Yao Yan Lumbar Eyes

What does Yao Yan do?

Yao Yan is an extra point on no channel, so it carries no channel-theory actions — everything recorded here is drawn from documented clinical use rather than from channel or organ mechanics. In that documented use it is a lumbar point: it exists for the lower back, and secondarily for urinary and menstrual complaints arising in the same region.

• Relieves lumbar pain and stiffness — the defining documented use, and the reason the point was recorded. It is used for low back pain, lumbar strain and stiffness of the lower back, and it is one of the standard local points of that region.
• Strengthens the lower back — recorded for weakness and aching of the lumbar region, including the long-standing, dull, worse-with-fatigue presentation.
• Addresses frequency of urination — carried in Sacred Lotus sources & references and across the reference literature.
• Addresses irregular menstruation — likewise recorded, alongside abnormal vaginal discharge in some sources.
• Recorded historically for taxation and consumptive disorders — the classical wasting and depletion category, in which the point appears in older texts.

A correction worth stating plainly. Yao Yan is very widely described as "tonifying the Kidneys", and our own earlier record carried that phrase. It has been removed. "Tonifies the Kidneys" is an organ-theory claim, and Yao Yan is on no channel — it has no five-shu, yuan, luo, back-shu or front-mu classification, and no channel connects it to the Kidney organ. The point that carries that function is BL-23 Shen Shu, the Back-Shu point of the Kidneys on the Bladder channel, held in Sacred Lotus sources & references. It is easy to see how the phrase attached itself — Yao Yan sits in the lumbar region the tradition associates with the Kidneys, and its documented uses (weak back, urinary frequency, menstrual irregularity) are the ones a practitioner would attribute to Kidney depletion. But what the sources document is the clinical use, not a channel mechanism, and the distinction matters on a site people cite.

Source: Sacred Lotus sources & references (existing action and indication record, corrected as described); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 572); Chinese Acupuncture & Moxibustion (pp. 247–248); cross-referenced against multiple online sources.

What is Yao Yan used for?

Yao Yan is used above all for pain and weakness of the lower back. The indications carried in Sacred Lotus sources & references are lumbar pain, frequency of urine and irregular menses; the wider reference literature sets them out as follows.

• Lumbar pain and low back pain
• Lumbar strain, including chronic and recurrent strain
• Stiffness and weakness of the lower back
• Frequency of urination
• Irregular menstruation
• Abnormal vaginal discharge
• Emaciation and taxation (consumptive) disorders, in the older texts
• Pain referring from the lower back into the hip and buttock, as a local point

Source: Sacred Lotus sources & references (existing indication record); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 572); Chinese Acupuncture & Moxibustion (pp. 247–248); cross-referenced against multiple online sources.

How is Yao Yan used in practice?

Yao Yan lies in the lower back, in the pair of shallow depressions that appear roughly three and a half cun to either side of the midline at the level of the lower border of the fourth lumbar vertebra — the level of Yao Yang Guan (DU-03). On many people those two hollows are visible from behind, which is where the name comes from. It is always treated as a bilateral pair, and it is a local point: it is chosen because the complaint is in the lower back, not because a distant organ is implicated.

Which points is Yao Yan combined with?

• With DU-03 Yao Yang Guan — the midline Governing Vessel point at the same level, the natural centre of a local lumbar treatment with Yao Yan either side of it.
• With BL-23 Shen Shu and BL-52 Zhi Shi — the Bladder channel points higher in the lumbar region, at one and a half and three cun lateral respectively. These are the channel points of the low back; Yao Yan is the extra point that sits below and outside them.
• With BL-25 Da Chang Shu — the Back-Shu point of the Large Intestine, at the same L4 level but closer to the midline; the two are commonly used in the same local prescription.
• With Shi Qi Zhui Xia ("Below the Seventeenth Vertebra") — the extra point on the midline just below, at L5. The two extra points of the lower back are frequently used together, and both are held in Sacred Lotus sources & references.
• With BL-40 Wei Zhong and Yao Tong Xue — the distal points for lumbar pain; Yao Tong Xue ("Lumbar Pain Point") is the extra point on the back of the hand used with movement of the back, and is also held here.
• With moxibustion — warming methods over the lumbar hollows are widely recorded for the chronic, cold, worse-with-tiredness presentation of low back ache.

Where does Yao Yan sit among the lumbar points?

Read the lower back outward from the spine and the picture is orderly: the Governing Vessel on the midline (DU-03 at L4, DU-04 Ming Men higher at L2), the inner Bladder line at one and a half cun (BL-23 Shen Shu, BL-25 Da Chang Shu), the outer Bladder line at three cun (BL-52 Zhi Shi), and Yao Yan furthest out at about three and a half cun. Yao Yan is therefore the most lateral of the routinely used lumbar points — which is precisely why its depth matters more than the others', and why the needling record below is worth reading before the combinations above.

Source: Sacred Lotus sources & references (location; DU-03, BL-23, BL-25, BL-52, Shi Qi Zhui Xia and Yao Tong Xue records); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 572); Chinese Acupuncture & Moxibustion (pp. 247–248); cross-referenced against multiple online sources.

Where is Yao Yan located?

• A Manual of Acupuncture (p. 572): In the depression approximately 3.5 cun lateral to the lower border of L4 Yao Yang Guan (DU-3).

How is Yao Yan needled, and what does the literature record about depth?

Reference record only — this sets out what the standard texts document, not instruction for a reader. Sacred Lotus sources & references record perpendicular insertion of 1 to 1.5 cun at Yao Yan, and moxibustion is widely recorded over the lumbar region. That is a deeper range than most extra points carry, and the reason is simply that there is a lot of muscle over the lower back. It is also why depth is the one thing about this point that a reader should understand properly.

• Angle documented: perpendicular into the depression.
• Depth documented: approximately 1 to 1.5 cun.
• Moxibustion: documented as applicable, and traditionally favoured here for chronic and cold presentations of low back ache.

What is the safety concern at Yao Yan?

Yao Yan is a lumbar point lateral to the spine, and the documented concern there is the same one that applies across the lower back: deep needling can pass beyond the paraspinal muscles into the retroperitoneal space behind the abdominal cavity. The following is what is actually documented, stated precisely.

• What the imaging work establishes. An MRI study of 61 healthy subjects measured both the "dangerous depth" and the effective safe depth of perpendicular and oblique needling at the acupoints of the kidney region — BL-21, BL-22, BL-23, BL-50, BL-51 and BL-52 — and found that safe depth varies substantially with body size: markedly greater in overweight subjects and markedly shallower in underweight ones, where the authors concluded that direction and depth must be restricted to avoid accident (Zhongguo Zhen Jiu 2022;42(9):1006–1010, PMID 36075596). Those points sit at one and a half and three cun lateral, higher in the lumbar region than Yao Yan. The study does not measure Yao Yan itself, and we do not claim that it does — but it is the best-quantified evidence available that safe depth in this region is a function of the individual, not a fixed number.
• Where the kidneys actually are. The kidneys lie retroperitoneally, behind the abdominal cavity and in front of the lumbar muscles, spanning roughly the twelfth thoracic to the third lumbar vertebral levels; the lower pole of the right kidney sits lowest and normal variation extends further down. Yao Yan is recorded at the fourth lumbar level, at the lower margin of that territory rather than in its centre. That is the accurate statement, and it is why we describe the hazard as retroperitoneal rather than asserting a renal injury risk we cannot source specifically for this point. A reader should take from it that the structures deep to Yao Yan are not muscle all the way down.
• What the case literature documents. Injury to retroperitoneal structures following acupuncture is recorded in the published case literature — including a retroperitoneal haematoma from rupture of a pseudoaneurysm caused by acupuncture (J Urol 1998;159(6):2087, PMID 9598531) and a retroperitoneal abscess complicating acupuncture (J Korean Med Sci 2003;18(5):756–757, PMID 14555834). Systematic reviews of acupuncture adverse events list traumatic organ injury among the small number of genuinely serious events on record and conclude that these overwhelmingly followed improper technique rather than acupuncture as such (Zhang et al., Bull World Health Organ 2010;88(12):915–921C, PMID 21124716, PMC2995190; Am J Chin Med 2024, PMID 39460372).
• Honest limit of what we can source. We could not locate a published caution or case report naming Yao Yan specifically in connection with kidney injury. Rather than assert one or omit the subject, we record what is documented: a bounded depth in the reference texts, quantified evidence that safe depth in the lumbar region depends heavily on body size, and a published record of retroperitoneal injury from deep needling in this area.

Acupuncture is performed by qualified, licensed practitioners. This record documents what the literature states and is not a technique guide.

Source: Sacred Lotus sources & references (existing needling record); Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 572); Chinese Acupuncture & Moxibustion (pp. 247–248); PubMed PMID 36075596, 9598531, 14555834, 21124716 (PMC2995190), 39460372 — each verified resolvable and checked for retraction status before citation.

What does the name Yao Yan mean?

Yao Yan means "Lumbar Eyes" — yao for the lumbar region or waist, yan for eye. The name is purely descriptive and unusually literal: on many people a pair of shallow dimples is visible in the lower back either side of the spine, and those hollows are the "eyes". Anyone who has looked at anatomical drawings of the back will recognise them. Some sources render the name "Lumbar Eye" or "Eyes of the Lower Back"; they describe the same landmark. The point is designated EX-B7 in the modern extra-point numbering (older texts write M-BW-24).

Is Yao Yan a channel point?

No. Yao Yan is an extra point. Extra points sit outside the fourteen channels: they were recorded because a particular spot was observed to be clinically useful, not because channel theory predicted it. They therefore carry no five-shu, yuan, luo, xi-cleft, back-shu or front-mu classification, which is why our record shows no channel and no point categories, and why the actions above are framed as documented uses rather than as channel functions. Its near neighbours on the outer Bladder line — BL-52 Zhi Shi in particular — are channel points, and it is from them that the organ-theory language sometimes wrongly attached to Yao Yan has drifted.

Is there research on Yao Yan?

There is essentially none, and we will say so rather than dress up the literature. Yao Yan appears in acupuncture trials for low back pain only as one point within multi-point local protocols; those results describe the protocol, not this point, and are not cited here as though they did. A comprehensive search of the indexed literature returns almost nothing addressed to the point itself.

• One preclinical study names it. A rat electrophysiology study ranked acupoints and extra points by their effect on the electrical activity of gonadotropin-releasing hormone neurons in the hypothalamus, and placed Yao Yan (EX-B7) in the second tier of extra points, behind Zi Gong (EX-CA1) and level with Dan Nang (EX-LE6); the authors' conclusion was about the general principle that points sharing a nerve segment with the reproductive organs have the greatest effect, not about Yao Yan (J Tradit Chin Med 2010;30(1):30–39, PMID 20397460). This is animal neurophysiology, and it does not support any clinical claim.
• The safety literature discussed in the needling section above is the other body of work with real bearing on this point, and it concerns lumbar needling generally rather than Yao Yan specifically.

Yao Yan's standing rests entirely on long empirical use as a local point of the lower back. That is a legitimate basis in this tradition, and it is the accurate one to state.

How does Yao Yan compare with the points around it?

BL-23 Shen Shu is the Back-Shu point of the Kidneys, on the Bladder channel at the second lumbar level and one and a half cun lateral — the point that actually carries the Kidney-tonifying function, and the one a reader who arrived here searching for it wants. BL-52 Zhi Shi lies on the outer Bladder line at three cun, the nearest channel point to Yao Yan. DU-03 Yao Yang Guan is on the midline at the same level, and DU-04 Ming Men higher at L2. Shi Qi Zhui Xia is the extra point on the midline just below at L5. Among all of these, Yao Yan is the most lateral and the most purely local — chosen for the back itself, in the visible hollow that gave it its name.

Source: Sacred Lotus sources & references; Deadman & Al-Khafaji, A Manual of Acupuncture, extra points (p. 572); Chinese Acupuncture & Moxibustion (pp. 247–248); PubMed PMID 20397460, 36075596 — each verified resolvable and checked for retraction status before citation; cross-referenced against multiple online sources.