Hai Feng Teng (海风藤; Hǎi Fēng Téng; Latin: Piperis Kadsurae Caulis; English: kadsura pepper stem) is the dried stem of Piper kadsura (Choisy) Ohwi. In Chinese medicine it is a wind-damp-dispelling herb. It is acrid, bitter, and slightly warm, enters the Liver channel, and its core actions are to dispel wind-damp, unblock the channels, and stop bi pain. The teaching point is wind-cold-damp bi, limb and joint pain, and sinew spasm. It is not Luo Shi Teng. Star jasmine stem is bitter and slightly cold. It dispels wind, unblocks collaterals, cools the blood, and reduces swelling, and leans toward heat bi. It is not Qing Feng Teng. Orientvine is bitter, acrid, and neutral. It dispels wind-damp and unblocks channels. Nature and safety margin differ. A beach or garden vine is not the official piece. Yin deficiency with interior heat, and red swollen hot joint pain, are a poor match.
It is used most often for three patterns:
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Wind-cold-damp bi — limb and joint pain
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Sinew spasm — difficulty bending and stretching
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Numb limbs — cold-damp
The usual decoction dose is 6–12 g. Acrid, bitter, and slightly warm, it is not a daily “collateral kadsura tea.” Unblocking when there is no cold-damp assists heat.
When wind-cold-damp blocks the channels, cold joint pain and spasm are common. Hai Feng Teng is acrid, bitter, and slightly warm. It dispels, unblocks, and stops pain, which is why it appears in wind-cold-damp bi formulas. It warms and unblocks more than it cools. Red swollen hot pain and a red tongue get hotter if more is added.
Hai Feng Teng is not a catch-all collateral or pain stem. In heat bi or yin deficiency with interior heat, using it alone can warm, dry, and assist heat. Whether it belongs in a formula should be decided by a licensed Chinese medicine practitioner after pattern diagnosis.