真切，不能借口说是暂时去除邪气，想必也不会造成伤害。不知道小儿身体柔嫩，气血尚未坚固，脏腑非常脆弱，稍微受到伤残，就会像草木枯萎一样容易衰败。一剂药的错误尚且难以承受，何况更严重的误治呢？况且面对初生之气，不思培育保养却只知道剥削消耗，近处造成当下的危害，远处遗留终身的瘦弱，实在令人叹息。凡此种种，实际上是探求疾病根本的道理，确实是儿科最关键的要点，虽然说得似乎没有奇异之处，但为什么懂行的人却茫然无知呢？所以我在这篇开头首先提出这个观点，然而如果没有明察秋毫的见识，本来就不足以谈论这个问题，这就是之所以说不易的原因。
《素问·阴阳应象大论》说：“善于诊断的医生，通过观察面色和按摸脉象，首先辨别阴阳。审视清浊来知道病变的部位，观察呼吸喘息、听声音来知道病人的痛苦所在，观察权衡规矩（指脉象的变化规律）来知道疾病的主因。”按照这篇论述，虽然通篇讲的是诊断方法的要领，但对于小儿来说尤为切合。
The diseases of children were called "Mute Department" (Ya Ke, a term referring to pediatrics where patients cannot verbalize symptoms) by ancient people because they cannot communicate verbally, making the condition difficult to assess. Thus it is said: "It is better to treat ten men than one woman; it is better to treat ten women than one child." This is an extreme statement emphasizing the difficulty of treating pediatric cases. However, in my comparison, among these three groups, pediatric cases are actually the easiest to treat. Why do I say so? Because the etiology of children's diseases is either external contraction of wind-cold or internal injury from diet, leading to conditions such as convulsions due to fright, vomiting and diarrhea, as well as cold-heat disorders, malnutrition (Gan syndrome), and epilepsy. These are merely a few types. Moreover, the vital energy of children's zang-fu organs is pure and agile; they respond immediately upon intervention. If one can accurately identify the root cause and grasp the key points of treatment, a single prescription can cure the disease. This is not comparable to adult men and women who suffer from physical trauma or chronic, stubborn, and entrenched illnesses. Therefore, I consider them easy to treat. People claim it is difficult because they find differentiation hard; I claim it is easy because I find treatment straightforward. If differentiation is not precise, then indeed it is difficult. However, the method of differentiation involves nothing more than distinguishing between exterior and interior, cold and heat, and deficiency and excess. Once these six aspects are clearly understood, what difficulty remains in treatment? Therefore, for any external contraction, there must be exterior signs without interior signs, such as fever, headache, stiffness and spasm, absence of sweating, or convulsions induced by wind. For internal injuries, there are only interior signs without exterior signs, such as vomiting and diarrhea, abdominal pain, distension and fullness, fright and malnutrition, and accumulations and masses. Heat patterns must present with heat signs, such as thirst and desire for drinks, restlessness and irritability, constipation, and carbuncles and sores. Cold patterns must present with cold signs, such as clear and cold vomiting and diarrhea, absence of fever and irritability, nausea, and preference for warmth. These four categories—exterior, interior, cold, and heat—are extremely easy to differentiate. Among these four, however, the concepts of deficiency (Xu) and excess (Shi) are particularly crucial. There are deficiencies and excesses in physical appearance, in voice, and in pulse. For instance, constitution differs between robust and frail individuals; complexion differs between ruddy/red and cyanotic/pale; voice differs between strong/resonant and short/timid; pulse differs between slippery/solid and deficient/thin. Therefore, one must internally examine the pulse, externally observe the form and qi, and centrally assess the clinical condition, synthesizing these factors for meticulous observation. How could deficiency and excess then be difficult to distinguish? If there is truly an excess pathogen or fire pattern, it is imperative to treat the branch (symptoms). However, methods for treating the branch should be concise, light, and sharp, applied appropriately, and discontinued once the illness resolves, without harming the healthy qi (Zheng Qi). This constitutes the skill of a master physician. Whenever deficiency signs are observed, one must not recklessly employ attacking methods or arbitrarily deplete the body. If the observation is inaccurate, one cannot justify it by saying that temporarily removing the pathogen will surely cause no harm. One must realize that children have tender bodies, unconsolidated qi and blood, and fragile zang-fu organs. Slight injury can lead to rapid decline, like withering plants. Even a single erroneous prescription is intolerable, let alone severe mismanagement. Furthermore, regarding the nascent vital energy, if one fails to nurture and cultivate it but instead knows only how to exploit and deplete it, the immediate result is current harm, and the distant consequence is lifelong emaciation and weakness, which is truly lamentable. All these points represent the true way of seeking the root cause. They are indeed the most critical keys in pediatrics. Although stated seemingly without anything extraordinary, why do knowledgeable practitioners remain oblivious? Therefore, I introduce this topic at the beginning of this chapter. However, those without perceptive insight are certainly unfit to discuss this matter, which is precisely why it is considered not easy.
The *Treatise on the Correspondence of Yin and Yang* states: "A skilled diagnostician observes the complexion and palpates the pulse, first distinguishing yin and yang. By examining clarity and turbidity, one knows the location of the pathology; by observing respiration and listening to the voice, one understands the patient's suffering; by assessing the balance and regularity (referring to pulse qualities), one identifies the governing factor of the disease." Although this discourse generally outlines the essentials of diagnostic methods, it is particularly applicable to pediatric cases.