BL34 Lower Bone-Hole

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

BL34 (Xialiao, “Lower Bone-Hole”) is an acupuncture point on the Bladder Meridian. BL34 is in the 4th posterior sacral foramen, inferior to BL33. It regulates menstruation, stops leucorrhea, benefits urination, strengthens the back and legs.

Location

BL34 is in the 4th posterior sacral foramen, inferior to BL33.

Needling

Perpendicular insertion 0.8-1.2 cun.

⚠ Pregnancy: avoid — may stimulate uterine contraction (miscarriage / early-labour risk).

TCM functions

Regulates menstruation, stops leucorrhea, benefits urination, strengthens the back and legs.

Indications

Irregular menstruation, leucorrhea, dysuria, constipation, low back pain.

Clinical notes

Xialiao is the lowest of the Ba Liao points and is particularly effective for conditions of the lower abdomen, genitourinary system, and lower back. It excels at regulating menstruation, stopping leucorrhea, and benefiting urination, making it a go-to point for gynecological pain, infertility, and urinary dysfunction. It is frequently used with other Ba Liao points to enhance their collective impact on the pelvic region and sacrum.

On the Bladder channel

BL34 is one of 67 points on the Bladder Meridian. Nearby points:

Frequently asked questions

Where is BL34 located?

BL34 is in the 4th posterior sacral foramen, inferior to BL33.

What is BL34 used for?

BL34 regulates menstruation, stops leucorrhea, benefits urination, strengthens the back and legs. Common clinical indications include irregular menstruation, leucorrhea, dysuria, constipation, low back pain.

How is BL34 needled?

Perpendicular insertion 0.8-1.2 cun. Caution: ⚠ Pregnancy: avoid — may stimulate uterine contraction (miscarriage / early-labour risk).

Which meridian is BL34 on?

BL34 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.