Back-Shu of the Bladder · Water · Bladder inner line
BL-28Páng Guāng Shū 膀胱俞
Back-Shu of the Bladder 膀胱. Front-Mù pair: REN-3 Zhōng Jí.
Spinal level
S2
1.5 cùn lateral to the spine
Element
Water
Front-Mù pair
REN-3 Zhōng Jí
Location
1.5 cùn lateral to the median sacral crest, level with the 2nd posterior sacral foramen (S2).
Actions
- Regulates the Bladder and promotes urination
- Clears Damp-Heat from the Lower Jiāo
- Strengthens the lumbar and sacral region
Indications
Urinary retention, enuresis, cystitis, low back stiffness, sacral pain.
First-line for lower Jiāo Water patterns; almost always paired with its Front-Mù REN-3.
Needling technique
Perpendicular 0.8–1.2 cùn into the sacrum.
Moxibustion
Excellent for cold-type enuresis and chronic urinary frequency from Kidney/Bladder Yáng deficiency.
Cautions
Avoid strong stimulation in pregnancy.
Classical pairings
- REN-3 Zhōng Jí — Front-Mù of the Bladder
- BL-23 Shèn Shū — Kidney-Bladder Yáng tonification
- SP-9 Yīn Líng Quán — clears Damp-Heat in the Lower Jiāo
Open in the point database
View live location diagrams, additional research citations and full needling metadata for BL-28.
Open BL-28 in the point database →Educational reference for licensed practitioners and students. Not medical advice — always correlate with a full TCM assessment and Western clinical judgement.