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To treat wind pathogen invading the joints, causing severe pain in the four limbs, as if beaten by a hammer or forged, unbearable.
Fuzi (Prepared Aconiti Lateralis Radix, peeled and navel removed) Ganjiang (Prepared Zingiberis Rhizoma) Shaoyao Paeoniae Radix Fuling Poria Gancao (Honey-fried Glycyrrhizae Radix et Rhizoma) Guixin Cinnamomi Ramulus (each 3 liang) Baizhu Atractodis Rhizoma (4 liang) Renshen Ginseng Radix (3 liang)
The above are crushed into a coarse powder. Take 4 qian per dose, add 2 zhan of water, decoct until reduced to 7/10, strain off the dregs, and take before meals. Another prescription removes Guixin and uses Dihuang 2 liang.

This formula is most effective for treating Jiefeng (Joint Wind). It is widely used by modern practitioners with great efficacy. It also treats lower back and leg pain, as well as Hongkongjiao Liuzhu (Hong Kong Foot Flowing Accumulation) (See the Lower Back Pain section for the formula).

Wind, cold, summer-heat, and dampness, and Hongkongjiao differ in their onset (sudden vs. gradual) and depth (superficial vs. deep). Contracting wind, cold, summer-heat, and dampness results in sudden onset and superficial location; Hongkongjiao develops gradually and penetrates deeply, as it is triggered by the deficiency/excess and cold/heat of the Zang-Fu Qi, hence named after "Qi". The pathogen may follow the meridians into the Fu and Zang organs. Although the manifestations vary, San Yang (Three Yang) meridians often present with heat and restlessness, while San Yin (Three Yin) meridians often present with heat and vexation, which can be inferred analogously. However, Hongkongjiao is not exclusively caused by one type of pathogen, nor confined to a single meridian, thus differing from wind-cold-summerheat-dampness. Accompanying various subsequent diseases are mixed and complex, making differentiation difficult. Treatment requires identifying the meridian pathology and its location, then using pulse diagnosis to assess deficiency/excess and depth/shallowness to guide therapy. For example, in San Yang meridians, pulse diagnosis is often performed at the lateral malleolus and dorsum of the hand; in San Yin meridians, at the medial malleolus and inner arm. This rough distinction of Yin and Yang reveals the general picture. Regarding wind, cold, summer-heat, and dampness, their natures and effects differ: wind causes wandering pain, cold causes pain, summer-heat causes stubbornness, and dampness causes heaviness and sticking. These are established principles. The discussions in *Qianjin Fang* (Prescriptions Worth a Thousand Gold) and Dong's family tradition largely repeat old theories and seem unreliable. Only those who diligently study medicine will arrive at the most appropriate theories.

*Qianjin Fang* states that Hongkongjiao is caused by contracting wind toxin. It often goes unnoticed initially, only manifesting when triggered by other illnesses. One might suddenly feel extreme oppression and confusion, realizing the abnormality only after two or three days. Incompetent physicians, failing to recognize it, mistakenly treat it as trivial ailments, leading to death. Initially, symptoms are subtle; diet, play, and energy remain normal, except for weakness and difficulty flexing the legs upon sudden standing. Describing the appearance of wind toxin: some have no foot abnormalities but suffer from head, neck, arms, and shoulders; internal organs (heart, abdomen, five viscera) are distressed while external areas seem fine. Symptoms include vomiting upon seeing food or smelling odors, abdominal pain with diarrhea, constipation, chest palpitations and aversion to light, mental confusion and disordered speech, high fever and headache, body coldness with painful irritability, muscle cramps, swelling, numbness and bi-syndrome in the calves, flaccidity and loss of motor control, joint spasms, or numbness in the lower abdomen. All these are considered signs of Hongkongjiao. Even postpartum women exposed to cold often contract this toxin, presenting with heat, oppression, spasms, palpitations, vexation, vomiting, qi rebellion, cold stagnation below the umbilicus, depression, dysuria, and deviations from normal state—all are signs of Hongkongjiao. Flaccidity belongs to Huanfeng (Sluggish Wind), and pain belongs to Shibi (Damp-Bi). The excerpt from *Qianjin Fang* merely lists symptoms without specifying the affected Yin/Yang meridians, distinguishing between wind/damp/cold/heat pathogens, or explaining the role of Zang-Fu deficiency/excess. How should students treat it? Blindly trusting books is worse than having no books at all; this is what is meant.