Treating the unaffected side when the disorder lies in the collaterals, and how this differs from opposing needling.
Su Wen (素问)General Principles of Needling
ENGLISH TRANSLATION
The English is translated from the Chinese vernacular. The original text and its pinyin sit beneath each sentence in smaller type; hide them whenever you prefer to read the translation alone.
When evil lodges in the body it first rests in skin and hair; if it stays and does not leave it enters the grandson vessels; staying there it enters the collaterals; staying there it enters the channels, connects inward with the five viscera and disperses into stomach and intestines.
When yin and yang are both affected the five viscera are injured; this is the order by which evil enters from skin and hair and reaches as far as the five viscera.
Therefore where evil lodges in the body and will not leave, use miao needling.
ORIGINAL故邪客于形而不去者,缪刺之。
gù xié kè yú xíng ér bù qù zhě,miù cì zhī。
When evil lodges in the channels, excess on the left produces illness on the right, excess on the right produces illness on the left; sometimes it shifts, so that pain on the left has not ceased while the right channel is already ill. In such cases use contralateral needling, and it must strike the channel, not the collaterals.
Miu Ci Lun sets out the method of needling the healthy side to treat the affected one when the disorder is in the collaterals rather than the main channels. It distinguishes this from ju ci, which applies the same principle when the pathogen is deeper, in the channels themselves.
The chapter matters for two reasons. It is the classical source of contralateral point selection, still used for shoulder and facial disorders, and it is one of the few places where the classical texts reason explicitly about why treating the opposite side should work.
ANNOTATION
Miao needling (缪刺): 缪 is pronounced miù, interlaced — bleeding the collaterals on the opposite side, left for right and right for left.
Grandson vessels (孙脉): the finest branches of the collaterals.
Contralateral needling (巨刺): needling the channel of the opposite side to regulate qi, as against miao needling.
COMMENTARY
The distinction between miao and contralateral needling is often blurred in practice. The real difference lies in whether the illness sits in the collaterals or in the channels, and in whether the method is bleeding or regulating qi. Only with this clear does “treat the left for the right” cease to be blind.