Zhejin

What is GB23?

GB23, or Zhejin, is a Gall Bladder channel point on the side of the chest, in the fourth rib space just in front of the armpit line.

The name Zhejin is usually translated as "flank sinews". That matches how classical texts use it: for tightness, aching and spasm along the side ribs, for a feeling of fullness in the chest, and for wheezing or sour, bitter reflux.

GB23 sits one thumb-width in front of its neighbour GB22 (Yuanye), and the two are often taught as a pair. Some older sources also describe Zhejin as a gathering point for the Gall Bladder, although in modern standard teaching that role belongs to GB24 (Riyue). GB23 is a real, universally listed point, but it is a minor one. Few practitioners reach for it first, and it rarely appears in point lists aimed at beginners.

The honest verdict on the evidence is short. No controlled human trial has tested GB23 on its own for any condition, and none has tested finger pressure on it. What exists for acupressure in general is mostly small, short and unblinded, which means hopeful expectation can easily account for the results. Anything you feel at GB23 — looser rib muscles, easier breathing, a calmer moment — may be real for you, but it has not been shown to come from the point itself.

One thing to carry into the rest of this page: a point having two thousand years of traditional standing is not evidence that it works, and it is not evidence that it is safe. Those are two separate questions, and both have to be checked on their own. GB23 sits over the ribs, close to the lung and, in many people, close to breast tissue, so the safety question matters more here than it does at a point on the hand.

Everything described below is self-applied finger pressure on unbroken skin.

Where is GB23 and how do you find it?

GB23 sits on the side of your chest, one thumb-width forward of the mid-armpit line, in the soft gap between the fourth and fifth ribs.

• Drop a line from your armpit. Raise your arm a little and imagine a vertical line running straight down from the middle of your armpit hollow. This is the mid-axillary line, and GB22 sits on it.
• Find the fourth rib space. With your fingertips, feel the hard bars of your ribs on that line and the soft dips between them. The fourth space is usually level with the nipple in men, and is roughly a hand's width below the armpit hollow in most adults.
• Move forward one thumb-width. From that spot on the armpit line, slide about 2 cm (one thumb-width, or 1 cun) towards the front of your chest, staying in the same rib gap. That is GB23.
• Check with a breath. Rest your finger there and breathe in slowly. You should feel the rib below and above move apart slightly under your fingertip. That tells you that you are in the space, not on bone.
• Expect mild tenderness. The muscle between the ribs is often slightly sore to firm touch on one side. A dull, local ache is normal. A sharp or electric feeling is not, and means you should stop.

If you have breast tissue over this area, do not try to use nipple level as your guide, because it shifts. Count rib spaces down from the armpit instead, and work on the chest wall at the edge of the breast rather than pressing through breast tissue.

Point maps vary slightly between schools, usually by a rib space. If your map disagrees, what is agreed is this: GB23 is on the side of the chest, over a rib gap, a thumb-width in front of the armpit line and level with GB22. Stay in that area and work gently.

How do you apply pressure to GB23?

1. Sit or lie comfortably. Sitting upright or lying on your back both work. Let your shoulder drop and your arm hang loose so the rib muscles are not braced.
2. Use a flat finger pad. Place the pad of your index or middle finger on the point. Never use a fingernail, a knuckle, a pen cap or a massage tool here; the ribs and the tissue between them do not tolerate sharp pressure.
3. Press into the gap, not the bone. Aim straight in towards the chest wall, settling into the soft space between the ribs. If your finger is sitting on a hard bar, slide a few millimetres up or down.
4. Keep it light to moderate. Around 3 or 4 out of 10 is plenty on the chest. You want a dull sense of pressure, never a pinch, a sting or anything that makes you hold your breath.
5. Hold for 30 to 60 seconds. Breathe slowly and normally while you hold. Some people prefer small, slow circles instead of a steady hold; both are fine at this pressure.
6. Do the other side. GB23 is a paired point, so treat left and right for the same length of time.
7. Repeat once or twice a day. Two or three short sessions a day is as much as anyone needs. More pressing does not mean more effect, and the skin over ribs bruises easily.

Stop straight away if pressing causes sharp pain, pain that shoots along a rib, breathlessness, dizziness or a cough. Stop also if the skin reddens and stays sore for more than a day, and leave the area alone until it is comfortable again.

Give it about two weeks of honest trial. If nothing has changed in that time, GB23 is unlikely to be the answer for your problem, and pressing harder is not the fix.

What is GB23 traditionally used for?

• Rib-side and flank tightness. This is the main classical use, and the one its name points at. Tradition describes GB23 for aching, cramping or stiffness along the side ribs. No trial has tested GB23 for this, though gentle self-massage over a tight chest wall muscle is a reasonable, low-risk thing to try.
• Chest fullness and tight breathing. Older texts list GB23 for a stuffy, oppressed feeling in the chest and for wheezing. There is no human evidence that pressing it changes breathing, and it is not a treatment for asthma. Keep using your inhaler or other prescribed medicine exactly as directed.
• Intercostal pain. Practitioners sometimes use GB23 for pain running along a rib, often called intercostal neuralgia (nerve pain between the ribs). The evidence here is clinical habit, not trial data, and new rib pain always needs a cause found first.
• Reflux, nausea and a bitter taste. Gall Bladder channel points are traditionally linked to bitter reflux and vomiting. No study supports GB23 for this. If you want an acupressure point with genuine human evidence for nausea, that is PC6 on the inner forearm, not GB23.
• Anxiety and chest tension. Some modern practitioners use GB23 for the tight-chested feeling that goes with stress. Slow breathing with steady finger contact is calming for many people, but there is no evidence that the effect comes from this point rather than from the pause and the breathing.
• Swollen glands under the arm. A few classical lists mention GB23 and GB22 for axillary swelling. Do not self-treat a lump or swelling under your arm. That needs a doctor to look at it, and pressure on it can do harm.

Across all of these, the pattern is the same: long traditional use, no controlled human testing of GB23 itself. Treat it as something to try alongside proper care, not instead of it.

Are there tips for using GB23 effectively?

• Breathe out as you press in. Let the pressure deepen slightly on the out-breath and ease on the in-breath. The rib muscles relax on exhalation, so the point is easier to reach and less tender.
• Warm the area first. A warm shower or a few minutes with a warm (not hot) pack on the side of the chest makes tight rib muscles far more comfortable to work on.
• Find the rib space before you add pressure. Spend ten seconds mapping the gap with a light fingertip. Most of the discomfort people report at GB23 comes from pressing bone, not from the point.
• Work both sides, even if one hurts. Treating the pain-free side as well takes the same minute and keeps you from overworking a single sore spot.
• Pair it with movement. A slow side-bend or a gentle overhead reach after pressing gives tight rib muscles something to do. Movement is the part with the better general evidence behind it.
• Keep a simple two-week log. Write a daily 0 to 10 score for whatever you are targeting. Memory flatters a new routine; a written number does not.
• Keep sessions short. One minute per side, once or twice a day, is the whole routine. Long sessions over ribs lead to bruising and tenderness, not to better results.
• Check the obvious causes too. Side-rib tightness often tracks back to a cough, a desk setup, a heavy bag on one shoulder or a new gym exercise. Fixing that usually does more than any point.
• Keep nails short. The skin over the lateral ribs is thin and marks easily, so use the flat pad of the finger and keep nails trimmed.

If a session leaves you sore the next day, you used too much pressure. Halve it, and shorten the hold.

What do people get wrong with GB23?

• Expecting a cure. GB23 will not cure asthma, reflux, gallstones or nerve pain. No acupressure point cures anything, and treating it as a replacement for diagnosis or medication is the most harmful mistake on this list.
• Pressing on the rib. Landing on the hard bar of bone instead of the soft gap between ribs. It hurts, it bruises, and it misses the point entirely.
• Using far too much force. The chest wall is not the shoulder. Digging in with a thumb or a hard tool over the ribs risks bruising and, with fragile bones, worse.
• Mixing GB23 up with its neighbours. GB22 sits on the armpit line itself, GB24 sits lower and more to the front below the nipple, and GB21 is up on the top of the shoulder. GB23 is the one a thumb-width in front of the armpit line, in the fourth rib space.
• Pressing through breast tissue. Working deep through the breast is uncomfortable and unnecessary. Stay on the chest wall at the side, and skip the point if you cannot reach it without pressing into breast tissue.
• Ignoring new chest pain. Treating chest tightness or chest pain with a point instead of getting it checked wastes time that can matter a great deal. Heart and lung problems can feel like muscle pain.
• Trying to needle it from a video. Some videos show practitioners needling chest points. This page is finger pressure only, and the chest wall is one of the places where that distinction matters most.
• Giving up after one go, or never stopping. One session proves nothing, and six weeks of pressing an unchanged problem proves something else. Two weeks is a fair trial either way.

What does the research on GB23 actually say?

There is essentially nothing. We found no controlled human trial, and no decent observational study, that tested GB23 (Zhejin) on its own for any condition. That is true for needling and for finger pressure alike.

Where GB23 appears in published work at all, it is normally one name in a longer prescription of points used in a traditional-medicine study. Those designs cannot tell you what any single point contributed. If a multi-point treatment helped, the result belongs to the whole package, the practitioner's attention and the patient's expectation, not to GB23.

It also helps to know what the wider acupressure literature looks like, because it sets the ceiling for what a page like this can claim. Most acupressure trials are small, run for a short time, and cannot blind the person receiving the pressure. People know they are being touched, and that alone shifts self-reported scores for pain, nausea and anxiety. So modest positive findings in this field are easy to produce and hard to trust.

The clearest exception is PC6 on the inner forearm for nausea and vomiting, where repeated controlled trials and systematic reviews in real patients support a genuine, if modest, effect. That is worth naming because it shows the bar. GB23 is nowhere near it, and nothing about PC6's results transfers to a different point on a different channel.

What this means in practice is simple. If you try GB23, treat it as a low-cost comfort measure for a tight, achy chest wall, applied gently to unbroken skin. Judge it only by whether your own symptom score moves over a couple of weeks. Do not let it delay a proper look at rib pain, breathlessness, reflux or a swelling under the arm, because those have causes worth finding.