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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.