BL-25Dà Cháng Shū 大腸俞
Back-Shu of the Large Intestine 大腸. Front-Mù pair: ST-25 Tiān Shū.
Location
1.5 cùn lateral to the lower border of the spinous process of L4, at the level of the iliac crest.
Actions
- Regulates the Large Intestine
- Relieves constipation and diarrhoea
- Strengthens the lumbar region and relieves sciatica
Indications
Constipation, diarrhoea, low back pain, sciatica, IBS.
Local point for lumbar patterns as well as systemic LI treatment.
Needling technique
Perpendicular 1.0–1.5 cùn. Deeper insertion (up to 2 cùn) is used clinically for sciatica.
Moxibustion
Warms cold-type diarrhoea and cold in the lumbar region.
Cautions
Deep needling near the sciatic distribution — avoid provoking radicular pain.
Classical pairings
- ST-25 Tiān Shū — Front-Mù of the Large Intestine
- LI-4 Hé Gǔ — Yuán-source of the Large Intestine
- GB-30 Huán Tiào — combined for sciatica
Open in the point database
View live location diagrams, additional research citations and full needling metadata for BL-25.
Open BL-25 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.