BL32 Second Crevice

Reviewed by · Licensed Acupuncturist & TCM Physician · Last reviewed June 2026

BL32 (Cì Liáo, “Second Crevice”) is an acupuncture point on the Bladder Meridian. BL32 is located in the second posterior sacral foramen, medial to the posterior superior iliac spine. It regulates menstruation, alleviates pain, and benefits the genitourinary system.

Location

BL32 is located in the second posterior sacral foramen, medial to the posterior superior iliac spine.

Needling

Perpendicular insertion 1.0 to 1.5 cun. Exercise caution to avoid deep insertion, especially in thin patients.

⚠ Pregnancy: avoid — may stimulate uterine contraction (miscarriage / early-labour risk).
⚠ Reduce depth in thin patients — avoid deep perpendicular insertion.

TCM functions

Regulates menstruation, alleviates pain, and benefits the genitourinary system.

Indications

Dysmenorrhea, irregular menstruation, leucorrhea, lower back pain, sciatica, impotence.

Clinical notes

One of the 'Eight Liao' points, BL32 is renowned for its powerful action on regulating menstruation, alleviating pain, and benefiting the genitourinary system. It is a primary point for dysmenorrhea, irregular menstruation, infertility, and various gynecological disorders. It is also highly effective for sciatica, lower back pain, and conditions of the sacrum and hips, often used with electroacupuncture for pelvic pain and urinary incontinence.

On the Bladder channel

BL32 is one of 67 points on the Bladder Meridian. Nearby points:

Frequently asked questions

Where is BL32 located?

BL32 is located in the second posterior sacral foramen, medial to the posterior superior iliac spine.

What is BL32 used for?

BL32 regulates menstruation, alleviates pain, and benefits the genitourinary system. Common clinical indications include dysmenorrhea, irregular menstruation, leucorrhea, lower back pain, sciatica, impotence.

How is BL32 needled?

Perpendicular insertion 1.0 to 1.5 cun. Exercise caution to avoid deep insertion, especially in thin patients. Caution: ⚠ Pregnancy: avoid — may stimulate uterine contraction (miscarriage / early-labour risk). ⚠ Reduce depth in thin patients — avoid deep perpendicular insertion.

Which meridian is BL32 on?

BL32 is a point on the Bladder Meridian (Zú Tài Yáng Páng Guāng Jīng).

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⚠️ This page is for general education and is not medical advice. Acupuncture is a traditional practice; evidence varies by condition and study quality, and individual results differ. It does not replace diagnosis or treatment by a licensed professional. Always consult a qualified acupuncturist or physician.