Bladder 20 (BL 20) Pi Shu — Spleen Shu

This is the Back-Shu point of the Spleen. It is the principal back point for tonifying and strengthening the Spleen, resolving damp and supporting digestion and the blood.

Bladder 20 (BL 20) Pi Shu 脾俞 — Spleen Shu

Location

On the back, 1.5 cun lateral to the lower border of the spinous process of the eleventh thoracic vertebra (T11).

Anatomy

On the latissimus dorsi, over the erector spinae; the posterior intercostal artery; the dorsal rami of the thoracic nerves.

Actions & Functions

  • Tonifies and strengthens the Spleen and Stomach (Back-Shu of the Spleen)
  • Resolves dampness
  • Supports the production and control of blood

Indications

Poor appetite, abdominal distension, loose stools and diarrhoea, fatigue and weakness, oedema, and blood deficiency or chronic bleeding.

Needling

0.5-0.7 cun, oblique insertion towards the spine.

Moxibustion Suitability

Highly suitable - moxa strengthens the Spleen yang.

Point Combinations

With BL-21 and ST-36 to strengthen the Spleen and Stomach; with BL-17 to tonify blood.

Classical Text References

The Back-Shu point of the Spleen.

Cautions & Contraindications

Deep perpendicular insertion risks injury to the kidney/lung; needle obliquely.

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.