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Observing why Mount Tai is winding, it is because craftsmen follow nature; the sources of chaotic famous mountains and rivers form turbulent streams in sequence, swirling into the sea. There are natural laws within heaven and earth; even the most wise cannot create such transformative power. Medicine explores this discipline, where principles connect through a thousand sages. Among all specialties, "Xiaofangmai" (Pediatrics) stands out as the crucial topic of discussion.

Whenever conducting regulation, one must first judge what is appropriate; when studying medical chapters, one must initially examine difficult cases. Who knows the virtue of saving lives? I revere the medical way, understanding profound truths akin to immortals, with Yin and Yang clearly manifest, achieving success through practice. Alas! Receiving the master's profound teachings but failing to fully grasp the true essence; recognizing one's nature and comprehending the mechanism constitutes the utmost subtlety. Former scribes protected later learners with sincerity, having already described the origins, yet one must exhaustively seek the truth. Holding a lamp in the dark night, sighing at the long path of exploration; holding precious light in the morning, leaping forward bravely. Good physicians reflect upon themselves, like Han dynasty doctors dissecting difficult matters, merely stating their humble views. Eighteen chapters in total, hoping comrades will read them; how dare I comment? This is not madness or slander, but a detailed exposition of shallow words, surely expanding grand insights. From one corner, infer three others, expressing admiration again.

It is discussed that there is a distinction between favorable (Shun) and unfavorable (Ni) conditions; Yin and Yang are uneven, symptoms add up, and complexion and pulse become chaotic. Only during the onset of convulsive disorders (Jingfeng), by palpating the pulse and observing symptoms, can we compare them. If Yang syndrome, symptoms, and pulse all exhibit Yang characteristics, Yang indicates a favorable condition; if Yin syndrome, symptoms, and pulse all exhibit Yin characteristics, Yin indicates an unfavorable condition. When a Yang syndrome presents a Yin pulse, the disease tends to transmit; when a Yin syndrome presents a Yang pulse, the situation is reversed. For instance, acute convulsion (Ji Jingfeng) is a Yang epilepsy; a floating, rapid, full, and wiry pulse belongs to Yang within Yang, while a deep and slow pulse belongs to Yang containing Yin. Chronic convulsion (Man Jingfeng) is a Yin epilepsy; a deep, fine, slow, and weak pulse belongs to Yin within Yin, while a floating and large pulse belongs to Yin containing Yang. The so-called "unfavorable condition resembling favorable" refers to Yin containing Yang, where assisting Yang fails to restore consciousness, and restoring Yang fails to generate life. The condition is predominantly deficient; although Yin contains Yang, that Yang is not genuine. The pulse causes doubt, making attack inappropriate; one must reason carefully to understand, ceasing only after discerning what is feasible.

It is discussed that pediatric cold damage (Shanghan) should be treated by examining exterior and interior aspects, without insisting on finalizing Yin and Yang syndromes, because it relates not to the anterior and posterior pulses. The concept of "pure Yang child," generally speaking, refers to the Yin syndrome of chronic convulsion. Whenever infants suffer from vomiting and diarrhea leading to chronic convulsion, the symptoms show no reversal, mostly transmitted from acute convulsion, becoming Yin epilepsy. Using cold-cooling medicines drives the disease into slow spleen wind (Man Pi Feng); using dry-hot medicines results in symptoms reversing to Yang, meaning they follow Yang. The pulse becomes stronger, and the symptoms more adverse, hence termed "reversal." When both Yin and Yang are damaged, treatment is truly difficult. Physicians do not understand the cause; seeing only spasms, they recklessly apply heat-clearing and wind-stopping methods. After a long time, spasms cease, eyes close, phlegm accumulates, and the state becomes obscure like scattering seeds. With such symptoms, what pharmacological principle applies? Please attempt to compare.