Bladder

BL25

大肠俞 · Dachangshu

Large Intestine Shu

Low-back point for the large intestine shu and local ache.

Back-shu of the Large Intestine

System

Channel: Bladder (BL)
Element: Water
Yin or yang: yang
Organ system: Bladder
Region: Back
Limb rule: Foot Taiyang

Open the Bladder page

Where it is

Low back, two finger-widths lateral to the spine, about level with the fourth lumbar vertebra — a little below the waist, near the top of the hip bone.

Nearby: Lumbar muscles. The bowel is anterior. Press muscle, not the spine.

Traditionally said to

Back-shu of the Large Intestine. Taught for low-back ache and for bowel patterns together with ST25.

What people look up

Pain relief Digestion Local muscle tension Low back Constipation

Acupressure

Palm on the muscle, 45–60 seconds, both sides.

When not to press: Pain with leg numbness, saddle numbness, or bowel/bladder loss of control is an emergency.

About 30–90 seconds is the usual window, unless the step above is shorter. Stop if pain, dizziness, or anything unusual shows up.

Licensed practice only

Needle depth, angle, electroacupuncture

Textbook language for students. Not instructions. A cun is a body-inch on that person, not a ruler inch. Do not needle yourself.

Depth

Common textbook range: about 0.8–1.2 cun perpendicular.

Angle

Perpendicular, into the lumbar muscle.

Electroacupuncture

Introductory charts rarely assign a standard electroacupuncture setting here. Clinics that use current choose frequency and intensity for that person. No milliamp figure is given, because copying one would be misleading.