Small Intestine 4 (SI 4) Wan Gu — Wrist Bone

This is the Yuan-Source point of the Small Intestine channel. It resolves damp-heat, benefits the sinews and is used for jaundice and wrist disorders.

Small Intestine 4 (SI 4) Wan Gu 腕骨 — Wrist Bone

Location

On the ulnar border of the hand, in the depression between the base of the fifth metacarpal bone and the triquetral bone, at the border of the red and white skin.

Anatomy

On the abductor digiti minimi; the dorsal carpal branch of the ulnar artery; the dorsal branch of the ulnar nerve.

Actions & Functions

  • Resolves damp-heat and benefits the gall bladder (jaundice)
  • Clears heat and benefits the sinews
  • Benefits the wrist and fingers

Indications

Jaundice, headache, stiff neck, tinnitus, febrile disease, diabetes (wasting and thirsting), and pain and contracture of the wrist and fingers.

Needling

0.3-0.5 cun, perpendicular insertion.

Moxibustion Suitability

Suitable for moxibustion.

Point Combinations

With LV-3 and GB-34 for jaundice; with SI-3 for neck and wrist disorders.

Classical Text References

The Yuan-Source point of the Small Intestine, classically used for jaundice.

Cautions & Contraindications

None specific.

Latest Research

Latest peer-reviewed research on this point will be summarised here, with citations linked to PubMed, via our research integration.

About Attilio

Doctor of Chinese medicine, acupuncture expert and author of My Fertility Guide and My Pregnancy Guide.

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PubMed research

Acupuncture Shows Sustained Benefits for Chronic Daily Headache Prevention in Adults, Meta-Analysis Finds

Research summary (Acupuncture): Utility of Acupuncture Therapy for Adult Chronic Daily Headache Prophylaxis: A Systematic Review and Meta-Analysis. - Medical science monitor : international medical journal of experimental and clinical research, 2026.