Cheng Shan (BL57)
📍 Location
On the posterior midline of the lower leg, in the V-shaped angle below the two heads of the gastrocnemius when the heel is lifted, midway between Weizhong and the Achilles tendon.
🏥 Indications
Calf cramps, low-back and knee pain, hemorrhoids, constipation, and heavy legs.
🖐️ Stimulation method
Perpendicular insertion 1.0–2.0 cun. Firm pressure helps nocturnal calf cramps and hemorrhoid discomfort.
⚠️ Contraindications
Use caution where varicose veins are prominent at the site.