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Ancient texts state: "Bian" (Change) refers to the transformation and generation of the Five Zang Organs; "Zheng" (Steaming/Heat) refers to the warming and nourishment of the Six Fu Organs. In mild cases, it manifests as low-grade fever resembling convulsions; in severe cases, it presents as high fever with irritability. A "Bian" occurs every 32 days, and a "Zheng" occurs every 64 days. This process concludes at 576 days, after which the child is considered fully grown. This theory seems to imply that children must undergo "Bian Zheng" from infancy to adulthood, and thus symptoms like low-grade fever resembling convulsions or high fever with irritability are not pathological but natural phenomena. However, this view cannot be entirely accepted. Upon examination, if a child is properly cared for and grows up without illness, natural fever typically occurs only during teething. Each episode of teething is accompanied by fever, which subsides naturally once the teeth erupt. This is likely the origin of the "Bian Zheng" theory. Furthermore, the human body possesses innate resistance to disease, and children are no exception. Often, due to improper living habits or irregular diet, a child may contract a minor ailment and subsequently develop a fever. Later, through their own immune resistance, the disease is eliminated invisibly. Thus, children often exhibit symptoms that appear ill but are not truly diseased, recovering suddenly shortly thereafter. This constitutes another explanation for the "Bian Zheng" theory. Based on these observations, the treatment for "Bian Zheng" should be adapted to these specific conditions. One must never neglect these signs, lest they cause future harm to the child.

1. Treatment for Teething Fever
Between the fourth and tenth months of age, a child's teeth gradually erupt. The first two teeth to emerge are usually the lower central incisors, followed by the pair of upper central incisors. If the upper central incisors erupt first, or if only one emerges, it is considered an abnormal phenomenon. The timing of eruption varies among individuals; some erupt teeth at four or five months, while others do not until ten months. Rarely, a child may be born with teeth, or may not erupt teeth until one year of age (occurring in one or two out of every hundred cases). The most common signs during teething include body fever, poor appetite, restlessness during sleep, frequent startles, and potentially diarrhea or vomiting. At this time, one can observe slight swelling or edema of the gums, with white tooth tips gradually appearing, confirming the diagnosis of teething. When the teeth pierce the gum tissue, the rapid growth force causes a febrile state. Although fever itself is not a pathological sign, if it induces other ailments, standard treatments must not be applied rigidly. For instance, fever may slow digestion and disrupt gastric order, leading to vomiting; it may also disrupt intestinal order, leading to diarrhea. In such cases, appropriate cooling, antipyretic, and digestive-aiding preparations should be used. For children with strong constitutions, herbs for clearing heat, resolving phlegm, and purging fire are added; for those with weak constitutions, herbs for strengthening the Spleen, supporting Qi, and resolving stagnation are added. While the symptomatic treatment resembles that of general diseases, one must strictly avoid excessive use of bitter-cold, draining, or acrid-aromatic drugs, which could secretly deplete the child's vital growing energy. This is a crucial point to note during teething.

2. Treatment for Cold-Induced Fever
If a child develops unexplained fever not caused by internal injury, it is either due to cold invasion, wind damage, dampness accumulation, or heat accumulation. Treatment should be tailored to the specific syndrome. For fever with no sweating, a mild diaphoretic method is indicated; for fever with sweating, harmonization is indicated. For mild heat, light and clear exterior-resolving methods are used; for severe heat, cooling and antipyretic methods are employed. Whether the cause is cold, wind, dampness, or heat, modifications should be made within established protocols, using small dosages. This is because children's Zang-Fu organs are delicate and cannot tolerate heavy medication. If the medication targets the pathology correctly, physical strength recovers easily, and minor ailments will naturally subside. The principle that "bland remedies yield miraculous results" is most applicable here.