Upper Arm Shu (SI-10) Pressure Point: Benefits & Technique

The Upper Arm Shu pressure point (SI-10) is a shoulder acupressure point on the back of the shoulder, just above SI-9 (Jianzhen), commonly used to support shoulder and upper-arm pain, stiffness, swelling, and weakness.

In Traditional Chinese Medicine (TCM), SI-10 is called Naoshu (“Upper Arm Shu”). It belongs to the Small Intestine (Hand Taiyang) meridian and is also described as a meeting/crossing point involving Taiyang channels and extraordinary vessels (often referenced with Yang Linking and Yang Motility vessel relationships). In practical terms, that classical description aligns with how clinicians use SI-10: as a local “junction” point to help restore smoother movement and reduce discomfort around the shoulder joint and upper arm.

Summary Table

Attribute	Details
Pressure Point Name	SI-10 – Upper Arm Shu (Naoshu)
Body Area	Shoulder
Exact Location	Posterior shoulder, in a depression just below the scapular spine and near the outer edge of the acromion; above SI-9 (Jianzhen)
Common Uses	Shoulder/upper-arm pain, stiffness, swelling, weakness; mobility limitation
Stimulation Technique	Firm thumb or finger pressure, 1–3 minutes
Contraindications	Avoid aggressive/deep pressure over irritated nerves/vessels; caution with bleeding disorders or anticoagulants; stop if sharp pain, tingling, or numbness occurs

Clinical Significance of the Upper Arm Shu Pressure Point (SI-10)

Clinically, SI-10 is most relevant when symptoms cluster around the posterior-lateral shoulder—especially when discomfort is provoked by lifting the arm to the side (abduction) or reaching overhead.

From a combined modern + TCM lens, SI-10 is commonly considered when there is:

• Local shoulder pain or myofascial tenderness near the deltoid–supraspinatus region
• Stiffness (reduced range of motion), including patterns that resemble “Pain Obstruction” (Bi syndrome) in TCM
• Swelling or heaviness in the upper arm/shoulder region (often described in TCM as impaired Qi and blood circulation in the channel)
• Weakness or fatigue with shoulder use (sometimes accompanying protective muscle guarding)

Anatomically, SI-10 sits near tissues that often contribute to shoulder symptoms:

• Deltoid and supraspinatus region (common sites of overload/tension)
• Nearby neural structures (commonly discussed clinically: axillary and suprascapular nerve neighborhoods), which is one reason technique should be steady and not overly aggressive

Location (How to Find SI-10)

SI-10 is on the back of the shoulder, in a small depression just under the bony ridge of the shoulder blade (scapular spine) and near the outer shoulder tip (acromion).

A reliable way to locate it:

1. Position your arm: slightly raise your arm out to the side (about 30–60 degrees) to make the shoulder structures easier to feel.
2. Find SI-9 first: locate SI-9 (Jianzhen) at the back of the shoulder near the posterior armpit fold.
3. Slide upward: from SI-9, move your fingers upward (toward the top of the shoulder) until you feel a shallow hollow just below the scapular spine and near the acromion’s back edge.
4. Confirm by palpation: the point often feels like a tender notch or “soft spot” between firm structures (bone and muscle).

Practical landmark cues (no measuring tools needed):

• It’s typically 1–2 finger-widths above SI-9 for many bodies (variation is normal).
• It sits at about shoulder-joint level on the back side, where the upper arm meets the shoulder blade.

How to Stimulate It (Acupressure Technique)

Goal: steady, firm pressure that feels “comfortably intense,” not sharp.

Position options

• Seated: Sit upright. Let the working shoulder relax down (avoid shrugging).
• Arm position: Slight abduction (arm gently out to the side) often makes SI-10 easier to access.

Technique (standard)

1. Place your thumb pad (or index/middle finger pad) on the tender depression of SI-10.
2. Press inward and slightly toward the shoulder joint (not toward the chest).
3. Hold steady pressure for 1–3 minutes, breathing slowly.
4. Release gradually, then reassess shoulder comfort and range of motion.

Pressure level

• Aim for moderate to firm pressure (around a 5–7/10 intensity).
• Avoid “digging” with the fingertip; use the pad to reduce irritation.

Frequency

• For short-term flare-ups: 1–2 sessions daily for several days may be reasonable.
• For stiffness and mobility work: 3–5 days per week, paired with gentle shoulder movement, is often more sustainable than frequent hard pressure.

Helpful pairings (common clinical combinations)

• Local shoulder support: SI-9 (Jianzhen), LI-14 (Binao)
• Overhead motion and shoulder opening: (commonly paired clinically) LI-15, TE-14
• Elbow/arm tension patterns: LI-11 is often used adjunctively in acupuncture traditions

If you’re building a short routine, I typically suggest: SI-10 → SI-9 → LI-14, then gentle shoulder circles (pain-free range).

Benefits and Common Uses

SI-10 is best known for local shoulder and upper-arm support. In both acupressure and acupuncture traditions, it’s used to “open” the shoulder region and reduce guarding.

Common uses include:

• Shoulder pain and soreness (posterior or lateral shoulder)
• Stiffness and reduced range of motion, including patterns resembling frozen-shoulder-type restriction (as part of a broader plan)
• Upper-arm heaviness, swelling, or fatigue, particularly after overuse
• Weakness or inhibited shoulder function, when pain and tension limit activation

TCM interpretation (how practitioners describe its actions):

• Moves Qi and blood in the Small Intestine channel around the shoulder
• Helps relieve channel obstruction consistent with Bi syndrome presentations (pain, stiffness, heaviness)
• Supports the shoulder as a confluence area where multiple Yang pathways are discussed in classical texts

If your symptoms resemble adhesive capsulitis, see our targeted guide: Acupressure Points for Frozen Shoulder Relief.

Physiological Functions & Mechanisms (What May Be Happening)

Direct, point-specific research on SI-10 is limited. Still, several plausible mechanisms are consistent with broader acupressure and pain-science frameworks:

• Myofascial modulation: Firm, sustained pressure may help downshift local muscle tone in the deltoid/supraspinatus region, reducing protective guarding.
• Neuromodulation (“gating”): Pressure stimulation can influence local sensory input, which may alter pain signaling in the short term.
• Local circulation effects: Rhythmic pressure and release may temporarily increase local blood flow and tissue fluid exchange—often perceived as reduced “stiffness” after treatment.
• TCM channel regulation: In TCM terms, SI-10 is used to improve Qi and blood flow through the Taiyang network around the shoulder, which is why it’s commonly paired with adjacent shoulder points.

Importantly, these are inferred mechanisms rather than SI-10-specific proven effects.

Practitioner Insight (brief, first-person)

In practice, I find SI-10 is most useful when people can’t comfortably raise the arm to the side without a “catch” in the back/outer shoulder. A small adjustment that often helps: keep the shoulder relaxed and down while pressing—if the person shrugs, the point can feel sharper and less effective.

Safety & Contraindications

Acupressure at SI-10 is generally low-risk when done gently, but the shoulder contains important nerves and blood vessels, and the area can be sensitive—especially after injury.

Use caution if you have:

• A recent shoulder injury, suspected tear, dislocation, or fracture
• Significant bruising, swelling, heat, or redness (evaluate for acute inflammation/infection)
• Bleeding disorders or you take anticoagulant/antiplatelet medications (pressure may increase bruising risk)
• Radiating symptoms (numbness/tingling down the arm) that worsen with pressure—stop and seek clinical assessment

Technique precautions:

• Avoid aggressive “digging” or deep, forceful pressure.
• If you feel sharp pain, electric sensations, numbness, or increasing tingling, stop immediately.

For broader guidance, see our acupressure safety guide and our acupressure education hub. As always, listen to your body and stop if discomfort arises.

Related Points & Techniques

SI-10 is often more effective as part of a small shoulder protocol rather than used alone.

Related acupressure points (internal library links)

• True Shoulder (SI-9) Pressure Point: local posterior shoulder support; commonly paired with SI-10
• Upper Arm (LI-14) Pressure Point: upper-arm and shoulder tension patterns
• Heavenly Palace (LU-3) Pressure Point: upper arm/anterior-lateral arm tightness patterns that can co-exist with shoulder limitation
• Cyan Spirit (HT-2) Pressure Point: medial upper-arm tension patterns (useful when arm discomfort is diffuse)

Adjunct techniques (simple, evidence-informed additions)

• Breathing down-regulation: 4–6 slow breaths while holding SI-10 can reduce guarding and make pressure more tolerable.
• Gentle mobility after pressure: try 5–10 slow shoulder circles or wall-assisted slides in a pain-free range.
• Heat therapy: a warm compress for 5–10 minutes before acupressure may improve comfort for stiff shoulders (avoid heat on acute inflammation).

Scientific Perspective

There is no strong, SI-10-specific clinical trial evidence currently available in major biomedical databases. Most guidance for SI-10 comes from TCM classical indications and modern clinical protocols for shoulder pain.

For readers who want an evidence-oriented context, research on acupuncture/acupressure for musculoskeletal pain more broadly suggests potential benefit for some pain conditions, though results vary by condition and study quality. You can explore overviews and safety considerations via the NIH National Center for Complementary and Integrative Health’s acupuncture guidance and shoulder-related acupuncture research summaries available through PubMed (both are useful starting points for clinicians and careful self-care users).