San Jiao 9 (SJ 9) Si Du — Four Rivers

This point, on the forearm, benefits the ears and throat and relieves pain of the forearm.

San Jiao 9 (SJ 9) Si Du 四瀆 — Four Rivers

Location

On the dorsal aspect of the forearm, 5 cun distal to the olecranon, between the radius and ulna.

Anatomy

Between the radius and ulna, on the extensor muscles; the posterior interosseous artery; the posterior antebrachial cutaneous nerve and the posterior interosseous nerve.

Actions & Functions

  • Benefits the ears and throat
  • Activates the channel and stops pain

Indications

Sudden deafness, toothache, sore throat, sudden loss of voice, and pain of the forearm.

Needling

0.5-1.0 cun, perpendicular insertion.

Moxibustion Suitability

Suitable for moxibustion.

Point Combinations

With SJ-17 for deafness; with SJ-8 for loss of voice.

Classical Text References

Used for disorders of the ears, throat and forearm.

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

Network Meta-Analysis Finds Chinese Herbal Decoctions Improve Outcomes and Reduce Side Effects in Breast Cancer Treatment

Research summary (Traditional Chinese Medicine): Efficacy and safety of traditional Chinese medicine decoctions in breast cancer treatment: a network meta-analysis. - Frontiers in oncology, 2026.