Lesser Marsh (SI-1) Pressure Point: Benefits & Technique

In clinical acupressure, the Lesser Marsh pressure point is most often used to support sore throat and heat-type head/neck discomfort by stimulating the Small Intestine meridian at the tip of the little finger. It may also be used traditionally to support lactation when low milk supply is part of a broader pattern.

Also written as SI-1, this point is known in Traditional Chinese Medicine (TCM) as Shaoze (“Lesser Marsh”). It’s the Jing-Well point of the Small Intestine (Hand Taiyang) channel, a category of points traditionally used to “open the channel,” clear excess Heat, and influence the upper body (head/neck) via distal stimulation.

Image Prompt: Black line illustration of a human Hand showing the location of Lesser Marsh. Minimalist and educational style.
Image Title: SI-1 Pressure Point Location on the Hand
Alt Text: Black line diagram showing SI-1 pressure point on the Hand

Summary Table

Attribute	Details
Pressure Point Name	SI-1 – Lesser Marsh (Shaoze)
Body Area	Hand (little finger)
Exact Location	Ulnar side of the little finger, about 1–2 mm from the nail corner
Common Uses	Headache patterns with “heat,” sore throat/tonsil discomfort, low milk supply (traditional use)
Stimulation Technique	Firm thumb or finger pressure, 1–3 minutes
Contraindications	Use caution in pregnancy; avoid pressing on infected/irritated skin or if bleeding risk is high

Clinical Significance & Associated Conditions

SI-1 is classically indicated for conditions that travel along the Small Intestine channel pathway (ulnar hand/arm → shoulder/scapula → neck/face → ear region). In modern terms, it’s commonly selected as a distal point to influence symptoms in the head/neck and along the posterior-lateral upper body.

Common clinical scenarios where practitioners may include SI-1 – Shaoze (Lesser Marsh) in a plan:

• Sore throat and tonsil discomfort (especially when symptoms feel “hot,” swollen, or acute)
• Headache patterns that present with heat signs (red face/eyes, irritability, feverish sensation) in TCM language
• Neck stiffness or upper-back/shoulder tightness along the channel line (as part of a broader protocol)
• Insufficient lactation (traditional indication; typically combined with other breast/chest-supporting points and lifestyle measures)

From a TCM perspective, SI-1 is used to help:

• Clear Wind-Heat from the Exterior (acute upper respiratory-type presentations)
• Open the channel to reduce pain and constraint along the meridian
• Support the channel’s relationship with the Heart (paired dynamics in classical theory)

Location

To locate SI-1 – Shaoze (Lesser Marsh) accurately:

• Use the little finger (5th finger).
• Find the ulnar side of the nail (the side closest to the ring finger is radial; the side closest to the outside edge of the hand is ulnar).
• SI-1 sits right next to the nail corner on the ulnar side, about 1–2 mm from the corner where the nail meets the skin.
• It’s on the distal phalanx, where the tissue is thin and the point can feel quite sensitive.

Practical measuring tip (no special tools):

• “1–2 mm” is roughly the thickness of a credit card edge; you’re essentially working at the nail corner margin, not mid-finger.

How to Stimulate It

Because SI-1 is at the fingertip near the nail, the best approach is steady, controlled pressure rather than aggressive rubbing.

Standard acupressure technique

1. Relax your hand on a table or your lap, palm facing inward or down—whichever keeps the little finger relaxed.
2. Use the thumb or index finger of the opposite hand to press the point at the ulnar nail corner.
3. Apply firm but tolerable pressure (aim for a “strong pressure” sensation, not sharp pain).
4. Hold for 1–3 minutes while breathing slowly.
5. Repeat 2–3 times daily as needed for short-term support.

Pressure and angle

• Start with a 90° (perpendicular) press into the tissue beside the nail.
• If it feels too sharp, shift to a slightly angled press toward the base of the finger to reduce nail-edge sensitivity.

What you should feel

• Local tenderness, warmth, or a mild “zingy” fingertip sensation can be normal.
• Stop if you feel intense sharp pain, numbness, or lingering irritation around the nail fold.

Pairing guidance

• For head/face patterns, SI-1 is often paired with points on the head/neck or other “heat-clearing” points, depending on presentation (see “Related Points & Techniques” below).

Benefits and Common Uses

The effects below reflect traditional indications and common clinical use patterns; SI-1 has limited point-specific modern trial data, so benefits are best understood as plausible and experience-based rather than definitively proven.

Headache support (especially “heat” presentations)

The Lesser Marsh pressure point may help when headache is accompanied by:

• a hot or flushed feeling
• eye redness
• a tight neck/upper back component
• acute onset with a “wind-heat” style pattern in TCM

If your headache is more associated with sinus congestion, you may also explore Head Corner (ST-8), which is commonly used for head pain patterns on the scalp.

Sore throat / tonsil discomfort

SI-1 is traditionally used for throat pain, swelling, and febrile presentations. Many practitioners combine it with points that address the throat region more directly, such as Heavenly Tripod (LI-17).

Insufficient lactation (traditional use)

In TCM, Jing-Well points can influence channel flow and “open” pathways. SI-1 is classically listed for insufficient lactation, typically as part of a broader plan (hydration, feeding mechanics, stress reduction, and complementary points).

For additional heat-clearing support from the hand, some protocols also use Fish Border (LU-10) or Lesser Shang (LU-11), depending on the pattern.

Physiological Functions & Mechanisms

Point-specific mechanisms for SI-1 have not been well established in modern biomedical research. Still, a reasonable, evidence-informed explanation for acupressure effects includes:

• Cutaneous and periosteal stimulation: The area near the nail has dense sensory innervation and thin soft tissue over bone, which can create a strong afferent sensory signal with pressure.
• Segmental and suprasegmental modulation: Like other acupressure inputs, stimulation may influence pain processing through peripheral sensory input and central modulation (often discussed broadly in acupressure/acupuncture literature).
• TCM channel effects: As a Jing-Well point, SI-1 is traditionally described as helping to “clear Heat” and “open the channel,” which is why it’s selected for acute, upper-body symptoms.

If you want a deeper look at how acupressure is explained in integrative medicine settings, the NIH’s National Center for Complementary and Integrative Health provides a helpful overview via its resources on acupuncture and related modalities (see NCCIH’s acupuncture overview).

Practitioner Insight (first-person allowed here only)

In practice, I find SI-1 works best when it’s treated as a quick, precise “switch” point—short sessions, very accurate placement, and paired with slow breathing. If someone presses too hard or too long at the nail fold, the local sensitivity can overshadow the intended calming effect, so I cue a firm-but-clean pressure and stop as soon as the area feels irritated.

Safety & Contraindications

SI-1 is generally low risk when used as gentle acupressure, but it’s located in a sensitive area.

Use caution or avoid acupressure at SI-1 if:

• Pregnancy: traditional guidance often advises caution with points that strongly move qi/blood; consult your clinician before use.
• Local infection or inflammation: paronychia, open cuts, skin cracking, or active dermatitis around the nail.
• Bleeding disorders or anticoagulant use: fingertip tissues can bruise or bleed more easily if overstimulated.
• Neuropathy or reduced sensation: you may not feel excessive pressure, increasing risk of skin irritation.

For broader guidance, review our acupressure safety guide and explore more techniques in our acupressure category.
As always, listen to your body and stop if discomfort arises.

Related Points & Techniques

SI-1 is rarely used alone in clinical-style acupressure. Consider these complementary options (selected based on your pattern and symptoms):

• For throat discomfort: combine with LI-17 – Tianding (Heavenly Tripod) and gentle neck relaxation.
• For heat-type sore throat: add LU-11 – Shaoshang (Lesser Shang) or LU-10 – Yuji (Fish Border) as appropriate.
• For headache patterns: pair with ST-8 – Touwei (Head Corner) when pain localizes to the head/scalp.
• Breathing technique (adjunct): inhale for 4 seconds, exhale for 6–8 seconds while holding SI-1; this can reduce guarding and improve tolerance.
• Gentle tapping option: if direct pressure is too sharp, lightly tap the point area for 20–30 seconds, then return to softer sustained pressure.

Scientific Perspective

At this time, there is insufficient high-quality, point-specific clinical research isolating SI-1 (Shaoze) for headache, sore throat, or lactation outcomes. Most support for SI-1 comes from classical TCM indications and modern clinical tradition rather than randomized controlled trials.

For readers who want to explore the broader evidence base:

• Search the biomedical literature via the PubMed database using terms like “Shaoze SI-1” or “Small Intestine meridian acupuncture.”
• For safety, indications, and how acupuncture/acupressure is evaluated in integrative care, see the NIH NCCIH guidance on acupuncture.
• The World Health Organization’s acupuncture indications document is often referenced historically, though it does not validate every individual point claim and should be interpreted cautiously.