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Tremor and shaking (Chanzhen), characterized by the involuntary trembling of the hands and feet, is a disease of the Liver (Gan), an image of Wind (Feng), which also affects the Spleen (Pi). The Liver corresponds to Wood (Mu); Wood governs Wind. Wind belongs to Yang (Yang), and Yang governs movement. The Spleen corresponds to Earth (Tu); Earth governs the four limbs, and the four limbs receive Qi from the Spleen. When Earth Qi is insufficient and Wood Qi agitates it, tremors and shaking occur. This is what is referred to as "Wind Yin Mo Ji" (diseases of the extremities caused by excessive Wind).

Note: The hands and feet are the root of all Yang meridians. When Yang Qi is insufficient, the four limbs cannot move autonomously, allowing Liver Wind to invade. The Liver corresponds to Wood; extreme heat generates Wind. When Yin Blood declines, internal heat arises, which in turn generates Wind. Therefore, those who suffer from this condition are often elderly individuals with deficiency of both Qi and Blood. It is common for such cases, but treatment is extremely difficult to achieve success.

The *Neijing* (Huangdi Neijing) states: "When Summerheat prevails, the earth becomes hot; when Wind prevails, the earth shakes; when Dampness prevails, the earth becomes muddy; when Cold prevails, the earth cracks." Although the Qi of Cold, Summerheat, Wind, and Dampness originates from Heaven, they all penetrate into the Earth. Since humans walk upon the ground, they often suffer from their toxicity. Hong Kong Jiao (Hongjiaojiao, commonly known as Beriberi or gouty arthritis in ancient contexts, here referring to a specific lower limb disorder) begins in the feet, gradually spreading to the lower abdomen, and in severe cases, attacks upward toward the heart and chest. If not treated urgently, it can be fatal. Moreover, the meridians of the Zang-Fu organs, specifically the Spleen, Liver, and Kidney, ascend from the toes into the abdomen. Thus, manifestations of Hong Kong Jiao may include vomiting and aversion to food, abdominal pain with difficulty in defecation, blockage of urination and defecation, palpitations and fright in the chest, aversion to light, mental confusion, delirium, and forgetfulness, headache with high fever, cold pain in the body, frequent muscle spasms, insensitivity in the lower abdomen, stubborn numbness in the thighs and calves, cramping and urgency in all joints, or flaccidity and inability to move freely. Symptoms vary widely. Since these ailments originate from the feet, they are collectively termed Hong Kong Jiao. There are further distinctions between Dry and Wet types.

Dry Hong Kong Jiao presents with obstructed and sluggish blood vessels, numbness and anesthesia of the skin, thin and sore calves, reduced appetite and emaciation, constipation and stagnation in the Zang-Fu organs, and upward rushing causing irritability and oppression. Wet Hong Kong Jiao presents with initial swelling and fullness of the feet, or sores forming below due to downward flow, oozing fluid, or upward attack on the heart and abdomen causing coughing and rapid breathing, facial edema, knee swelling, and vomiting upon seeing food. These diseases differ, likely due to divisions in Yin-Yang constitutions and organ involvement, but both are caused by Wind-Toxicity and Dampness. Treatment must be tailored according to the specific location and nature of the symptoms.