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Hong Kong Foot (a disease characterized by swelling and pain in the feet) presenting with distension and fullness gradually turning into edema indicates that pathogenic factors are attacking upward to the Spleen and Kidney. The Spleen corresponds to the Qi of Earth, and the Kidney corresponds to the Qi of Water. Hong Kong Foot is a disease caused by clear dampness; its pathogenic Qi easily affects the Spleen and Kidney, following the principle of "like attracting like" (Tong Qi Xiang Qiu). When the Spleen is affected by pathogens, dampness fails to transform; when the Kidney is affected, water Qi fails to vaporize. The combination of water and dampness pathogens internally and externally accumulates to cause fullness and obstruction to cause distension.

Chiling Tang (Red Poria Decoction)
Ingredients: Chifuling (Polyporus Umbellatus), Fangji (Stephaniae Tetrandrae Radix), Sangbaipi (Mori Cortex), Chenpi (Citri Reticulatae Pericarpium) [1.5 liang each]; Xuanfu (Inulae Flos) [5 qian]; Xingren (Armeniacae Semen Amarum); Mahuang (Ephedrae Herba, removed roots and joints); Baizhu (Atractylodis Macrocephalae Rhizoma); Zisu (Perillae Folium) [1 liang each].
Preparation and Administration: Boil 1.5 bowls of black bean decoction, take 5 qian of the herbs, add 0.5 fen of fresh ginger, and decoct for administration.

After Hong Kong Foot has healed, if pathogenic factors are not fully eliminated and healthy Qi has not recovered, encountering anger or being affected by wind-dampness may cause recurrence. The symptoms often resemble previous episodes, but previous treatment methods usually fail. Treatment must be based on seasonal changes and an assessment of the patient's constitution.

Sijin Wan (Four-Jin Pill)
Indicated for chronic use after recovery from dry or wet Hong Kong Foot to prevent recurrence permanently.
Ingredients: Niuxi (Achyranthis Bidentatae Radix), Mugua (Chaenomelis Fructus), Roucongrong (Cistanches Herba), Tianma (Gastrodiae Rhizoma) [1 jin each].
Preparation and Administration: Soak in 5 sheng of wine for one day, dry, and grind into powder. Use the soaked wine reduced to a paste to bind the powder into pills the size of wutong seeds. Take 30 pills with wine.

The *Neijing* states that wind, cold, and dampness mixing together cause Bi Syndrome (Obstruction Syndrome). When wind predominates, it is called Xing Bi (Wandering Bi); when cold predominates, it is called Tong Bi (Painful Bi); when dampness predominates, it is called Zhuo Bi (Fixed Bi). Xing Bi is characterized by wandering pain, commonly known as migrating pain. Tong Bi is characterized by severe pain, commonly known as gouty pain. Zhuo Bi is characterized by fixed heaviness and numbness, commonly known as insensibility. "Bi" means obstruction; when the healthy Qi of the five zang and six fu organs is obstructed by pathogens, numbness and loss of sensation occur.

The *Neijing* also discusses five types of Bi: Gu Bi (Bone Bi), Jin Bi (Sinew Bi), Mai Bi (Vessel Bi), Ji Bi (Muscle Bi), and Pi Bi (Skin Bi). Generally, the three Bi syndromes caused by wind, cold, and dampness are named according to the season of onset and the location of the pathogens; this does not imply that Bone, Sinew, Vessel, Muscle, and Skin Bi exist separately outside of Wandering, Painful, and Fixed Bi.

When wind, cold, and dampness invade the meridians and enter the bones, movement becomes heavy and difficult; entering vessels causes blood stagnation; entering sinews causes inability to flex and extend; entering muscles causes numbness; entering skin causes coldness. If prolonged, the pathogens enter the five zang organs. Distension, wheezing, and vomiting indicate Lung Bi; rising Qi, dry throat, cold limbs, and abdominal distension indicate Heart Bi; excessive thirst, frequent urination, and night terrors indicate Liver Bi; walking on the coccyx instead of heels and spinal curvature indicating head position indicates Kidney Bi; limb flaccidity, coughing, and frothy sputum indicate Spleen Bi. Generally, the appearance of zang organ symptoms indicates a difficult-to-treat condition.