Jugu

What is LI16?

LI16, or Jugu, is a Large Intestine channel point in the dip on top of the shoulder, just behind the outer end of the collarbone.

The name Jugu means "great bone", a reference to the collarbone and shoulder blade that frame it. It is the sixteenth point of the Large Intestine channel, and classical texts also treat it as a meeting point with the Yang Motility Vessel (Yang Qiao Mai). Teachers have used it for shoulder and arm complaints for well over a thousand years.

Two honest points before you read further. Traditional standing is not evidence that a point works, and long use is not evidence that it is safe for you. Both have to be judged separately, and this page tries to do that.

On evidence: there is essentially no human research testing LI16 on its own. It appears inside multi-point acupuncture formulas in some shoulder-pain trials, but those trials cannot tell you what this single point contributed. Research on acupressure in general is mostly small, unblinded and short-term, which means results are easy to overstate.

What is fair to say is this. Firm, comfortable pressure on a tight, tender spot near the shoulder often feels good for a while, and the area around LI16 sits over the upper trapezius and supraspinatus muscles that commonly ache after desk work or carrying loads. That is a plausible local effect, not a proven one, and it is not a treatment for a torn rotator cuff, a frozen shoulder or a fracture.

This page covers finger pressure only. Nothing here involves needles, moxibustion or anything that breaks the skin. LI16 sits close to the collarbone, the shoulder joint and, deeper still, the top of the lung, which is exactly why professional texts warn practitioners about depth here. Fingertips do not reach those structures, but it is still a region where you press sensibly and stop when something hurts sharply.

Where is LI16 and how do you find it?

LI16 sits in the soft hollow on top of the shoulder, between the outer tip of your collarbone and the bony ridge of the shoulder blade behind it.

• Start at the collarbone. Put the fingertips of your opposite hand on your collarbone near the breastbone, then walk them outwards along it towards the shoulder.
• Find the outer end. Keep tracing until the bone stops and you feel a small knuckle-like bump. That is the joint where the collarbone meets the shoulder blade.
• Reach back a little. Slide your fingers backwards, towards your shoulder blade, by about a finger's width. You should drop into a soft dip rather than stay on hard bone.
• Check the back wall. Behind that dip you will feel another firm ridge running away towards your spine. That is the spine of the shoulder blade. LI16 lies in the hollow between the two bones.
• Confirm with movement. Lift your arm out to the side. The tissue under your fingers should tighten and shift. If your finger is sitting on top of a bone instead, slide forward or back until it settles into the gap.

In traditional measurement this is described as the depression between the acromial end of the clavicle and the scapular spine, which is roughly one thumb-width (about 2 cm) behind the collarbone's outer tip. Depth is not something you need to think about, because you are only pressing with a fingertip.

Do not confuse LI16 with GB21, the much better-known point on the fleshy ridge of muscle halfway between the base of your neck and the point of the shoulder. GB21 is on muscle in the middle of that slope. LI16 is further out and further forward, tucked into a bony hollow.

How do you apply pressure to LI16?

1. Sit and let the arm hang. Sit upright with your shoulders down and the arm on the side you are treating relaxed in your lap. Tense shoulders make the hollow harder to feel.
2. Cross over with the other hand. Reach across your chest and place your index or middle fingertip in the dip you located behind the outer end of the collarbone.
3. Press downwards and slightly back. Aim into the hollow, not forwards into the soft pocket above the collarbone. Avoid grinding on the bony knuckle of the joint itself.
4. Use moderate pressure. Build up to a firm, satisfying ache around four to six out of ten. It should never be sharp, burning or breathtaking.
5. Hold or circle. Hold steady for 30 to 60 seconds, or make small slow circles for the same time. Keep breathing normally throughout.
6. Repeat and swap sides. Do two or three rounds per shoulder, with a short rest between rounds. Most people find two or three sessions a day is plenty.
7. Finish with movement. Afterwards, roll the shoulder slowly backwards a few times. Gentle movement usually matters more than the pressure itself.

Stop straight away if you feel sharp pain, pins and needles, numbness running down the arm, light-headedness or breathlessness. Stop too if the skin reddens badly or you feel tender for more than a day afterwards. That means you pressed too hard, not that it is working.

Keep total time short. Five minutes per shoulder in a session is more than enough, and pressing for longer has no known added benefit. This is finger pressure only: never use a sharp object, and never break the skin.

What is LI16 traditionally used for?

• Shoulder pain and stiffness. This is the main traditional use, especially pain on top of the shoulder. Human evidence for LI16 specifically does not exist; broader reviews of acupuncture for shoulder pain have found the evidence too weak to draw firm conclusions, and acupressure trials are smaller still.
• Trouble raising the arm. Classical texts list LI16 for an arm that cannot be lifted. No controlled study has tested pressure here for restricted shoulder movement. If your arm will not go overhead, the cause needs diagnosing rather than pressing.
• Neck and upper back tension. It is often used alongside neighbouring points for a tight neck and sore shoulder blade. Massage and pressure to tight upper trapezius muscle does often give short-term relief, but that is a general soft-tissue effect, not something proven for this point.
• Pain around the shoulder blade. Tradition pairs LI16 with scapular pain and arm aching. Evidence here is limited to practitioner reports and point formulas used in trials, which cannot separate out one point's contribution.
• Coughing blood and neck lumps. Older texts list LI16 for coughing blood and for "scrofula", meaning swollen neck glands. Treat these as historical entries only. Both are symptoms that need urgent medical assessment, and there is no evidence that pressure helps either.
• Sensation of heat or toothache. Some classical sources attach broader Large Intestine channel claims to LI16, such as toothache or heat in the body. There is no human research supporting these uses at all.

Taken together, the realistic expectation is modest, temporary easing of a tight, achy shoulder in some people. That is worth trying if it is comfortable. It is not a substitute for assessment of a shoulder that is weak, locked, or getting worse.

Are there tips for using LI16 effectively?

• Warm the area first. A hot shower or a few slow shoulder rolls before you press makes the tissue softer and the hollow easier to find. Cold, guarded muscle resists pressure.
• Let someone else do the work. Reaching across your own body tires the pressing arm fast. If a partner can place a thumb in the hollow while you sit relaxed, your shoulder stays loose and the pressure stays steady.
• Press on the exhale. Breathe out slowly as you increase pressure, then hold at a comfortable level. It keeps you from bracing and tensing the shoulder you are trying to settle.
• Hunt for the tender spot. Within the hollow, one small area is usually more tender than the rest. Work there rather than mashing the whole shoulder top.
• Pair it with movement. Follow each round with slow, pain-free shoulder circles or a wall slide. For shoulder complaints, gradual loaded movement has far better evidence than pressure does.
• Fix the cause too. If your shoulder aches by mid-afternoon, raise your screen, lower your chair arms, or swap a heavy shoulder bag for a backpack. Pressure on LI16 will not out-run eight hours of a bad desk setup.
• Keep a short log. Note your pain out of ten before and an hour after, for a week or two. It stops you crediting an effect that is not there.
• Give it a fair but limited trial. If two weeks of sensible use changes nothing, stop and get the shoulder looked at. Persisting with the same thing rarely produces a different result.
• Stay on soft tissue. If your fingertip is on hard bone, move it. The point is in the gap, and pressing a bony knuckle just bruises the joint capsule.

What do people get wrong with LI16?

• Pressing GB21 instead. Most videos actually show the fleshy muscle ridge halfway between the neck and the shoulder tip. LI16 is further out and forward, in a bony hollow behind the end of the collarbone.
• Landing on bone. Sitting on the hard knuckle where the collarbone meets the shoulder blade hurts and achieves nothing. You want the dip just behind it.
• Digging into the wrong pocket. Some people press into the soft hollow above the collarbone at the base of the neck. That is a different area with nerves and blood vessels close to the surface, and hard pressure there can cause numbness or shooting pain.
• Using far too much force. Grinding until you bruise does not make the effect stronger. Tenderness lasting more than a day means you overdid it.
• Expecting a cure. No point cures a frozen shoulder, a rotator cuff tear or arthritis. Expect possible short-term easing of tightness, and judge honestly whether you get even that.
• Pressing through sharp or electric pain. Shooting pain, tingling or numbness down the arm is a signal to stop. It suggests nerve involvement, which pressure can aggravate.
• Ignoring a lump. A new firm swelling near the collarbone or above it is not a knot to be massaged out. It needs a doctor, not a thumb.
• Pressing over hardware or recent surgery. People forget that pacemakers, chest ports and plated collarbones sit exactly under this region. Pressure there risks real harm.
• Dropping the rest of the plan. Using LI16 instead of prescribed exercises, physiotherapy or medication usually sets recovery back. Treat it as an add-on at most.

What does the research on LI16 actually say?

There is no useful human research on LI16 by itself. No controlled trial that we can point to has tested finger pressure on this single point for any condition, so any confident claim about it is going beyond what is known.

Where LI16 does appear in the literature, it is as one name inside a longer acupuncture prescription for shoulder pain or restricted arm movement. Those studies needled a set of points together. That is simply what the trials did, and it is not something to copy at home. Even when such a study reports a benefit, the design cannot tell you whether LI16 contributed anything, or whether the same result would follow from pressing it with a finger.

The wider picture is not encouraging. A Cochrane systematic review of acupuncture for shoulder pain concluded there was insufficient evidence to support or refute its use, with the available trials small and short. Later reviews have been mixed and have repeatedly flagged weak blinding and high risk of bias. Acupressure research in general shares those problems: small groups, no credible sham, outcomes measured over days rather than months, and participants who know exactly what they received.

That matters because shoulder pain is a condition where expectation and simple attention shift reported pain quite a lot. Someone sitting quietly, breathing slowly and receiving steady pressure for five minutes will often report feeling better, whichever spot was pressed.

So the honest grading is this. Traditionally, LI16 is a standard, named point taught in curricula and listed in the classics. Scientifically, the evidence for it is absent rather than negative. Nobody has shown it does not work; nobody has shown it does.

Practically, that leaves it in the category of a low-risk comfort measure for a tight shoulder, provided none of the cautions on this page apply to you. If your shoulder is weak, locked, swollen or worsening, research on this point gives you no reason to delay a proper assessment.