Quyuan

What is SI13?

SI13, Quyuan, is a point on the Small Intestine channel, in the hollow just above the inner end of the shoulder blade's bony ridge.

The name Quyuan is usually translated "crooked wall", a nod to the curved ridge of bone the point sits against. It is the thirteenth of the nineteen points on the Small Intestine channel, which runs from the little finger, up the arm, across the shoulder blade and on to the face.

In traditional practice SI13 is treated as a local point. Practitioners reach for it for aching, stiffness or knotted muscle in the shoulder blade, the top of the shoulder and the upper back. Some classical sources also link it to cough and a tight chest, which is a much weaker and more indirect claim.

The honest verdict on evidence: no controlled human trial has tested SI13 on its own, by needle or by finger. What exists is broader research on acupuncture and acupressure for shoulder and neck pain, usually using several points at once, often small and unblinded, and rarely followed up for long. That cannot tell you what this one point does.

What is solid is the anatomy. SI13 lies over the supraspinatus muscle, a muscle that tightens in people who sit at desks, carry bags on one shoulder or lift overhead. Firm pressure on a tight muscle often feels better for a while. That is a reasonable thing to expect and a modest thing to claim.

Two points worth making once, here, rather than at the top of every section. First, a point appearing in every textbook for two thousand years tells you it was used widely, not that it works. Second, that long history is not a safety record either. The cautions further down come from anatomy and modern practice, not from the classics.

Where is SI13 and how do you find it?

SI13 sits in the soft dip just above the inner end of the shoulder blade's bony ridge, part way between your backbone and the top of your shoulder.

• Find the ridge first. Reach over your shoulder, or have someone else feel for you. Across the upper back there is a hard horizontal bar of bone, the spine of the scapula. It runs from the point of your shoulder inwards and slightly downwards.
• Follow it inwards. Trace that ridge towards your backbone until it tapers out and disappears. That inner end is the key landmark, usually about 5 to 7 cm (two to three thumb-widths) out from the bumps of your spine.
• Step up into the hollow. Just above that inner end, between the ridge below and the top edge of the shoulder blade above, is a shallow soft pocket of muscle. SI13 is in that pocket.
• Cross-check the height. Sources agree SI13 is at the inner end of this hollow, roughly level with the gap below the second vertebra of the upper back. Some texts place it about midway between SI10 and that vertebra. Both descriptions land you in the same soft pocket.
• Confirm with movement. Keep a finger in the dip and slowly lift your arm out to the side. The muscle under your fingertip should bunch and firm up. That is supraspinatus, and it confirms you are in muscle, not on bone.

Two drifts to avoid. If your finger is on a hard bar, you have slipped onto the ridge itself. If you slide downwards below the ridge, you have left SI13 and are over a different muscle and a different point.

If you cannot be sure, stay conservative. Work the soft hollow above the inner end of the ridge and keep your pressure well out from the midline of your back rather than hunting for a pinpoint.

How do you apply pressure to SI13?

1. Get access. SI13 is awkward to reach on yourself. Reach across your chest and over the opposite shoulder with your fingertips, or ask a partner, or lean the spot against a tennis ball held on a wall.
2. Warm the area. A hot shower or a few slow shoulder rolls first makes the muscle easier to work with and less likely to protest.
3. Settle into the hollow. Place two fingertips, or the ball, in the soft dip above the inner end of the bony ridge. Sink in slowly rather than jabbing.
4. Choose your pressure. Aim for a firm, satisfying ache around three to five out of ten. If you are wincing, holding your breath or tensing your neck, you are pressing too hard.
5. Hold and breathe. Keep steady pressure for 30 to 60 seconds, breathing normally. Small slow circles are fine. Then ease off over a couple of seconds.
6. Repeat sparingly. Two or three holds per side, then stop. Once or twice a day is plenty, and it is reasonable to use it for a few days around a flare-up of shoulder tension.
7. Add gentle movement. After releasing, lift and lower the arm a few times. Any easing you get tends to feel more useful when the shoulder then moves.
8. Check in afterwards. Mild tenderness for an hour or so is normal. Soreness that is worse the next day means you went too hard.

This is self-applied finger pressure only. Nothing on this page involves needles, skin-breaking, burning herbs or cups, and none of those should be attempted at home.

Stop immediately, and do not restart, if you feel sharp pain, pins and needles, numbness or anything shooting down the arm. Stop too if the area is hot, red, swollen or newly bruised without a reason you can explain.

What is SI13 traditionally used for?

• Shoulder blade pain and stiffness. This is the main traditional use and the most plausible one, because SI13 sits directly over the supraspinatus muscle. Human research on firm pressure or massage for shoulder and upper-back muscle pain is mostly small, unblinded and short-term, and often shows modest short-lived relief. No trial has tested SI13 alone.
• Upper back and neck tension. Tradition groups SI13 with neighbouring Small Intestine points for a tight, bunched upper back. Trials of acupuncture and acupressure for neck and shoulder pain usually combine several points, so they cannot tell you what this point contributes.
• Shoulder that is sore to lift. Practitioners use SI13 when raising the arm hurts. Pressure may ease muscle guarding for a while, but it does not treat a torn tendon, a frozen shoulder or a trapped nerve, and those need assessment.
• Cough and chest tightness. Some classical sources list these for SI13. There is no credible human evidence for that use, and breathing problems should be looked at properly rather than pressed on.
• Stress held in the shoulders. A common modern use. Any benefit here is hard to separate from the general effect of pausing, breathing slowly and having a shoulder touched, which is a real but non-specific effect.

Taken together, the fair summary is this: SI13 is a reasonable spot to put pressure on a tight upper back, with no point-specific human evidence behind it. For contrast, PC6 and nausea is the one acupressure claim with genuinely decent controlled trials behind it. SI13 is nowhere near that standard, and it would be dishonest to imply otherwise.

Are there tips for using SI13 effectively?

• Use a ball against a wall. Reaching over your own shoulder is tiring and your hand gives out before the muscle releases. A tennis or lacrosse ball pinned between the hollow and a wall lets you control pressure by leaning in or stepping back.
• Ask a partner when you can. Another person can keep pressure steady and feel the tissue change. Agree a word that means ease off, and use it.
• Work after heat, not after exercise. A warm shower makes the area more comfortable to press. Straight after heavy lifting or overhead work the muscle is already irritated.
• Keep the shoulder relaxed. Let the arm hang or rest it in your lap. Pressing into a shrugged, braced shoulder achieves very little.
• Pair it with movement. Follow each hold with slow arm raises or shoulder rolls. Pressure plus movement tends to feel more lasting than pressure alone.
• Do both sides if both ache. Upper-back tension is rarely one-sided for long. Treating only the sore side can leave you feeling lopsided.
• Short and regular beats long and brutal. A minute a day for a week is kinder than ten hard minutes once. Deep grinding pressure often leaves the area more sore, not less.
• Look at the cause too. Screen height, bag strap, pillow and mouse position do more for a chronically tight upper back than any point will. Treat SI13 as relief, not as the fix.
• Write down what happens. Note pain before and after and how long any easing lasts. If a week of honest trying changes nothing, that is useful information and a reason to try something else.

What do people get wrong with SI13?

• Expecting a cure. The commonest mistake of all. Finger pressure on SI13 may ease muscle tightness for a while. It will not repair a torn rotator cuff, reverse arthritis or clear a chest infection, and no acupressure point does.
• Pressing on the bony ridge. People land on the hard bar of the scapular spine instead of the soft hollow just above its inner end. Bone does not release, and grinding on it is simply uncomfortable.
• Drifting towards the spine. Sliding inwards off the shoulder blade takes you onto the bones of the back and away from SI13 altogether. Stay out over the shoulder blade, in the muscle.
• Dropping below the ridge. Slipping down under the bony bar puts you over a different muscle and a different point. Above the ridge, not below it.
• Going too hard for too long. Five minutes of elbow-deep pressure usually buys next-day soreness rather than relief. Thirty to sixty seconds at a tolerable ache is the useful dose.
• Pressing through nerve symptoms. Tingling, numbness or pain shooting down the arm is a reason to stop, not a sign it is working.
• Using it to delay assessment. A shoulder that cannot lift, has been weak for weeks, or woke you every night for a fortnight needs a clinician, not another week of self-pressure.
• Treating a bruise or a lump. If the area is swollen, hot, newly bruised with no explanation, or has a lump you have not had checked, leave it alone and get it looked at.
• Confusing tradition with proof. SI13 appearing in old texts and modern curricula says it was widely taught. It says nothing about whether pressing it helps you.

What does the research on SI13 actually say?

There is essentially nothing on SI13 specifically. No controlled human trial has isolated this point, by needling or by finger pressure, and none has compared it against a dummy point or no treatment for any condition.

What does exist sits one or two steps away from the question. There are randomised trials of acupuncture for shoulder pain, neck pain and frozen shoulder, and these commonly use a formula of several points across the shoulder blade and upper back. Results in that literature are mixed. Some trials report short-term pain reduction; many are small, many cannot blind the person receiving treatment, and follow-up is often only a few weeks. Because the points are used together, nothing in them can be attributed to SI13.

The acupressure literature as a whole has the same shape: small studies, unblinded participants, short follow-up, and outcomes that rely on people reporting their own pain. That design makes expectation very hard to separate from effect. It is also why one strong example stands out. Acupressure at PC6 for nausea, including motion sickness, pregnancy sickness and nausea after surgery, has been tested in a good number of controlled trials and does show a real if modest benefit. SI13 has no comparable body of work behind it.

There is separate research on manual pressure and massage for muscular shoulder and upper-back pain, including work on tender spots in the supraspinatus muscle, which lies directly under SI13. That research generally supports short-lived easing of pain and tenderness from firm manual pressure. It is about muscles and pressure in general, not about a named acupuncture point.

The practical meaning for a reader: use SI13 as a sensible place to press a tight upper back if it feels good, and judge it by whether it helps you over a week or two. Do not let anyone sell it to you as a proven treatment, and do not use it in place of assessment for a shoulder that is not recovering.