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    Back-Shu of the Small Intestine · Fire · Bladder inner line

    BL-27Xiǎo Cháng Shū 小腸俞

    Back-Shu of the Small Intestine 小腸. Front-Mù pair: REN-4 Guān Yuán.

    Spinal level
    S1
    1.5 cùn lateral to the spine
    Element
    Fire
    Front-Mù pair
    REN-4 Guān Yuán

    Location

    1.5 cùn lateral to the median sacral crest, level with the 1st posterior sacral foramen (S1).

    Actions

    • Regulates the Small Intestine
    • Clears Damp-Heat from the Lower Jiāo
    • Separates the pure from the turbid

    Indications

    Lower abdominal pain, dysuria, sacral pain, seminal emission.

    Located on the sacrum — needled shallowly, moxa welcome.

    Needling technique

    Perpendicular 0.8–1.2 cùn into the sacrum. Do not attempt to enter the foramen.

    Moxibustion

    Very responsive to moxa for cold-type Lower Jiāo patterns.

    Cautions

    Avoid strong stimulation in pregnancy.

    Classical pairings

    • REN-4 Guān Yuán — Front-Mù of the Small Intestine
    • SI-4 Wàn Gǔ — Yuán-source of the Small Intestine
    • BL-28 Páng Guāng Shū — combined for Lower Jiāo Damp-Heat

    Open in the point database

    View live location diagrams, additional research citations and full needling metadata for BL-27.

    Open BL-27 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.