What Shenshu does
Shenshu is treated here as a practical point rather than a curiosity: where it sits, how it is needled, what the tradition says it does, and the skin conditions in this database that name it.
Actions
- Tonifies Kidney Yang and nourishes Kidney Yin
- Nourishes Kidney Essence
- Benefits bones and Marrow as well as the lower back
- Regulates the water passages and resolves Dampness in the Lower Burner
- Strengthens the Uterus and menstruation
- Benefits the eyes and ears
- Strengthens Kidney Qi and reception of Lung Qi
Location
One and a half cun measured from the landmark shown in the diagram and the location text, lateral to the lower border of the spinous process of the 2nd lumber vertebra (L2).
How to find it
Find the bony landmark first, then feel for the hollow or tender spot the location describes. The point is usually sensitive when pressed. Trace the highest point of each iliac crest and join the two; in most people that line crosses the spinous process of the fourth lumbar vertebra. Count upward two processes to reach L2, then move 1.5 cun sideways to the lower border of the L2 spinous process. Zhishi BL-52 sits at the same level but 3 cun from the midline, and the points from Fufen BL-41 to Zhibian BL-54 travel on the lateral branch of the Bladder channel while those from Fengmen BL-12 to Baihuanshu BL-30 run on the medial branch.
Deqi
De qi at this point is felt as local distension, heaviness or aching, and may travel a short way along the channel.
A cun is a proportional body measurement, not a fixed length: one cun is about the width of the thumb at the knuckle, 1.5 cun about two finger widths, and 3 cun about the width of four fingers. On an average adult one cun is roughly one inch, but it scales with the person, which is why the texts measure in cun rather than centimetres.
Technique
Needling
Angle: 90 degrees, perpendicular Depth: Standard depth one to one cun. Direction: Needle in the direction the location describes.
Moxibustion
Moxibustion is particularly recommended here: ten to twenty minutes with a moxa stick, or direct cones where Kidney yang or qi needs warming. The reference adds it to tonify yang and qi but withholds it when Kidney yin is deficient, because the extra heat would aggravate dryness and agitation.
Skin uses
Shenshu is the back-shu point of the Kidney, recorded to tonify Kidney Yang and Yin, nourish the Essence, regulate the water passages and strengthen the lower back. The traditional skin reasoning is indirect but coherent: Kidney Yin and Essence are described as the deep reserves that moisten and sustain the tissues, so where dryness or premature ageing of the surface is understood as a Kidney pattern, the recorded tonic action is the basis for considering it. The classical passage describes cold and heat, wasting and urinary signs, not the skin. Because no skin-specific classical indication is recorded for the point, the connection above is an indirect rationale, not trial evidence.
No skin-specific classical indication is recorded for this point. The rationale above is an indirect, traditional reading of the point, not a promise of benefit.
Point classifications
| Classification | Value |
|---|---|
| Channel | Meridian |
Classical record
The classical record summarises the classical use of this point without quoting a passage in full.
classical record
The point is set at the level of the fourteenth vertebra counted from the first cervical vertebra, the measure by which the old text placed the Kidney's back-shu point.
Ling Shu (Spiritual Pivot), Bei Shu chapter, classical citation recorded from the reference
It governs wasting from deficiency taxation, deafness caused by Kidney weakness, long-standing cold of the water organ, distension and fullness in the heart and abdomen, and flank fullness that draws into griping pain low in the abdomen.
Zhen Jiu Da Cheng (Great Compendium of Acupuncture and Moxibustion), classical citation recorded from the reference
Every deficiency that begins in the lower origin, with cold essence and no offspring, is addressed here.
Yi Zong Jin Jian (Golden Mirror of the Medical Tradition), classical citation recorded from the reference
Safety
Who should treat this point
Acupuncture and moxibustion are practitioner procedures. This page is educational and is not a guide to self-treatment.
Caution
Safety flags: the reference marks it as a dangerous point. Needle with care, adjust depth to the patient's build, and modify or avoid the point where a flag applies. The kidney lies directly beneath this point, with the peritoneum close behind it, so depth must be judged for the individual rather than taken from a table. A perpendicular needle, or one angled slightly towards the spine at 45 degrees, is accepted; an oblique line aimed sideways raises the risk to the organ. Thin patients need a shallower insertion than heavy ones, and the reference puts the usual range at 0.8 to 1.2 cun for an average adult, with 1.6 cun as the ceiling.
Deficiency and constitution
In a depleted patient the point is worked gently and briefly. In chronic Kidney deficiency the point is worked gently and often warmed with moxa rather than stimulated strongly, because the aim is to build what is empty. Very depleted or elderly patients tolerate shorter and lighter sessions, and the same care over depth applies.
Before treatment
Educational reference only. Skin that is spreading, painful, blistering or accompanied by fever needs medical assessment.
Modern evidence and safety
General references for acupuncture safety and skin evidence. They are not specific to this point, and they are not a claim that needling it treats any condition.
- Acupuncture-related adverse events: systematic review and meta-analyses of prospective clinical studies. BMJ Open, 2021. PMID: 34489268.
- Acupuncture for atopic dermatitis: a systematic review and meta-analysis. BMJ Open, 2024. PMID: 39638592.
- Manual acupuncture for the treatment of chronic spontaneous urticaria: a systematic review and meta-analysis. International Journal of Surgery, 2025. PMID: 40696933.
- Acupuncture in Dermatology: An Update to a Systematic Review. Journal of Alternative and Complementary Medicine, 2021. PMID: 32955916.
Evidence note
No controlled trial of this treatment in skin conditions was identified for this entry. What is described here rests on the classical and later materia medica record and on traditional clinical use, not on controlled trial evidence, and it is not a prediction of benefit. Where skin-specific research does exist it is linked above.
Common questions
What does Shenshu do in skin practice?
It is used where the skin picture includes the conditions it is used with, always as part of a combination chosen for the pattern.
Is it safe?
Dangerous point - requires extra caution Deep needling contraindicated - shallow insertion only Needle Depth 0.8 - 1.2 cun Needle Angle 90° (Perpendicular), 45° (Oblique) Body Area Back - Lower (Lumbar)
Why is moxibustion added at Shenshu?
The point is the Kidney's back-shu, and the reference uses direct moxa on it to warm Kidney yang and qi when cold and depletion dominate. It is left out where yin is deficient and heat signs are present, because warming would add to the dryness and agitation rather than resolve them.
Does Shenshu treat the lower back on its own?
It is one of the main points for the lumbar area, chosen where the back aches, feels cold, or gives way with weak cold knees. It is usually combined with local and distal points such as Yinmen BL-37 and Weizhong BL-40 rather than relied on alone.