Shaoze

What is SI1?

SI1 (Shaoze) is the first point of the Small Intestine channel, sitting at the outer corner of the little fingernail. Its Chinese name means "Lesser Marsh".

In classical acupuncture SI1 is a jing-well point — the small points at the fingertips and toe-tips where a channel is said to begin or end. These points are taught in every acupuncture curriculum, so SI1 has a high standing within tradition. It is best known in that tradition for breast and milk-flow complaints, for fever and sore throat, and as one of the finger points used in old first-aid texts for collapse or fainting.

Two things are worth saying once, clearly, at the start. Traditional standing is not evidence that a point works, and age alone does not make a point safe. A technique can be two thousand years old and still do nothing, or still be a bad idea for a particular person.

The honest verdict on the evidence: weak. SI1 appears in some acupuncture research on low milk supply and on breast inflammation, but almost always as one point inside a larger formula, delivered by needles rather than fingers. That makes it impossible to say what SI1 itself contributed. There are no good trials of self-applied finger pressure on SI1 for anything.

What SI1 does offer a reader is a point that is easy to find, easy to reach on yourself, and low risk for most people — a small patch of skin beside a fingernail. Pressing it is unlikely to harm you if your skin is intact and you do not dig in with a nail. It is reasonable to treat it as a comfort or self-care habit, not as a treatment. If you have a specific problem in mind — a blocked duct, a painful breast, a fever — SI1 is not the thing that should decide what you do next.

Where is SI1 and how do you find it?

SI1 sits beside the outer corner of your little fingernail, on the side facing away from your thumb, about 2 mm from the nail edge.

• Start with the right finger. SI1 is on the little finger (the fifth finger), not the ring finger. Each hand has its own SI1.
• Find the outer corner of the nail. Hold your hand palm-down. The outer corner is the one on the pinky side of your hand, away from the thumb. In anatomy this is called the ulnar side.
• Step back from the corner. Classical texts place SI1 about 0.1 cun from the nail corner. That is roughly the width of a matchstick — about 1 to 2 mm, a hair's breadth back and to the side.
• Feel for the junction. The spot is where the hard nail edge meets the softer skin of the nail fold. You can usually feel a slight step or ridge under your fingertip.
• Check by touch sensitivity. Fingertip skin is richly supplied with nerves, so the area feels alert and sometimes tender. Tenderness is normal here and does not mean you have found something wrong.

If you draw an imaginary line up the outer edge of the little finger and a second line across the base of the nail, SI1 sits where those two lines cross. That crossing-point method is the standard way to locate all the nail-corner points, and it works on anyone's hand regardless of finger size.

A common source of confusion is the neighbouring point at the inner corner of the same nail, nearer the ring finger. That is a different channel's point. SI1 is specifically the outer corner — the little-finger side of the little finger.

This library covers finger pressure only. Nothing on this page involves needles, depth or skin-breaking of any kind.

How do you apply pressure to SI1?

1. Wash and check the skin. Clean hands, and look at the nail fold. If the skin is broken, red, swollen or weeping, leave it alone entirely.
2. Use a soft pinch. Place the pad of your thumb on SI1 and the pad of your index finger on the opposite side of the little fingertip. Squeeze gently, so the pressure is held between two finger pads.
3. Keep nails out of it. Use the fleshy pad, never a nail edge. Digging a nail into the nail fold can tear skin and invite infection.
4. Judge the strength. Aim for firm but comfortable — around a 3 or 4 out of 10. Fingertips are sensitive, so this is much lighter than you would use on a shoulder.
5. Hold for 30 to 60 seconds. You can hold steadily or use small circles. Breathe normally and keep the shoulder and wrist relaxed.
6. Repeat and swap sides. Two or three rounds per hand is plenty. Most people do both hands.
7. Space it out. Once or twice a day is a sensible ceiling. More is not better, and repeated squeezing of the same patch of skin can make it sore.

When to stop. Stop straight away if you get sharp pain, numbness, pins and needles travelling up the finger, or if the skin goes white, red or marks easily. Stop if the nail fold becomes tender afterwards and give it several days off.

Do not press SI1 while driving, carrying a baby one-handed, or doing anything where a sudden jolt of discomfort would be a problem. It is a quiet, seated activity.

If you are using SI1 alongside breastfeeding, keep it separate from feeding and expressing. Pressing a fingertip is not a substitute for draining the breast, which is the part that actually matters for a blocked duct.

What is SI1 traditionally used for?

• Low milk supply. This is SI1's best-known traditional use, and the reason most readers arrive at the point. Acupuncture studies on insufficient lactation have sometimes included SI1, but nearly always inside a multi-point formula, with needles, and in small unblinded trials. No study has tested finger pressure on SI1 alone, so no honest claim can be made about it.
• Blocked ducts and breast inflammation. Tradition frames SI1 as a point for breast heat and swelling, because the Small Intestine channel is described as relating to the breast region. Human research on acupuncture for mastitis is limited and mixed, and the points used varied between studies. Frequent feeding or expressing, rest and medical review remain the mainstays.
• Fever and sore throat. Jing-well points as a group were classically used to "clear heat". There is no controlled human evidence that pressing SI1 lowers a temperature or shortens a sore throat.
• Eye complaints and blurred vision. Older texts list SI1 for red, sore or dim eyes. This claim has no supporting human research at all and should be read as tradition only.
• Fainting and collapse. Classical first-aid texts list finger-tip points, including SI1, for loss of consciousness. This is historical practice, not a treatment. Anyone who collapses needs emergency help, not a pressed fingertip.
• Headache and stiff neck on the pinky side. Because the channel runs up the outer arm to the neck and face, SI1 is sometimes used for pain along that line. Evidence for distal acupressure on headache is weak, short-term and easily explained by expectation and touch.

Across all of these, the pattern is the same: strong traditional standing, almost no direct human evidence for SI1 specifically. A pleasant, low-risk self-care habit is a fair description. A treatment is not.

Are there tips for using SI1 effectively?

• Get the corner right before you press. Spend ten seconds confirming you are on the outer corner of the little fingernail, away from the thumb. People routinely drift to the inner corner, which belongs to a different channel.
• Pinch rather than poke. Supporting the fingertip from both sides gives you control and stops you from jamming a nail into the skin. It also feels steadier.
• Warm your hands first. Cold fingertips are less sensitive and more easily bruised. A minute under warm water makes the point easier to locate.
• Set a timer rather than counting. Thirty to sixty seconds feels much longer than it is. A timer stops you from over-pressing a small patch of skin.
• Keep nails short. If you do this regularly, trimmed nails on the pressing hand remove most of the real risk of a skin tear.
• Do both hands. There is no evidence that one side works better. Doing both takes two minutes and keeps the routine balanced.
• Pair it with the thing that actually works. If your interest is milk supply, the evidence-backed levers are frequent effective feeding or expressing, good attachment and support from a midwife or lactation consultant. Use SI1 as a calm moment alongside that, not instead of it.
• Keep a simple note. If you want to know whether it helps you, write down what you did and how you felt for two weeks. Personal patterns are easier to see on paper than in memory.
• Stop for a few days if the nail fold is sore. Tenderness after pressing means you pressed too hard or too often. Skin around a nail is thin and heals slowly.
• Do not use it on a baby. Infant fingers are tiny and the skin is fragile. This page describes adult self-pressure only.

What do people get wrong with SI1?

• Expecting a cure. The biggest mistake. SI1 has no demonstrated power to restore milk supply, clear an infection or fix vision. Going in expecting a result sets you up to delay something that would have worked.
• Picking the wrong nail corner. Pressing the inner corner of the little fingernail, nearer the ring finger, is a different point on a different channel. SI1 is the outer corner only.
• Pressing the ring finger. Videos shot in a mirror flip left and right, and viewers end up a finger over. Count across from the thumb before you start.
• Digging in with a fingernail. The nail fold is thin skin over bone. A nail edge can break it, and a broken nail fold can become an infected paronychia.
• Treating a hot, painful breast at home. Mastitis with fever, spreading redness, flu-like aching or feeling very unwell needs medical assessment, often antibiotics. Pressing a fingertip while that develops is a real risk, not a theoretical one.
• Using it on an arm after breast surgery. People who have had lymph nodes removed from the armpit, or who have lymphoedema, are often advised to protect that arm's skin. Repeated hard pinching near a nail is exactly the kind of small trauma to check with your team about first.
• Pressing damaged skin. A cut, hangnail, burn, fresh fracture or a finger that has just had surgery is a no. So is a finger that is bruised or unexplainably swollen.
• Doing it far too often. Several long sessions a day on one small patch leaves it sore and achieves nothing extra.
• Quoting a trial as proof. Studies that needled SI1 in a formula of six or eight points cannot tell you what finger pressure on SI1 alone does. Reading them as proof overstates what is known.

What does the research on SI1 actually say?

There is no body of research testing SI1 on its own, and none at all testing self-applied finger pressure on SI1. That is the honest headline.

Where SI1 does appear in the literature is inside acupuncture formulas for lactation problems and for breast inflammation. Trials in this area have mostly been small, carried out in single centres, and unblinded or only partly blinded. They typically needled several points together, so even when a trial reported a benefit, the design cannot tell you whether SI1 contributed anything. Reviewers looking at acupuncture for mastitis and for low milk supply have repeatedly described the available studies as few, small and at risk of bias, with results that do not consistently separate acupuncture from usual care or from a sham procedure.

Two further limits matter for a reader of this page. First, needling and finger pressure are different interventions; a result from one does not transfer to the other. Second, outcomes like perceived milk supply and breast comfort are strongly influenced by attention, reassurance and the natural course of the problem. Without blinding, those influences are hard to separate from any effect of the point itself.

For the other traditional uses of SI1 — fever, sore throat, eye complaints, headache, collapse — no useful controlled human research on this specific point was found. Acupressure research in general shows small, short-lived effects on symptoms like pain and nausea, with the clearest evidence anywhere in the field belonging to a different point, PC6, for nausea and vomiting. SI1 has nothing comparable behind it.

What this means in practice: treat SI1 as a traditional point with high standing in its own system and essentially no human evidence base of its own. That is not a reason never to press it. It is a reason not to let it stand in for care that has actually been shown to work.