LI-03 (San Jian) Third Space

What does LI-03 San Jian do?

LI-03 is the Shu-Stream and Wood point of the Large Intestine channel, and its recorded actions follow that position: it clears heat from the head and face along the channel’s course, and it moves fullness in the abdomen. The Large Intestine is a yang Metal channel, so Wood on it is the point that Metal controls — which means LI-03 is none of the three roles readers usually look for.

• Expels wind and heat — the channel’s exterior-releasing function at a distal point
• Clears heat and benefits the throat and teeth — the Yang Ming channel reaches the face, jaw and teeth, which is why a point on the index finger treats them
• Dispels fullness and treats diarrhoea — the organ-level action, unusual for a distal point and worth noting

Working the five-shu roles out from the elements, using this site’s own element records for the channel: LI-01 Shang Yang is Metal, LI-02 Er Jian is Water, LI-03 is Wood, LI-05 Yang Xi is Fire, LI-11 Qu Chi is Earth. Large Intestine is yang Metal. Metal’s mother is Earth, so the tonification point is LI-11; Metal’s child is Water, so the sedation point is LI-02; the horary point is the Metal point, LI-01. Wood is the element Metal controls, so LI-03 is the controlling-element point — the same case as HT-03 Shao Hai on the Heart channel and SI-02 Qian Gu on the Small Intestine.

One more classification point: on yang channels the Yuan-Source point is a separate point from the Shu-Stream, unlike yin channels where the two coincide. So LI-03 is the Shu-Stream while LI-04 He Gu is the Yuan-Source — two different points with two different jobs.

Source: Sacred Lotus sources & references (channel, element and action records; the Large Intestine five-shu series and LI-04's Yuan classification queried from our own data), cross-referenced against multiple online sources.

What is LI-03 San Jian used for?

LI-03 is used for heat conditions of the face, mouth and throat, and for swelling and pain of the hand itself. Our own indication record is reproduced here in full.

• Toothache
• Eye pain
• Sore throat
• Redness and swelling of the fingers and the back of the hand
• Abdominal fullness and diarrhoea — from the organ-level action recorded above

Why a point on the index finger treats the teeth. The Large Intestine channel runs from the index finger up the arm, across the shoulder and neck, and terminates beside the nose, passing through the lower jaw and teeth on the way. Distal points on a channel are classically used for its far end, and the Yang Ming channels are the ones associated with the face and mouth. This is the same logic that makes LI-04 He Gu one of the Four Commands for the face and mouth.

How it sits among its neighbours. LI-02 Er Jian is the Ying-Spring and Water point just distal to it, more strongly heat-clearing; LI-04 He Gu is the Yuan-Source point just proximal, far more widely used; LI-05 Yang Xi is the Jing-River and Fire point at the wrist; LI-11 Qu Chi is the He-Sea point at the elbow and the channel’s principal heat-clearing point. All four are held here.

Source: Sacred Lotus sources & references (indication record; neighbouring-point classifications queried from our own data), cross-referenced against multiple online sources.

Where is LI-03 San Jian located?

LI-03 lies on the thumb side of the index finger, in the hollow just behind the head of the second metacarpal bone. With a loose fist the point falls into a distinct depression proximal to the knuckle — one of the more reliably palpable points on the hand, unlike points located purely by measurement.

• Proximal to the second metacarpal head, on the radial (thumb) side
• Distal to LI-04 He Gu, which sits between the first and second metacarpals
• Proximal to LI-02 Er Jian, which is at the finger’s own joint

On the name. “San Jian” means Third Space or Third Interval — it is the third point on the channel, counted from LI-01 at the corner of the index fingernail. Its neighbour LI-02 is “Er Jian”, Second Space, by the same counting. The names are positional rather than descriptive of function, which is worth knowing because it means the name carries no clinical information.

Source: Sacred Lotus sources & references (location record, retained unchanged), cross-referenced against multiple online sources.

• A Manual of Acupuncture (p. 102): On the radial side of the index finger, in the substantial depression proximal to the head of the second metacarpal bone.
• Chinese Acupuncture and Moxibustion (p. 140): When a loose list is made, the point is on the radial side of the index finger, in the depression proximal to the head of the second metacarpal bone.

How is LI-03 San Jian needled?

The standard texts record perpendicular insertion to roughly 0.5–0.8 inch, with moxibustion applicable. What follows is a neutral record of what the reference literature documents, not instruction for a reader.

• Angle and depth as recorded: perpendicular, 0.5–0.8 inch.
• Moxibustion: recorded as applicable.
• Regional anatomy: the first dorsal interosseous muscle lies deep to the point; the dorsal digital branches of the radial nerve and the dorsal venous network of the hand are superficial to it.

Hazard, stated proportionately. This is a low-hazard point. There is no body cavity, major vessel or large nerve trunk in the needle’s recorded path, and the depth recorded is shallow. Saying so plainly is more useful than attaching a generic caution: the points in this library that carry real hazards — over the thorax, the orbit, the great vessels of the neck, or the deep gluteal region — are documented with measured anatomy, and LI-03 is not among them. No case report naming LI-03 as the site of an injury was located, and none is asserted.

Source: Sacred Lotus sources & references (needling record, retained unchanged), cross-referenced against multiple online sources; regional anatomy from standard anatomical description.

Is there research on LI-03 San Jian?

No. A search returns twenty-eight records, and not one of them is about this point. That is the honest answer, and the search itself is a useful illustration of why point-code results have to be read rather than counted.

Retrieving and reading the results returned for “San Jian” and “LI 3”:

• A case report on Meige syndrome (PMID 41074516) — does not concern this point
• A randomised trial of dynamic qi acupuncture for acute lumbar sprain (PMID 36484189) — does not concern this point
• A study of shoulder explosive force in healthy women (PMID 33343681) — does not concern this point
• An anatomical study of LI-4 Hegu and the radial nerve (PMID 31341499) — a different point, returned by the code search
• A literature review on radiation-induced xerostomia (PMID 26311288) — does not concern this point

None is retracted; all resolve; and none supports a claim about LI-03. The point’s standing rests entirely on the classical record and on its position in the five-shu system, not on modern evidence. A page that implied otherwise by listing these citations would be misleading precisely because each one is a real, resolvable paper.

What this means for a reader. LI-03 is a minor point that is genuinely used — it appears in classical prescriptions for toothache and throat conditions — but the attention of modern research has gone to its neighbour LI-04 He Gu, which is among the most-studied points in the world. Where the two are used together, evidence about the combination is not evidence about LI-03.

Source: PubMed (search results retrieved and each record read individually; PMID 41074516, 36484189, 33343681, 31341499, 26311288 checked and none retracted), and Sacred Lotus sources & references for the classification record.