ST-39 (Xia Ju Xu) Lower Great Hollow

What does ST-39 Xia Ju Xu do?

ST-39 moves Small Intestine qi and transforms stagnation, regulates and harmonises the intestines and clears damp-heat, and it activates the channel — and it is the LOWER HE-SEA POINT OF THE SMALL INTESTINE.

• Moves Small Intestine qi and transforms stagnation — the action stating its Lower He-Sea role outright
• Regulates and harmonises the intestines and clears damp-heat
• Activates the channel and alleviates pain — the local leg action

What a Lower He-Sea point is, and why one sits on the Stomach channel. The three yang fu organs of the arm — Large Intestine, Small Intestine and San Jiao — each have a Lower He-Sea point on the leg, where the classical texts hold their disorders are best treated. Three of the six Lower He-Sea points fall on the Stomach channel: ST-36 Zu San Li for the Stomach itself, ST-37 Shang Ju Xu for the Large Intestine, and ST-39 here for the Small Intestine. The other three are GB-34 (Gallbladder), BL-40 (Bladder) and BL-39 (San Jiao). That is why a point recorded for “Small Intestine qi” is on the leg and not the arm.

Our own data records this incompletely, and this page says so. Querying every category field in the table, only BL-39 carries a stored “Lower He-Sea” designation — ST-36, ST-37, ST-39, GB-34 and BL-40 do not, though all five are Lower He-Sea points classically. So our category data holds one of the six and omits the other five. This is a genuine gap, the same kind our DU-02 record found for the Back-Shu points (stored nowhere) and our ST-39 role here shows from the action text. It is disclosed rather than corrected, because the category field is an identity element and changing it is owner-gated. The classical fact stands regardless: ST-39 is the Small Intestine’s Lower He-Sea point.

On the name. “Xia Ju Xu” means Lower Great Hollow — and it names a pair: ST-37 Shang Ju Xu is the Upper Great Hollow, three cun above. Shang and xia, upper and lower, distinguish two points of one name on one channel — the same built-in disambiguation our GB-11 Tou Qiao Yin record documents for the tou/zu pairs.

Source: Sacred Lotus sources & references (channel, action, location and translation records; every category field queried for Lower He-Sea designations and only BL-39 found, and the DU-02, GB-11, ST-36 and ST-37 records checked, against our own data), cross-referenced against multiple online sources.

What is ST-39 Xia Ju Xu used for?

ST-39 is used for lower abdominal pain, back pain referring to the testis, mastitis, and numbness or paralysis of the leg. Our own indication record is reproduced here in full.

• Lower abdominal pain
• Backache referring to the testis
• Mastitis
• Numbness and paralysis of the lower extremities

The lower-abdominal entries are the Lower He-Sea role in action. A point that treats the Small Intestine, from a distance on the leg, would be expected to carry lower abdominal pain — the small intestine’s own territory — and it does. “Backache referring to the testis” is a classical description of pain along the lower abdominal and inguinal region, consistent with the same distribution. The leg entry is local to where the point sits.

Mastitis is the entry that looks out of place, and it is worth a word. A distal leg point carrying a breast indication is unusual, and the classical explanation runs through the Stomach channel, which passes through the breast region on the chest — our ST-15 and ST-16 records carry mastitis at the breast itself, and ST-39 is a distal point of the same channel. It is the channel connection, stated as the tradition’s account.

An honest note. MASTITIS REQUIRES MEDICAL ASSESSMENT AND OFTEN NEEDS ANTIBIOTICS, and any new breast lump or nipple change requires prompt assessment and must never be attributed to mastitis without examination — inflammatory breast cancer can resemble it. Lower abdominal pain that is severe, sudden or persistent requires assessment; its causes include surgical emergencies, and in a man testicular pain with abdominal pain can mean testicular torsion, a surgical emergency where hours matter. Leg weakness or paralysis requires urgent assessment. This record documents classical use only.

How it is combined. With ST-37 Shang Ju Xu above — the two Great Hollows, Lower He-Sea points of the Small and Large Intestines respectively — and ST-36 Zu San Li, the Stomach’s. With ST-40 Feng Long, the Luo-Connecting point, just lateral. With REN-04 Guan Yuan and SI points for the small-intestine indications. All held here.

Source: Sacred Lotus sources & references (indication and action records; the REN-04, ST-15, ST-16, ST-36, ST-37 and ST-40 records queried from our own data), cross-referenced against multiple online sources.

Where is ST-39 Xia Ju Xu located?

ST-39 is on the outer lower leg, three cun below ST-37, a finger’s breadth from the shin bone’s front edge.

• 3 cun below ST-37 Shang Ju Xu
• One finger-breadth lateral to the anterior crest of the tibia — the shin bone’s sharp front edge
• ST-40 Feng Long lies at the same level, further lateral

The lower-leg Stomach points are laid out on one line, and their spacing is regular. ST-36 sits below the knee, ST-37 three cun below that, ST-39 three cun below ST-37 — even three-cun steps down the outer shin. The anterior tibial crest is the landmark for the whole line: it is subcutaneous and unmistakable, and each point sits a set distance lateral to it. No counting chain from a distant landmark is needed — the shin is its own ruler.

Our record uses a FINGER-BREADTH here, not a cun. That is a body-relative unit our GB-07 record also notes, used where a small lateral distance would be imprecise in cun. It is retained as stated rather than converted — the middle finger’s width is roughly one cun, but the record says finger-breadth and this page keeps it.

On the name. “Xia Ju Xu” — Lower Great Hollow, the lower of a pair with ST-37, as set out above.

Source: Sacred Lotus sources & references (location and translation records, retained unchanged including the finger-breadth measure; the GB-07, ST-36, ST-37 and ST-40 records queried from our own data).

• A Manual of Acupuncture (p. 164): On the lower leg, 3 cun inferior to Shangjuxu ST-37, one finger-breadth lateral to the anterior crest of the tibia.
• Chinese Acupuncture and Moxibustion (p. 155): 9 cun below Dubi (ST-35), and one finger breadth (middle finger) from the anterior border of the tibia.

How is ST-39 Xia Ju Xu needled?

Our own record states perpendicular insertion of 0.5–1.0 inch, with moxibustion applicable. What follows is a neutral record of what the reference literature documents. It is not instruction, and this page does not teach technique.

• Angle and depth as recorded: perpendicular, 0.5–1.0 inch.
• Moxibustion: recorded as applicable.
• Regional anatomy: tibialis anterior and extensor digitorum longus lie in the region; the deep fibular (peroneal) nerve and the anterior tibial artery run in the plane between them, deep to the muscle; the tibia lies medial and the fibula lateral.

Hazard, stated proportionately. There is no body cavity here, no pleura and no organ — the hazards this library documents on the trunk do not extend to the lower leg. The structure worth knowing is the deep fibular nerve and anterior tibial vessels running deep between the shin muscles, which the recorded depth stays clear of at a point sited in the muscle belly. Our record carries no explicit caution and this page does not invent one; only four points in the library carry an organ-injury caution, counted by query, none on a limb.

What is not claimed. No study measuring a safe depth at ST-39 could be located, and none is borrowed. Neither measured-depth study this library uses reaches the leg. No case report naming ST-39 was located.

Source: Sacred Lotus sources & references (needling record, retained unchanged; the four organ-injury cautions queried from our own data), cross-referenced against multiple online sources; regional anatomy from standard anatomical description.

Is there research on ST-39, and what should a reader know?

No trial isolates ST-39. Where the point appears it is one component of a digestive or leg protocol, and a study that includes a point in a protocol is not evidence about that point.

The neighbour with the reputation is ST-36 Zu San Li, one of the most-researched points in the world — and our ST-36 record is deliberately deflationary about it. Its Lower He-Sea sibling ST-37 has a colonic-motility literature. Evidence found near ST-39 usually belongs to those better-studied points, not to this one.

What this page can state with confidence. ST-39 is the Lower He-Sea point of the Small Intestine — its action “moves Small Intestine qi” states it, and it is one of three Lower He-Sea points on the Stomach channel with ST-36 and ST-37. Its lower-abdominal indications are that role in practice. And its name, Lower Great Hollow, pairs with ST-37 the Upper, the disambiguation built into the name.

A data-quality note, disclosed rather than fixed. Our category fields record the Lower He-Sea designation on BL-39 only — ST-36, ST-37, ST-39, GB-34 and BL-40 all carry it classically and none is marked. That is a genuine gap in our stored classifications, flagged here (as our DU-02 record flags the absent Back-Shu category) and left for owner decision, since the category field is an identity element.

A note on searching for it. “ST 39”, “S 39” and “Xiajuxu” searches return protocol trials and unrelated material — and note the near-identical ST-37 Shangjuxu, its paired point three cun up. Search on the code. Any claim attached to this point should be checked against what a study actually used.

Source: Sacred Lotus sources & references (action, indication, location and translation records; every category field queried for Lower He-Sea designations and the gap confirmed, and the ST-36 and ST-37 records checked, against our own data).