Yingchuang

What is ST16?

ST16 (Yingchuang) is a Stomach-channel point on the front of the chest, in the third rib space, roughly in line with the nipple.

Its name is usually translated as "Breast Window". It is the sixteenth point of the Stomach channel, which runs down the front of the body from the face, across the chest in a line about four thumb-widths out from the breastbone, and on to the abdomen and leg.

Classical texts group ST16 with the other chest points of the channel and link it to the lungs and breast area. The traditional indications are chest fullness, cough and wheeze, breast swelling and soreness, and pain between the ribs.

Two things are worth saying once, clearly, before the rest of the page. First, the fact that a point has been taught for centuries is not evidence that pressing it does anything measurable. Second, long tradition is not evidence that it is safe for you in particular — the chest wall carries real-world cautions that classical texts never discussed.

The honest verdict on the evidence is short. We found no controlled human trials testing finger pressure on ST16 for any condition. Acupressure research as a whole is dominated by small, unblinded, short-term studies, and ST16 is not one of the points that has attracted even that much attention. So the claims below are reported as tradition, not as proof.

Everything described here is self-applied finger pressure on intact skin. Nothing on this page involves needles, heat, skin-breaking or any procedure a practitioner would perform.

ST16 sits over the upper chest, and in people with breasts it sits at or near the upper edge of breast tissue. That makes the "who should avoid it" section unusually important for this point. Read it before you try anything, especially if you have had chest surgery, an implanted device, a rib injury, or any breast change you have not had examined.

Where is ST16 and how do you find it?

ST16 sits on the front of the chest, in the third rib space, about four thumb-widths out from the midline of the breastbone.

• Start at the breastbone. Put a fingertip in the centre of your chest on the hard flat bone (the sternum). This is the midline the measurement is taken from.
• Find the collarbone and count down. Slide your fingers up to the collarbone, then step down over the ribs. The first soft gap below the collarbone is the first rib space, the next is the second, the next is the third.
• Measure out from the midline. The classical distance is 4 cun from the centre line. On your own body that is roughly the width of your four fingers held together, usually about 8-10 cm for an adult.
• Use the nipple as a cross-check. The nipple line is also about 4 cun from the midline, so ST16 sits in the same vertical line as the nipple but one rib space higher, in the soft gap rather than on bone.
• Confirm by feel. You should feel a slight dip between two ribs. Press gently and the spot often feels a little tender or dull compared with the bone either side.

Anatomy varies, so treat this as an area the size of a coin rather than a pinpoint. In people with larger breasts, the third rib space may sit at the upper slope of the breast; in that case the agreed landmark is still the rib space, and pressure should stay on the bony chest wall above breast tissue.

If you cannot clearly feel a gap between ribs, do not dig for it. Stay light and stay on the surface. There is no needle depth, angle or insertion involved here at any point — this page covers fingertip pressure on the skin only.

How do you apply pressure to ST16?

1. Sit upright and relax your shoulders. A chair with a back support works best. Dropping the shoulder on the side you are working on makes the rib space easier to feel.
2. Place a flat fingerpad, not a nail. Use the pad of your index or middle finger. Keep nails short and the finger flat so the pressure spreads over the rib space instead of poking one spot.
3. Settle into the gap, not the bone. Rest the fingerpad in the soft space between the third and fourth ribs. If you feel hard bone under the pad, move a few millimetres up or down.
4. Press lightly and build slowly. Aim for steady pressure that feels like a firm, dull ache at most. The chest wall is thin, so this point needs noticeably less force than a point on the leg or hand.
5. Hold or circle for 30 to 60 seconds. You can hold steady or make small slow circles. Breathe out as you press and keep breathing normally throughout.
6. Repeat on the other side. ST16 is a paired point, one on each side of the chest. Most people work one side at a time.
7. Keep sessions short. Two or three rounds per side, once or twice a day, is plenty. More pressure and more time do not make a point work better.

Stop straight away if pressing causes sharp pain, a spreading ache, pins and needles down the arm, breathlessness, dizziness, or a cough you cannot settle. Stop also if the skin reddens and stays red, or if the area is sore the next day.

Never press hard enough to bruise, and never press through clothing seams, zips or an underwire, which concentrate force onto one line of the rib.

What is ST16 traditionally used for?

• Cough and wheeze. Classical sources list ST16 for cough, wheezing and a sense of a tight chest, because the point lies over the upper lung area. No controlled human trial has tested finger pressure on ST16 for any breathing problem, so this stays a traditional claim only.
• Chest fullness and tightness. Texts describe it for a stuffed, congested feeling in the chest. Some people find slow pressure plus slow breathing feels calming, but that effect is hard to separate from the breathing and the rest itself.
• Breast soreness and swelling. The name "Breast Window" reflects the traditional use for breast distension, tenderness and blocked milk flow. Human evidence for ST16 specifically is absent; breast pain that is new, one-sided, hot or lumpy needs a doctor, not pressure.
• Pain between the ribs. Tradition uses the chest points for intercostal pain, meaning aching along a rib space. Gentle local pressure may feel soothing for simple muscular soreness, which is a general effect of touch rather than something proven about this point.
• Difficulty swallowing and poor appetite. Because ST16 belongs to the Stomach channel, older texts link it to digestion and to food not going down easily. There is no human research supporting that use, and persistent swallowing trouble always needs assessment.

Across all of these, the fair summary is the same. ST16 is a recognised channel point with a consistent set of classical indications, and essentially no modern human evidence of its own.

That is different from saying it does nothing. It means nobody has tested it properly, so the sensible expectation is mild, short-term comfort at best. If a video promises that ST16 clears a cough or dissolves a lump, that promise is not coming from evidence.

Are there tips for using ST16 effectively?

• Find the rib space with a slow slide. Run a fingerpad gently down from the collarbone instead of poking at the chest. The soft gaps are much easier to feel with a slow slide than with a prod.
• Work on bare or thin-covered skin. A t-shirt is fine. Thick seams, bra straps and underwires push force into one hard line and make the pressure uneven and sore.
• Match the breath to the press. Press on a slow out-breath and ease off on the in-breath. This stops you bracing the chest, which is uncomfortable and makes the point harder to locate.
• Use less force than you expect. There is little padding between skin and rib here. If you are using the force you would use on a shoulder knot, you are using far too much.
• Treat it as an area, not a dot. Explore a coin-sized patch in the third rib space and settle on the spot that feels mildly tender. Chasing a perfect pinpoint wastes time and tempts people to press harder.
• Keep a simple record. Note what you were hoping to ease, what you did, and how you felt an hour later. Honest notes will tell you quickly whether it is worth continuing.
• Pair it with the basics, not instead of them. Rest, fluids, inhaled medication for asthma, and prescribed treatment all do more than a chest point. Use ST16 as an add-on comfort measure.
• Stop at two weeks of no change. If a symptom has not shifted after a couple of weeks of regular use, the point is not helping and the symptom still needs explaining.

One last practical note: do this when you are calm and can sit still. Pressing a chest point while rushed, anxious or short of breath makes normal chest sensations feel alarming.

What do people get wrong with ST16?

• Expecting a cure. ST16 will not cure a cough, asthma, mastitis or a digestive condition. Treat it as a possible comfort measure with weak evidence, nothing more.
• Pressing on the rib instead of the gap. Landing on the hard bone gives a bruising ache and misses the point entirely. The target is the soft space between the third and fourth ribs.
• Confusing ST16 with its neighbours. ST17 sits at the centre of the nipple and is a landmark point only, never pressed. ST15 is one rib space higher and ST18 sits below the breast. Count your rib spaces rather than guessing.
• Measuring from the wrong line. The 4 cun distance is measured out from the midline of the breastbone, not from the edge of the chest or the armpit. Starting in the wrong place puts you several centimetres off.
• Using far too much force. People transfer leg-strength pressure to a thin chest wall and end up with a bruise or a sore rib for days. Firm but tolerable is the ceiling here.
• Pressing on something that needs examining. A new breast lump, a hot red patch, a swollen tender area or skin changes should be seen by a doctor. Massaging them delays diagnosis and can worsen an infection.
• Ignoring chest pain because you have a point for it. Chest pressure, pain spreading to the jaw or arm, or sudden breathlessness is an emergency. No acupressure point is an answer to those symptoms.
• Doing it too often. Several long sessions a day does not increase any benefit and does raise the chance of local soreness and skin irritation.

Most of these mistakes come from one habit: pressing harder when nothing seems to happen. On the chest wall, harder is the wrong direction every time.

What does the research on ST16 actually say?

We found no published human trials testing ST16 on its own, by finger pressure or by any other method, for cough, breast pain, chest tightness or digestion. There is no body of research on this point to summarise, and we will not invent one.

That absence is normal rather than suspicious. Acupuncture and acupressure research concentrates on a small handful of points with commercial or clinical interest, such as PC6 for nausea and vomiting, which does have repeated controlled human trials behind it. Most of the 360-odd classical points, ST16 included, have never been studied alone in people.

Where chest points appear in studies at all, they are usually one item in a multi-point treatment chosen by a practitioner, often with needles rather than pressure. A trial like that cannot tell you what ST16 contributed, because nothing in the design separates one point from the others. Reporting that a trial needled a chest point is a description of what researchers did, not an instruction for readers.

It is also worth knowing the general quality problem in this field. Acupressure trials tend to be small, short, and unblinded, meaning participants know they are being treated. Subjective outcomes such as pain, nausea or tension are exactly the measures most inflated by expectation, so weak study designs tend to overstate benefit.

What this means in practice is simple. Any claim you see about ST16 is drawn from classical texts and clinical tradition, not from trial data. That does not make it worthless, but it does mean the honest confidence level is low.

If better research appears, this page will be updated. Until then, judge ST16 by how it feels to you over a short trial period, keep your expectations modest, and keep any persistent or worsening symptom in front of a doctor.