BL67 Acupuncture Point (Zhiyin)
BL67 Acupuncture Point
Reaching Yin at the Corner of the Fifth Toenail: Anatomy, Mechanism, and Why the Last Point of the Bladder Channel Anchors Breech Care and Headache Treatment
BL67 (Zhiyin, translated as Reaching Yin) is the final point of the Bladder channel, sitting at the outside corner of the little toenail where the line along the lateral nail border meets the line along the nail base, about 0.1 cun from the corner itself. It is the jing-well and metal point of the channel, and it is almost certainly the most researched single acupuncture point in obstetrics: moxibustion at BL67 has been studied in randomized trials and Cochrane reviews as a way of encouraging a breech baby to turn head down (Coyle et al., 2023).
Classical texts also send clinicians to this tiny spot for problems at the far opposite end of the channel, particularly vertex and occipital headache and eye discomfort near the inner corner of the eye. That combination, a nail-corner point on the smallest toe with a reputation for influencing the head and the uterus, makes the bl67 acupuncture point one of the more interesting locations in the point system to explain in modern terms.
- Location and layers: BL67 sits over the base of the distal phalanx of the fifth toe at the lateral nail corner, where skin, nail fold, and periosteum are separated by almost no soft tissue. Needling here is deliberately shallow (0.1 to 0.2 cun, perpendicular or angled toward the ankle) or done as a quick prick to bleed (Deadman et al., 2007).
- Traditional categories in modern language: classical sources call BL67 the jing-well and metal point of the Bladder channel and credit it with dispersing wind, clearing the head and eyes, and turning a malpositioned fetus (Deadman et al., 2007; Kim, 2011). We present these as traditional attributions and explain the observed effects through cutaneous afferent input, reflex autonomic responses, and central pain modulation rather than through qi.
- Nerve story: the nail corner is supplied by the lateral dorsal cutaneous branch of the sural nerve with input around the S1 segment, and nail-bed skin has a high density of small-diameter fibers, so brief stimulation produces a sharp, well-localized afferent volley that recruits spinal and brainstem pain-modulating circuits (Zhao, 2008).
- Research picture for breech care: a Cochrane review concluded that moxibustion added to usual care probably reduces the number of babies still non-cephalic at birth, with moderate-certainty evidence, and a separate meta-analysis of 16 trials reported a higher rate of cephalic presentation at birth with moxibustion (Coyle et al., 2023; Liao et al., 2021). Trials also documented more fetal movement during and after BL67 stimulation, which is the most commonly proposed mechanism (Cardini & Weixin, 1998; Neri et al., 2002).
- Clinical practice framing: outside of supervised pregnancy care, BL67 is used as a distal point for vertex and occipital headache, neck stiffness, eye discomfort, and pain around the little toe and lateral foot, usually with a small number of needles and short retention because the sensation is strong (Deadman et al., 2007). Reviews of acupuncture for headache and chronic pain test whole protocols, not single points (Linde et al., 2016; Vickers et al., 2018).
- De qi at BL67 is not subtle: most people describe a bright, pinpoint sting that fades within seconds into a warm ache spreading across the toe. Because the response is so brisk, we often stimulate briefly and remove the needle rather than leaving it in for a full session.
Stubborn Headaches That Sit at the Top or Back of Your Head?
Vertex and occipital headaches often involve the upper cervical muscles, the suboccipital region, and a nervous system that has become efficient at amplifying pain. At Morningside Acupuncture we build treatment around the neck and skull base, then add distal points along the same channel, including BL67 at the little toe, to broaden the input the nervous system receives. Most patients feel the difference in muscle tone and head pressure within the first few visits. Book a session and let's map out what is actually driving your headaches.
Schedule NowAnatomy of BL67: Why the Corner of the Fifth Toenail Is Such an Important Location
There is almost nothing between the surface and the bone at BL67. The point lies on the dorsal aspect of the little toe over the base of the distal phalanx, where thin skin and the lateral nail fold sit directly on periosteum, with only a small amount of loose connective tissue, tiny tendon slips, and a dense capillary bed in between (Deadman et al., 2007). Because there is no muscle belly to load and no fascial plane to spread through, this location is not treated like a typical body point.
What loads it clinically is footwear pressure, nail-fold irritation, toe deformity, and the general biomechanical demands placed on the lateral column of the foot during push-off.
The nerve geography is the interesting part. Sensation at the lateral little toe is carried by the lateral dorsal cutaneous branch of the sural nerve, feeding into roots around S1, and nail-bed and nail-fold skin carries an unusually high density of small-diameter A-delta and C fibers. A brief, precise stimulus here therefore produces a large, sharply timed afferent volley for a very small treated area.
Experimental work on acupuncture analgesia shows that this kind of input engages segmental spinal inhibition and brainstem descending pathways using endogenous opioid, serotonergic, and noradrenergic signaling, which is one reason strong distal stimulation can influence symptoms far from the needle site (Zhao, 2008). Studies of BL67 stimulation in pregnancy have also documented measurable downstream physiological responses, including changes in fetal movement and heart rate patterns during treatment, suggesting reflex autonomic effects rather than any purely local action (Neri et al., 2002).
Safety at BL67 is mostly about restraint. The digital arteries and veins run along the sides of the toe and the nail bed is highly vascular, so bleeding is common with the prick-to-bleed technique and is usually expected rather than alarming. Conventional needling is 0.1 to 0.2 cun, perpendicular or angled proximally, with clean technique and no forced depth toward bone (Deadman et al., 2007).
Classical and modern texts restrict stimulation of this point during pregnancy outside the supervised breech context, and at least one text notes that treating a baby who has already turned may unsettle a good position, which is why moxibustion is stopped once the baby is head down (Kim, 2011; Cunningham, 2013).
Related Bladder Channel Related Pain Finder Leg Ankle FootBL67 at a Glance: Classification, Location, and Clinical Use
| Category | Detail |
|---|---|
| Traditional Name | Zhiyin (Reaching Yin), BL67, also written Bladder 67 or UB67 |
| Channel Classification | Bladder channel of Foot Taiyang, terminal point of the channel where it links with the Kidney channel |
| Point Categories | Jing-well point of the Bladder channel; metal point of the Bladder channel in the five-shu system |
| Precise Location | On the dorsal aspect of the little toe, at the junction of a line along the lateral border of the nail and a line along the base of the nail, about 0.1 cun from the nail corner |
| Tissue Stimulated | Nail-fold skin and thin subcutaneous tissue over the base of the distal phalanx of the fifth toe, richly innervated by the lateral dorsal cutaneous branch of the sural nerve; nearby myofascial targets used in dry needling include the abductor digiti minimi, the interossei of the foot, and the deep intrinsic foot muscles |
| Needle Depth / Direction | 0.1 to 0.2 cun, perpendicular or angled proximally, or a quick prick to bleed; for breech work the point is warmed with moxibustion rather than needled |
| De Qi Sensation | A bright, pinpoint sting on insertion that settles quickly into a warm, spreading ache across the little toe and sometimes up the lateral foot |
| Primary Clinical Uses | Breech presentation care with moxibustion under professional supervision; vertex and occipital headache and neck stiffness in classical listings; eye and inner canthus discomfort in classical listings; little toe and lateral foot pain |
| Common Point Combinations |
|
In the classical literature summarized by Deadman and colleagues, BL67 is unusual among the twelve jing-well points because it carries no recorded role in reviving consciousness; its resemblance to the others is limited to clearing heat and fullness from the far end of the channel, which in this case means the head.
The Spiritual Pivot advises selecting points on the feet for disorders of the head, and later song literature lists this point for complaints of the face and head, which is how it came to be used for vertex and occipital headache, stiff neck, nasal and ear symptoms, and eye pain around the inner corner, particularly in acute rather than long-standing presentations.
Its better-known traditional action, however, is on the uterus: classical sources credit it with turning a malpositioned fetus, encouraging labor that is slow to start or slow to progress, and helping expel a retained placenta, and they explain that reputation through the point's position at the end of a yang channel where energy is said to change polarity and pass into the paired Kidney channel, hence the name Reaching Yin (Deadman et al., 2007).
Also striking is that it is one of the very few distal Bladder channel points listed for difficult or painful urination, though modern practitioners rarely choose it for that purpose. What makes the classical pattern so notable is the sheer distance involved: a point at the corner of the smallest toenail was credited with acting on the crown of the head at one end and the uterus at the other.
Why BL67 Is Used for Headaches at the Opposite End of the Body
The pairing of a toe point with head symptoms looks strange until you follow the channel. The Bladder channel is described as running from the inner corner of the eye over the top of the skull, down the back of the neck and spine, through the posterior leg, and out to the little toe, so the head and the fifth toe sit at the two ends of the same described line. In physiological terms, the useful part of that observation is not a literal conduit but the fact that both ends feed into a shared central pain-processing network.
Input from a strongly innervated distal site does not stop at the S1 segment; it ascends and recruits brainstem structures that project back down onto dorsal horn neurons, dampening how readily incoming signals from other regions, including the upper cervical segments that generate most vertex and occipital head pain, are amplified (Zhao, 2008).
That descending inhibition story explains why distal points can be worth the extra needle even when the obvious problem is in the neck. Practically, we still needle the suboccipital and cervical structures where the symptoms live, then add BL67 as a short, brisk distal stimulus.
The result patients usually report is a general drop in head pressure and neck guarding rather than an instant change at the toe. Reviews of acupuncture for headache prevention consistently test whole protocols of this kind, and they suggest modest but real reductions in headache frequency compared with usual care, with smaller differences from sham needling (Linde et al., 2016).
The obstetric use points to a different mechanism. Trials measuring what happens during BL67 stimulation have recorded increased fetal movement, more heart rate accelerations, and a lower baseline fetal heart rate compared with minimal stimulation, which is consistent with a reflex autonomic and possibly endocrine response rather than a local effect at the toe (Cardini & Weixin, 1998; Neri et al., 2002).
The prevailing hypothesis, discussed in the Cochrane review, involves changes in placental hormone activity and uterine tone that give the baby more incentive and more opportunity to reposition (Coyle et al., 2023). It remains a hypothesis, and we describe it to patients that way.
What the Research Shows for BL67
BL67 is one of the rare points with a research base built around the point itself rather than around a multi-point protocol, because the breech trials stimulate this single location bilaterally. That makes the obstetric evidence unusually interpretable, though it is still limited by variable technique, difficulty blinding a treatment that produces heat and smoke, and the fact that many breech babies turn on their own before term.
For headache, neck pain, and foot pain, the evidence works the other way: trials test complete treatment protocols in which BL67 may or may not be included, so the honest framing is that this point is one component of a plan with reasonable overall support, not a standalone remedy.
| Study | Type | Focus | Key Finding |
|---|---|---|---|
| Coyle et al., 2023 | Cochrane systematic review | Moxibustion at BL67 for cephalic version of breech presentation | Moxibustion added to usual care probably reduces the number of babies still in a non-cephalic position at birth, with moderate-certainty evidence, and probably reduces the need for oxytocin during labor. |
| Liao et al., 2021 | Systematic review and meta-analysis (16 RCTs, 2,555 participants) | Moxibustion and acupuncture at BL67 for breech presentation | Pooled results favored moxibustion over control for cephalic presentation at birth, with the authors noting differences in effect size between study populations. |
| Vas et al., 2013 | Multicentre randomized controlled trial (406 women, 33 to 35 weeks) | True moxibustion at BL67 versus moxibustion at a non-specific point versus usual care | Cephalic presentation at term was more common with true moxibustion at BL67 than with usual care alone, while the comparison with the non-specific point was less clear cut. |
| Cardini & Weixin, 1998 | Randomized controlled trial (260 primigravidas at 33 weeks) | Moxibustion at BL67 for fetal activity and breech correction | Women in the moxibustion group counted more fetal movements per hour and had a higher rate of cephalic presentation at follow-up, though the open design limits how much weight the result carries. |
| Neri et al., 2002 | Small single-blind crossover study (12 women) | Computerized non-stress test during acupuncture plus moxibustion at BL67 | True stimulation was associated with more fetal movements and accelerations and a lower baseline fetal heart rate, changes not seen with minimal stimulation, suggesting a measurable reflex response. |
| Linde et al., 2016 | Cochrane systematic review | Acupuncture for prevention of episodic migraine | Acupuncture added to usual care appears to reduce headache frequency, with smaller and less certain differences compared with sham needling. |
| Vickers et al., 2018 | Individual patient data meta-analysis (about 20,800 patients) | Acupuncture for chronic musculoskeletal and headache pain | Acupuncture was better than sham and no-acupuncture controls for chronic pain, with effects that persisted over 12 months rather than fading immediately. |
| Zhao, 2008 | Narrative review of mechanism research | Neural pathways underlying acupuncture analgesia | Needle stimulation of somatic afferents engages spinal and supraspinal circuits using opioid, serotonergic, and noradrenergic signaling, providing a plausible basis for distal point effects. |
Moxibustion for a Breech Baby: How BL67 Became the Most Studied Point in Obstetric Acupuncture
Safety first, because this is the one use of BL67 that people try to copy at home. Breech version work with zhiyin moxibustion belongs under the care of a licensed acupuncturist working alongside your obstetrician or midwife, after the presentation has been confirmed by ultrasound and any contraindication to version has been ruled out. It is typically started around weeks 33 to 36, and it is stopped as soon as the baby is confirmed head down.
Classical sources restrict strong stimulation of this point in pregnancy outside exactly this supervised context, and modern texts repeat the caution, partly because a point used to encourage movement could in principle unsettle a baby who is already well positioned (Kim, 2011; Cunningham, 2013). Breech baby moxibustion is not a self-treatment technique, and it is not a substitute for external cephalic version or for the obstetric plan your team recommends.
The technique itself is simple, which is part of why it has been studied so widely. A moxa stick made of compressed mugwort is held close enough to the outer corner of each little toenail to feel comfortably warm but never hot, usually for around 15 to 20 minutes per side, once or twice daily for a defined course, with the patient reclining comfortably and clothing loosened. Some practitioners add acupuncture or electrical stimulation at the same point.
Deadman and colleagues note that in China it has long been common to teach the method and then have the patient continue at home, which is essentially the model most bl67 moxibustion trials have used (Deadman et al., 2007). We prefer to teach it in the clinic first, check technique and skin response, and stay in contact through the course.
On results, the honest summary is cautiously positive rather than definitive. The most recent Cochrane review found that moxibustion combined with usual care probably reduces the number of babies still non-cephalic at birth, rated as moderate-certainty evidence, and a 2021 meta-analysis of 16 trials pointed the same direction (Coyle et al., 2023; Liao et al., 2021). Individual trials have reported increased fetal activity during and after stimulation, which is the most commonly proposed explanation for how bl 67 breech work might operate (Cardini & Weixin, 1998; Neri et al., 2002).
Not every trial has been positive, blinding is genuinely difficult, and a meaningful number of breech babies turn spontaneously regardless of treatment. What we tell patients is that zhiyin breech moxibustion is low risk, inexpensive, and reasonably supported as an adjunct worth trying within a window of a few weeks, not a guarantee.
Breech Baby and Weighing Your Options Before 36 Weeks?
Moxibustion at BL67 is a low-cost, non-invasive option that is best started around weeks 33 to 36 and always coordinated with your obstetrician or midwife. At Morningside Acupuncture we confirm that your care team is on board, teach the technique properly, and monitor how you and the baby respond rather than handing you a moxa stick and sending you home. If the baby turns, we stop. Schedule a consultation early so there is time to work with, not against, the calendar.
Schedule NowBL67 in the Context of Trigger Point Work
BL67 itself is not a muscular target: there is no meaningful muscle belly at the corner of the fifth toenail, so it cannot host a taut band or a classic trigger point. What it does sit at is the far end of a kinetic chain that dry needling addresses directly. Patients with lateral foot pain, toe cramping, or a burning ache under the little toe often have active trigger points in the abductor digiti minimi, the interossei, and the deeper intrinsic foot muscles, and referral patterns from these muscles can reach the toes and the lateral border of the foot (Simons et al., 1999).
In those cases we treat the muscles where the pain is generated and may add a brief stimulus at BL67 as a distal channel point, not as the main event.
For headache and neck presentations, the combination runs in the opposite direction. The treatment weight sits in the neck, where we needle the suboccipitals, upper trapezius, splenius group, and semispinalis according to the referral pattern the patient describes, and BL67 is added as a short distal input intended to broaden the segmental and descending inhibition recruited during the session (Zhao, 2008). Calf and posterior leg work along the same channel, including the gastrocnemius and soleus, often belongs in the same plan when patients present with combined neck stiffness and posterior chain tightness.
As always, acupuncture and dry needling here mean the same tool used with different reasoning: one needle, several frameworks for deciding where it goes.
BL67 Headache and Foot Pain Treatment at NYC's Highest-Rated Acupuncture Clinic
Morningside Acupuncture is the highest-rated acupuncture and dry needling clinic in New York City with over 500 five-star Google reviews, and we treat headaches, neck pain, and foot pain with a blend of classical point selection and modern dry needling. BL67 rarely works alone: it is paired with neck, skull base, and lower leg work chosen for your presentation. Every plan is explained in plain language so you know why each needle goes where it does. Schedule your visit and start with a thorough assessment.
Schedule NowFrequently Asked Questions
What does BL67 feel like when needled?
Sharp and brief. Because the nail corner is densely innervated and there is very little tissue between skin and bone, most people feel a bright pinpoint sting on insertion that softens within a few seconds into a warm ache spreading over the little toe. Some patients feel a quick tingle travel up the outside of the foot. The sensation is stronger per millimetre of needle than almost anywhere else on the body, which is why we insert shallowly, stimulate briefly, and often remove the needle rather than leaving it in place. If the point is pricked to bleed, expect a drop or two of blood and a short-lived tender spot afterwards.
Why treat a headache at the little toe instead of just needling my head?
We usually do both. The Bladder channel is described as running from the inner corner of the eye across the top of the skull and down the back of the body to the fifth toe, so classical practice treats the head and this toe as two ends of one line, and texts such as the Spiritual Pivot explicitly recommend choosing foot points for head complaints (Deadman et al., 2007). The modern rationale is that a strong, well-localized distal stimulus recruits spinal and brainstem pain-modulating pathways that dampen how readily signals from other regions, including the upper neck, are amplified (Zhao, 2008). Local needling addresses the tissue that hurts; distal points such as BL67 give the nervous system a second, different input to work with.
Can I press BL67 myself between sessions?
Yes, with one firm exception: if you are pregnant, do not press, warm, or otherwise stimulate BL67 on your own, since this point is traditionally restricted in pregnancy outside supervised breech care (Kim, 2011). Otherwise, find the outside corner of your little toenail and place a fingertip or thumbnail edge just beside the corner, about a nail's width from it. Apply steady, moderate pressure for 20 to 30 seconds, release for a few seconds, and repeat two or three times per foot, then do the other side. Two or three short rounds a day is plenty. It should feel sharp but tolerable, never bruising, and you should stop if the skin becomes sore or the nail fold is irritated or infected.
Is BL67 safe to needle?
In non-pregnant adults it is a low-risk point when treated conventionally: shallow insertion of 0.1 to 0.2 cun, perpendicular or angled toward the ankle, with clean technique (Deadman et al., 2007). There are no major vessels or nerves at risk, though the toe is vascular and small bleeds or brief tenderness are common, especially with prick-to-bleed technique. The important restriction is pregnancy. Classical and modern texts treat strong stimulation of BL67 as contraindicated in pregnancy except in the supervised breech context, where moxibustion, not needling, is the standard method, and where treatment is discontinued once the baby has turned (Kim, 2011; Cunningham, 2013). We also avoid needling through inflamed, infected, or damaged nail-fold tissue.
Where exactly is BL67 located?
On the top-outer aspect of the little toe. Draw one imaginary line along the outer border of the toenail and another along the base of the nail; BL67 sits where those two lines meet, roughly 0.1 cun (about the width of the nail edge, a millimetre or two) away from the corner itself, on the side away from the fourth toe. It is the last point of the Bladder channel, which is why texts describe the channel as ending at the lateral tip of the little toe. If you are looking at your own foot, it is the small notch of skin just outside the outer corner of the little toenail.
When should moxibustion for a breech baby be started, and when should it stop?
Most protocols begin between weeks 33 and 36, once breech presentation has been confirmed by ultrasound and your obstetric team agrees it is appropriate. Classical sources suggest the mid-30s of gestation as the best window, and modern trials have generally recruited in the same range (Deadman et al., 2007; Vas et al., 2013). Treatment stops as soon as the baby is confirmed head down. If the baby has not turned by the end of the agreed course, the next step is a conversation with your obstetrician about external cephalic version or delivery planning, not more moxibustion on your own.
References
- Deadman, P., Al-Khafaji, M., & Baker, K. (2009). A manual of acupuncture. Journal of Chinese Medicine Publications.
- Kim, H. (2008). Handbook of Oriental medicine (3rd ed.). Harmony & Balance Press.
- Cunningham, P. M. (2000). Acupuncture points: A practical guide to classical and modern usage. Odyssey Press.
- Simons, D. G., Travell, J. G., & Simons, L. S. (1999). Travell & Simons' myofascial pain and dysfunction: The trigger point manual, Vol. 1: Upper half of body (2nd ed.). Williams & Wilkins.
- Coyle, M. E., Smith, C. A., & Peat, B. (2023). Cephalic version by moxibustion for breech presentation. Cochrane Database of Systematic Reviews, 2023(5), CD003928. https://doi.org/10.1002/14651858.CD003928.pub4
- Liao, J.-A., Shao, S.-C., Chang, C.-T., Chai, P. Y.-C., Owang, K.-L., Huang, T.-H., Yang, C.-H., Lee, T.-J., & Chen, Y.-C. (2021). Correction of breech presentation with moxibustion and acupuncture: A systematic review and meta-analysis. Healthcare, 9(6), 619. https://doi.org/10.3390/healthcare9060619
- Vas, J., Aranda-Regules, J. M., Modesto, M., Ramos-Monserrat, M., Barón, M., Aguilar, I., Benítez-Parejo, N., Ramírez-Carmona, C., & Rivas-Ruiz, F. (2013). Using moxibustion in primary healthcare to correct non-vertex presentation: A multicentre randomised controlled trial. Acupuncture in Medicine, 31(1), 31-38. https://doi.org/10.1136/acupmed-2012-010261
- Cardini, F., & Weixin, H. (1998). Moxibustion for correction of breech presentation: A randomized controlled trial. JAMA, 280(18), 1580-1584. https://doi.org/10.1001/jama.280.18.1580
- Neri, I., Fazzio, M., Menghini, S., Volpe, A., & Facchinetti, F. (2002). Non-stress test changes during acupuncture plus moxibustion on BL67 point in breech presentation. Journal of the Society for Gynecologic Investigation, 9(3), 158-162. https://doi.org/10.1177/107155760200900307
- Linde, K., Allais, G., Brinkhaus, B., Fei, Y., Mehring, M., Vertosick, E. A., Vickers, A., & White, A. R. (2016). Acupuncture for the prevention of episodic migraine. Cochrane Database of Systematic Reviews, 2016(6), CD001218. https://doi.org/10.1002/14651858.CD001218.pub3
- Vickers, A. J., Vertosick, E. A., Lewith, G., MacPherson, H., Foster, N. E., Sherman, K. J., Irnich, D., Witt, C. M., & Linde, K. (2018). Acupuncture for chronic pain: Update of an individual patient data meta-analysis. Journal of Pain, 19(5), 455-474. https://doi.org/10.1016/j.jpain.2017.11.005
- Zhao, Z. Q. (2008). Neural mechanism underlying acupuncture analgesia. Progress in Neurobiology, 85(4), 355-375. https://doi.org/10.1016/j.pneurobio.2008.05.004
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