Da Chang Shu (BL25)
📍 Location
On the lower back, below the spinous process of the 4th lumbar vertebra, 1.5 cun lateral to the midline.
🏥 Indications
Back-shu point of the large intestine: chronic constipation, diarrhea, distension, sciatica, and lumbosacral pain; the key posterior point for bowel regulation.
🖐️ Stimulation method
Perpendicular insertion 0.8–1.2 cun or oblique outward; moxibustion for cold diarrhea.
⚠️ Contraindications
Use caution in lumbar injuries; insert to a moderate depth.