The point that hurts

The name comes from chapter 29 of the Qianjin Yaofang (Essential Prescriptions Worth a Thousand Gold), the first of the two that Sun Simiao devotes to acupuncture and moxibustion: «有阿是之法，言人有病痛，即令捏其上，若裡當其處，不問孔穴，即得便快成痛處，即云阿是。灸刺皆驗，故曰︰阿是穴也». There is a method called Ashi: when someone has pain, you press on it, and if you hit the exact spot, whether or not it is a named point, the patient feels relief or pain and exclaims “a shi!”, something like “there, that's it!” Moxa and needle work just the same at that spot, which is why it is called the Ashi point.

The context is curious. The sentence comes right after advice for officials posted to the damp lands of the south, Wu and Shu: always keep two or three open moxa sores on the body so that fevers and miasmas do not take hold. It is a passage about practical, travel moxibustion, and the Ashi point appears in it as a resource of the same kind: no map, just the hand.

The idea is much older than the name. The Jing Jin (經筋) chapter of the Lingshu, the one on the sinew channels, repeats the same treatment formula twelve times, once per channel: «治在燔鍼劫刺，以知為數，以痛為輸». Treat with the heated needle, piercing and withdrawing quickly; the number of sessions is set by the effect, and the point is the place that hurts. For contractures and tendon pain, the Lingshu gives no point names: it gives a rule.

The Bei Shu (背腧) chapter of the Lingshu lists the back points of the five Zang organs, counting vertebrae: the Lung's at the third, the Heart's at the fifth, the diaphragm's at the seventh, the Liver's at the ninth, the Spleen's at the eleventh, and the Kidney's at the fourteenth. But it does not rely on the count alone. It adds how to check the location: «按其處，應在中而痛解，乃其俞也». When you press, the response is felt deep inside and the pain eases; that is the point.

The same chapter has a rule that is surprising today: «灸之則可，刺之則不可». At these points moxa may be applied, but not needling. They are BL13, BL15, BL17, BL18, BL20, and BL23, and above them all, the great Shu point of the chest at the end of the vertebra, BL11.

One point on the back takes its name from the same search. In the Gu Kong Lun chapter of the Suwen (Basic Questions), BL45, Yixi, is located this way: «厭之令病者呼譩譆，譩譆應手». Press until the patient groans, “yi xi!”, and the point responds under the hand. The point's name is the patient's sound: Sun Simiao's Ashi, centuries earlier, with a name of its own.

Today the Ashi point is often compared to the trigger points of Western medicine, the painful nodules in muscles. The comparison is modern and debated, and it appears in no classical text. What the classics do make clear is that, for them, a point was not just a coordinate: it was a place recognized by touch.