Chengman

What is ST20?

ST20 (Chengman) sits on the upper belly, a few finger-widths above the navel and about two thumb-widths out from the midline. It is the twentieth point on the Stomach channel, one of a vertical line of Stomach points running down the front of the abdomen.

The name Chengman is usually translated as Supporting Fullness or Assuming Fullness. Classical texts group it with the upper-abdominal points used for the sensation of a full, tight, blocked stomach: epigastric pain, bloating, belching, poor appetite and nausea. It is taught in standard acupuncture curricula, but it is a second-string point rather than a headline one, and most practitioners reach for other abdominal points first.

The honest verdict on evidence: there is essentially no human research on ST20 specifically. Nothing has tested finger pressure on this point against a sham or a control group for any condition. What exists is tradition, practitioner habit and a handful of multi-point abdominal protocols in which ST20 may appear alongside several other points, which tells you nothing about ST20 on its own.

Two things are worth stating once, clearly, before the rest of this page. A point's long history in the tradition is not evidence that it works, and it is not evidence that it is safe to press. Many points have been used for centuries without ever being tested, and the upper abdomen in particular sits over organs and blood vessels that deserve respect. The rest of this page describes self-applied finger pressure only. It is not a treatment for stomach disease, and it is not a reason to delay getting a persistent digestive symptom looked at.

If you came here from a video promising ST20 fixes indigestion, treat that as a claim, not a fact. Gentle pressure on a tight belly may feel pleasant and relaxing. That is a reasonable thing to want, and it is a much smaller claim than the one you were sold.

Where is ST20 and how do you find it?

ST20 lies on the upper abdomen, roughly two-thirds of the way from the navel up to the base of the breastbone, and about two thumb-widths out to the side.

• Lie down and bend your knees. Resting on your back with knees up lets the belly wall soften. A tense abdomen makes every landmark harder to feel.
• Find your two anchors. Put one fingertip in your navel. Put the other where your lower ribs meet in the soft dip below the breastbone. In traditional measurement that gap is 8 cun, whatever your body size.
• Go five-eighths of the way up. ST20 sits 5 cun above the navel, so measure a little over half the distance from navel to breastbone. On most adults that is roughly 10 to 13 cm above the navel.
• Move out to the side. From that spot, slide about two thumb-widths (2 cun, roughly 4 cm) sideways. There is a left ST20 and a right ST20.
• Check against the nipple line. The Stomach channel line on the abdomen sits about halfway between the midline and a line dropped straight down from the nipple. That is a useful sanity check on your sideways distance.
• Feel what is under your finger. You should be on soft muscle and belly wall, not on the hard edge of a rib or on the bony breastbone. If you feel bone, you have gone too high or too far out.

Use your own body to measure. A thumb-width means the width of your thumb at the knuckle, not a fixed number of centimetres from a chart. Tall people and short people have different cun.

If you cannot pin the exact spot, that is normal and not a problem. Work with the conservative version: the general area of soft upper abdomen two thumb-widths out from the midline, well below the rib edge. Gentle pressure there is the safest reading of the landmark.

How do you apply pressure to ST20?

1. Pick your moment. Wait at least an hour after a meal. Pressing a full stomach is uncomfortable and can make reflux worse.
2. Get comfortable. Lie on your back with knees bent, or sit and lean back slightly. The belly wall must be relaxed, not braced.
3. Warm your hands. Rub your palms together first. Cold fingertips on a bare abdomen make people tense up and guard.
4. Use flat finger pads. Place the pads of your index and middle fingers on the point. Never use a fingernail, a knuckle, a pen cap or a massage tool on the abdomen.
5. Sink in slowly. Press straight down over two or three seconds. Aim for a mild, dull fullness, around three out of ten on a discomfort scale. Sharp, stabbing or burning pain means stop immediately.
6. Hold and breathe. Keep steady pressure for 20 to 30 seconds while breathing out slowly. Let the finger sink a little further as the belly softens.
7. Or make small circles. Instead of static holding, move the skin in slow circles about the size of a coin for 30 to 60 seconds. Do not slide or drag across dry skin.
8. Do both sides. Treat left and right separately, or use one hand on each at the same time if that is easier.
9. Repeat sparingly. Two or three rounds per session, once or twice a day, is plenty. More is not better on the abdomen.

Stop at once if you feel sharp pain, a pulsing lump under your fingers, nausea that worsens, dizziness, or pain that spreads to your back or shoulder. Stop and do not resume if the area is bruised or tender the next day.

This is finger pressure and nothing else. Do not break the skin, do not burn anything over the point, and do not let an untrained person push hard into your abdomen.

What is ST20 traditionally used for?

• Epigastric pain and fullness. The classic use: that tight, blocked, over-full feeling just below the ribs. No controlled human trial has tested ST20 pressure for it. Any relief people report may come from warmth, slow breathing and relaxation rather than the point itself.
• Bloating and belching. Tradition pairs ST20 with abdominal distension and frequent burping. Evidence specific to this point is absent. Gentle abdominal massage in general has some weak support for comfort, but that is not the same as a point-specific effect.
• Nausea and vomiting. Listed in classical sources. Here it matters to be clear: the acupressure point with genuinely good human evidence for nausea is PC6 on the inner wrist, tested in many controlled trials for pregnancy sickness, motion sickness and post-operative nausea. ST20 has nothing comparable. If nausea is your problem, PC6 is the better-supported choice.
• Poor appetite. Traditionally used where appetite is low and food sits heavily. Untested in humans. Loss of appetite that lasts more than a couple of weeks needs a doctor, not a pressure point.
• Rumbling and loose stools. Appears in older indication lists alongside other upper-abdominal Stomach points. There is no modern human evidence for ST20 here at all.
• Cough and chest oppression. Some classical texts attach breathing complaints, and even coughing blood, to this point. Treat that as historical record only. Coughing blood is an emergency symptom and must be assessed by a doctor the same day.

Across all of these, the pattern is the same: a long traditional record and an empty modern evidence file. That does not prove ST20 does nothing. It means nobody has checked properly, and you should keep your expectations small.

A fair way to use ST20 is as a few minutes of calm, warm self-massage over a tense belly, with no promise attached. If a symptom is new, severe or getting worse, the point is not the answer.

Are there tips for using ST20 effectively?

• Breathe out as you press. The abdominal wall relaxes on the out-breath. Sinking in during a slow exhale is far more comfortable than pressing against a held breath.
• Measure on your own body. Use your navel and the base of your breastbone as the two ends of the ruler, then take five-eighths of that distance. Fixed centimetre figures from a video will be wrong for most people.
• Keep the pressure honest. Mild dull fullness is the target. On the abdomen, harder is not stronger medicine, it is just a bruise waiting to happen.
• Add warmth, not heat. A warm palm or a covered warm pack over the area before pressing helps the belly soften. Never use anything that burns or marks the skin.
• Time-box a trial. Give it two weeks of regular short sessions and write down what happens. If nothing changes, stop and try something with better support.
• Pair it with the basics. Smaller meals, eating slowly, less alcohol and a gentle walk after eating have real evidence behind them for indigestion. ST20 is at best an add-on to those.
• Use PC6 for nausea instead. If sickness is your main complaint, the inner-wrist point PC6 has actual controlled human trials behind it. Choose the better-evidenced point first.
• Do not stop prescribed medicine. If you take acid-reducing or motility medicine, keep taking it. Talk to your prescriber before changing anything.
• Keep a symptom diary instead of a belief. Note the date, what you did and how you felt an hour later. Honest notes beat memory, which tends to remember the good days.

One practical point about expectations. Short self-massage routines often feel good partly because you stopped, lay down and breathed for three minutes. That is a genuine benefit. It is just not proof that a specific spot two thumb-widths from your midline did the work.

What do people get wrong with ST20?

• Expecting a cure. The biggest error. ST20 will not cure gastritis, reflux, an ulcer or an infection, and no honest source will promise that it does.
• Pressing far too hard. The abdomen has no bony floor to protect it. Digging in with knuckles or a tool can bruise tissue and strain the belly wall.
• Confusing it with its neighbours. CV12 sits on the midline, not out to the side. ST21 (Liangmen) sits about one thumb-width lower on the same line. ST20 is the one 5 cun above the navel and 2 cun out.
• Working on a full stomach. Pressing soon after eating can trigger reflux or nausea. Leave an hour or more.
• Going too high onto the ribs. If your finger meets a hard rib edge or the breastbone, you have overshot. Pressure on the rib margin is uncomfortable and pointless.
• Ignoring warning signs. Unplanned weight loss, trouble swallowing, vomiting blood, black tarry stools, or pain that wakes you at night are red flags. These need a doctor, not more massage.
• Letting someone else press hard. A partner cannot feel what you feel. If anyone works on your abdomen, they must stay light and stop the moment you say so.
• Using it on small children or frail older people. Thin, soft abdominal walls and fragile tissue make firm pressure a poor idea. Ask a clinician first.
• Treating a classical indication literally. Old texts list this point for coughing blood. That is history, not instruction. Blood in a cough is an emergency.

A final one: assuming that because a point is old and widely taught, it must be safe. Tradition says nothing about whether your particular abdomen, on this particular day, should be pressed at all.

What does the research on ST20 actually say?

No useful human research on ST20 specifically was found. There appear to be no controlled trials, and no reliable uncontrolled studies either, testing finger pressure on Chengman for indigestion, bloating, nausea, appetite or anything else.

What does exist in the wider literature is research on abdominal acupuncture and acupressure using multi-point protocols. Trials on functional dyspepsia (ongoing indigestion with no structural cause) and on post-operative gut recovery typically needle or press combinations such as ST36 below the knee, PC6 at the wrist and CV12 on the midline. Results are mixed, trials are usually small, and blinding is difficult. Even where a protocol shows benefit, you cannot attribute it to any single point in the set, and ST20 is rarely part of those sets.

The one genuinely strong signal anywhere in acupressure research is PC6 for nausea and vomiting. Many randomised controlled trials, including wristband studies in pregnancy sickness, motion sickness and post-operative nausea, show a real if modest effect. That body of work is specific to PC6. It does not transfer to ST20, and nobody should present it as if it did.

So what does the gap mean? Not that ST20 has been tested and failed. It means it has not been tested. Absence of evidence leaves you with tradition, practitioner experience and your own observation, which are weak grounds for any confident claim. It also means nobody has formally studied the harms of pressing this spot, so caution about the abdomen is based on anatomy and common sense rather than trial data.

Practically, judge ST20 on how it feels, not on what it is supposed to do. Short, gentle, warm self-massage of the upper belly is low risk for most healthy adults and may be relaxing. If your digestive symptoms are persistent, worsening, or come with weight loss, bleeding or trouble swallowing, the research question becomes irrelevant. That needs a proper medical assessment.