Bladder MeridianBL28

Pangguangshu 膀胱兪

For reference only · not a substitute for diagnosis or treatment

Short answer

Sacrum, 1.5 cun out from the median sacral crest, level with the second posterior sacral foramen.

Back-shu point of the Bladder

See it in 3DRotate the body and peel back the skin to see the bones and muscles beneath.
Open the 3D Acupoint Map →

🖼See it in pictures

Pangguangshu — ① Where on the body? — **① Where on the body?**

Pangguangshu — Textbook view — skin on the left, muscle and bone underneath on the right — **Textbook view — skin on the left, muscle and bone underneath on the right**
Location and structures come from our 3D model; only the drawing style was refined with AI. Labels are added by us.

Pangguangshu — ② Up close — **② Up close**

Pangguangshu — ③ Under the skin — **③ Under the skin**
Sacrum · Gluteus maximus muscle

Rendered straight from the 3D model at the computed location. The glowing ring marks Pangguangshu.

On this page

Where is Pangguangshu?
How do I find it on my body?
Before you press
How has it been used traditionally?
FAQ

1Where is Pangguangshu?

Sacrum, 1.5 cun out from the median sacral crest, level with the second posterior sacral foramen.

It is also level with Ciliao (BL32).

Beneath the point

Sacrum · Gluteus maximus muscle

Our 3D measurement · In our 3D model: level with posterior sacral foramen 2, 1.5 cun (30.9 mm) from the median sacral crest.

2How do I find it on my body?

Find the bony point under the dimple above each buttock: the posterior superior iliac spine.
A line joining the lower edges of the two spines crosses the midline at the S2 spinous process.
Midway from the posterior superior iliac spine to the S2 spinous process, feel for a dip: the second posterior sacral foramen (Ciliao).
At that height, press 1.5 cun out from the bony ridge down the middle of the sacrum (median sacral crest). This is half the 3-cun midline-to-shoulder-blade width.

What is a “cun”?

A cun is a body-scaled unit of length. The precise way is to divide a bone length into equal parts (proportional bone cun); finger widths are a quick estimate.

📖 Words explained

median sacral crest: The bumpy vertical ridge down the middle of the back of the sacrum. It is made from the spinous processes of the sacral bones that fused together.
spinous process: The bony spike sticking backward from the middle of each spine bone. The row of bumps you feel down the middle of the back is these, and they serve as the counting marks for back points.
gluteus maximus: The large, thick muscle that forms the buttock. It swings the leg back and gives power for climbing stairs and standing up.

3Before you press

⚠ Do not press when

Do not press this point during pregnancy.
Points over the low back and sacrum are traditionally avoided in pregnancy (WHO acupuncture safety guidelines, 1999).
Avoid broken or swollen skin and press only to a comfortable level.
Acupressure is not a substitute for medical care.

4How has it been used traditionally?

Classified as the back-shu point of the Bladder (Zhenjiu Jiayi Jing) — a historical classification, not a claim of effect.

From traditional texts — not a claim of effect.

?FAQ

Where exactly is Pangguangshu?

Sacrum, 1.5 cun out from the median sacral crest, level with the second posterior sacral foramen. It is also level with Ciliao (BL32).

How do I find Pangguangshu?

Find the bony point under the dimple above each buttock: the posterior superior iliac spine. A line joining the lower edges of the two spines crosses the midline at the S2 spinous process. Midway from the posterior superior iliac spine to the S2 spinous process, feel for a dip: the second posterior sacral foramen (Ciliao). At that height, press 1.5 cun out from the bony ridge down the middle of the sacrum (median sacral crest). This is half the 3-cun midline-to-shoulder-blade width.

Can I press it during pregnancy?

Do not press this point during pregnancy.

What should I watch out for?

Do not press this point during pregnancy. Points over the low back and sacrum are traditionally avoided in pregnancy (WHO acupuncture safety guidelines, 1999). Avoid broken or swollen skin and press only to a comfortable level. Acupressure is not a substitute for medical care.

← PreviousXiaochangshu · BL27 Next →Zhonglushu · BL29

Sources

Location: WHO Standard Acupuncture Point Locations in the Western Pacific Region (2008), p. 113
Standard comparison: Chinese national standard GB/T 12346-2021 (Nomenclature and location of meridian points), p. 17–18 — same location
Korean anatomical terms: KMLE medical dictionary
Traditional-use cross-check: AcuAtlas dataset (CC BY 4.0)
Classification source: Zhenjiu Jiayi Jing vol. 3, sec. 8 (back-shu line, 1.5 cun)
Safety: WHO Guidelines on Basic Training and Safety in Acupuncture (1999), p. 20 — lumbosacral points in pregnancy

Positions computed from the WHO standard locations (2008) on Z-Anatomy (CC BY-SA 4.0) · BodyParts3D © DBCLS. For reference only — not a substitute for diagnosis or treatment. See a clinician if you are unwell.