BL55 Confluence of Yang

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

BL55 (Heyang, “Confluence of Yang”) is an acupuncture point on the Bladder Meridian. It is located on the posterior aspect of the thigh, 2 cun inferior to BL54 (Weizhong), between the two heads of the gastrocnemius muscle. It relaxes sinews, invigorates channels, alleviates pain.

Location

On the posterior aspect of the thigh, 2 cun inferior to BL54 (Weizhong), between the two heads of the gastrocnemius muscle.

Needling

Perpendicular insertion 1 to 1.5 cun. Caution for sciatic nerve.

⚠ Major vessel/nerve nearby — palpate first; avoid deep insertion (near the sciatic nerve).

TCM functions

Relaxes sinews, invigorates channels, alleviates pain.

Indications

Low back pain, pain in the leg, paralysis of the lower extremities.

Clinical notes

Heyang is primarily used for local conditions of the posterior thigh and knee, particularly muscle spasms, pain, and stiffness in the hamstrings and gastrocnemius. It is also effective for sciatica and lower back pain radiating down the leg. While not a commonly used point, it can be a valuable adjunct for sinew problems in its vicinity.

On the Bladder channel

BL55 is one of 67 points on the Bladder Meridian. Nearby points:

Frequently asked questions

Where is BL55 located?

BL55 (Heyang) is located on the posterior aspect of the thigh, 2 cun inferior to BL54 (Weizhong), between the two heads of the gastrocnemius muscle.

What is BL55 used for?

BL55 relaxes sinews, invigorates channels, alleviates pain. Common clinical indications include low back pain, pain in the leg, paralysis of the lower extremities.

How is BL55 needled?

Perpendicular insertion 1 to 1.5 cun. Caution for sciatic nerve. Caution: ⚠ Major vessel/nerve nearby — palpate first; avoid deep insertion (near the sciatic nerve).

Which meridian is BL55 on?

BL55 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.