BL51 Vitals Gate

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

BL51 (Huangmen, “Vitals Gate”) is an acupuncture point on the Bladder Meridian. It is located on the back, 3 cun lateral to the posterior midline, at the level of the lower border of the spinous process of the 2nd lumbar vertebra (L2). This point is located 1.5 cun lateral to BL23. It regulates qi, alleviates pain, treats breast disorders.

Location

On the back, 3 cun lateral to the posterior midline, at the level of the lower border of the spinous process of the 2nd lumbar vertebra (L2). This point is located 1.5 cun lateral to BL23.

Needling

Perpendicular or oblique insertion 0.8-1.2 cun. Caution: pneumothorax.

⚠ Pneumothorax risk: oblique/shallow only, never deep perpendicular over the chest wall.

TCM functions

Regulates qi, alleviates pain, treats breast disorders.

Indications

Abdominal pain, constipation, mammary carbuncle.

Clinical notes

Huangmen, 'Vitals Gate,' is a versatile point known for its ability to regulate qi and alleviate pain, particularly in the chest and hypochondriac regions. It has a notable empirical use for treating breast disorders, including mastitis, breast pain, and lumps, making it a valuable point in women's health. It can also address local back pain. It is often used with GB21 (Jianjing) for breast conditions.

On the Bladder channel

BL51 is one of 67 points on the Bladder Meridian. Nearby points:

Frequently asked questions

Where is BL51 located?

BL51 (Huangmen) is located on the back, 3 cun lateral to the posterior midline, at the level of the lower border of the spinous process of the 2nd lumbar vertebra (L2). This point is located 1.5 cun lateral to BL23.

What is BL51 used for?

BL51 regulates qi, alleviates pain, treats breast disorders. Common clinical indications include abdominal pain, constipation, mammary carbuncle.

How is BL51 needled?

Perpendicular or oblique insertion 0.8-1.2 cun. Caution: pneumothorax. Caution: ⚠ Pneumothorax risk: oblique/shallow only, never deep perpendicular over the chest wall.

Which meridian is BL51 on?

BL51 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.