Shuidao

What is ST28?

ST28 (Shuidao, 'Waterway') is a Stomach channel point on the lower belly, about four finger-widths below the navel and a little out to the side.

Its Chinese name points to its traditional job. Classical texts group it with the lower abdominal points used for the body's handling of fluid: difficulty passing urine, a swollen or full-feeling lower belly, and period problems. It sits level with CV4 (Guanyuan), a point many readers will have seen named alongside it.

ST28 is taught in every standard acupuncture curriculum, so it is a real, well-defined point rather than an internet invention. But being old and widely taught is not the same as being proven. Traditional standing is not evidence that a point does anything, and it is not evidence that pressing it is safe for you — those are separate questions, and this page answers them separately.

The honest verdict on evidence: there is essentially no human research testing finger pressure on ST28 by itself. The point turns up inside multi-point acupuncture protocols for urinary and menstrual complaints, which tells you nothing about what one fingertip on one spot does. Most acupressure research in general is small, short, and unblinded, meaning people knew what they were getting, so expectation can account for much of the benefit reported.

What ST28 reasonably is: a comfortable, low-risk spot for gentle self-massage of a tense lower abdomen, for most healthy non-pregnant adults. What it is not: a treatment for urinary retention, a fertility method, or a replacement for seeing a doctor about blood in your urine, a missed period, or pain that is getting worse. Because it lies over the bladder, bowel and uterus, the safety section on this page matters more than it would for a point on your hand.

Where is ST28 and how do you find it?

ST28 sits on the lower abdomen, three thumb-widths below the centre of the navel and two thumb-widths out to the side of the midline.

• Start at the navel. Lie on your back with your knees bent and feet flat, so the belly wall is soft. Put one fingertip in the centre of your navel as your zero mark.
• Measure straight down. From the navel, move down the midline by about four finger-widths held together — the classical 3 cun. On most adults that is roughly 7 to 8 cm. You should now be on the midline, well below the navel and above the pubic bone.
• Check against the pubic bone. Feel for the firm bony ridge low in the front of your pelvis. The midline point you just found sits about two-fifths of the way up from that bone to the navel. If you have landed on bone, you have gone too far down.
• Move out to the side. From that midline spot, slide sideways by about two thumb-widths, roughly 4 to 5 cm, onto the soft belly. That is ST28. There is a left and a right one.
• Confirm by feel. You are over the straight abdominal muscle, not on bone. Many people notice a slightly fuller or more tender feel here than on the surrounding belly, especially before a period.

Two neighbours cause confusion. ST25 is much higher, level with the navel itself. ST29 is one thumb-width lower than ST28. If your finger is beside the navel, you are on ST25, not ST28.

If your belly is soft, tender or you simply cannot judge the distance, do not force a precise answer. The agreed landmark is the midpoint zone between navel and pubic bone, just off the midline. Working gently in that general area is the conservative approach, and nothing on this page involves needles or skin-breaking of any kind.

How do you apply pressure to ST28?

1. Empty your bladder first. Pressing the lower abdomen over a full bladder is uncomfortable and pointless. Go to the toilet, then settle.
2. Lie down with knees bent. On your back, knees up, feet flat. This lets the abdominal wall go slack, so you are pressing soft tissue instead of a braced muscle.
3. Warm your hands. Rub your palms together for a few seconds. Cold fingertips on the belly make people tense up and guard.
4. Place two fingertips. Use the flat pads of your index and middle fingers on ST28, not a nail or a knuckle. Many people work both sides at once with one hand each.
5. Sink in slowly as you breathe out. Over three or four seconds, press straight down to a firm but easy pressure — somewhere around a 3 or 4 out of 10. It should feel like a dull, spreading fullness, never sharp.
6. Hold or circle gently. Either hold still for 30 seconds to 2 minutes, or make small slow circles. Keep breathing normally; do not hold your breath or brace your stomach.
7. Release gradually. Lift out over a few seconds rather than snapping your hand away. Rest a moment before sitting up.
8. Repeat sensibly. Once or twice a day is plenty. A few minutes per side is enough; longer or harder is not better on the abdomen.

Stop straight away if you feel sharp pain, a sudden urge to be sick, light-headedness, or pain that lingers after you let go. Also stop and move your hand if you feel a strong pulse beating back against your fingers — that is a blood vessel, and it should never be pressed down on.

Keep pressure light if you bruise easily, take blood-thinning medicine, or have recently had any abdominal or pelvic procedure. Finger pressure only: no needling, no burning herbs on the skin, no cups.

What is ST28 traditionally used for?

• Difficulty passing urine. This is the classical headline use — the name 'Waterway' refers to it. ST28 appears in old texts for scanty, held-up or painful urination. There is no controlled human trial of pressing ST28 for this, and urinary retention is a medical problem, not a self-care one.
• Lower abdominal fullness and bloating. Tradition describes ST28 for a tight, distended feeling low in the belly. Gentle abdominal massage can feel soothing and may help you relax, but no study shows ST28 specifically relieves bloating.
• Fluid retention and puffiness. Classical sources link the point to the body's handling of water, including swelling. Modern evidence does not support acupressure as a treatment for oedema (fluid swelling), which always needs a cause found.
• Period pain and irregular periods. ST28 is often listed in menstrual point groupings. Acupressure for period pain has some small, short, unblinded trials, but they mostly used SP6 on the ankle, not ST28, so the support does not transfer to this point.
• Fertility and uterine complaints. Traditional texts mention ST28 for lower abdominal masses and infertility. There is no credible human evidence that pressing it affects fertility, and claims of that kind should be treated with real scepticism.
• Lower belly tension after stress. Many people simply find slow, warm pressure on a tight abdomen calming. That is a plausible comfort effect from relaxation and touch, not a channel-specific result.

The pattern across the list is the same: long traditional use, almost no point-specific human research. Use ST28 as a comfort measure if it feels good, and keep your actual diagnosis in the hands of a clinician.

Are there tips for using ST28 effectively?

• Find it lying down, use it lying down. A standing or seated belly is braced. Knees bent and flat on your back gives you an accurate landmark and much more comfortable pressure.
• Let the exhale do the work. Sink in as you breathe out and hold steady as you breathe in. This stops you fighting your own abdominal muscles and keeps the pressure gentler than you think it is.
• Work both sides. ST28 is paired, left and right. Treating only one side is common and there is no reason for it; one hand on each side for the same length of time is simpler.
• Add warmth, not heat. A warm hand, a warm shower beforehand or a covered heat pack on a low setting makes the area easier to work with. Never use anything hot enough to redden the skin.
• Pick a calm time. Before bed or during a quiet half hour works better than squeezing it in while rushing. Much of what people get from acupressure is the pause itself, and that is worth having.
• Keep a short log. Note the date, what you did, and how you felt an hour later. Over a few weeks this tells you honestly whether it is helping you, which no general article can.
• Give it a fair, bounded trial. Two weeks of daily use is enough to judge. If nothing has shifted, drop it rather than pressing harder or longer.
• Keep pressure light on a soft belly. The abdomen has no bone underneath to stop you. Firm but easy is the ceiling here; discomfort is a signal to back off, not to push through.

One more practical point: if you are using ST28 for urinary or menstrual symptoms, book the appointment anyway. Self-massage can run alongside proper assessment, but it should never be the reason you delay one.

What do people get wrong with ST28?

• Expecting a cure. The commonest mistake by far. ST28 is a comfort technique with almost no point-specific evidence behind it; it will not clear a urinary blockage, shrink a fibroid or fix infertility.
• Landing on ST25 instead. ST25 sits level with the navel. ST28 is four finger-widths lower. Many videos gesture vaguely at the belly, and viewers end up on the wrong point entirely.
• Pressing too deep. There is no bone under the lower abdomen to limit you. Digging in with a knuckle or thumbnail can bruise, and it is not more effective than steady, moderate pressure.
• Using it on a full, painful bladder. If you cannot pass urine and your lower belly is swollen and sore, pressing it is both painful and risky. That is an urgent medical problem.
• Working through sharp belly pain. Sudden, severe or worsening abdominal pain can mean appendicitis, an ectopic pregnancy or a blocked bowel. Pressure on it wastes time you may not have.
• Using it in pregnancy. ST28 lies directly over the uterus and is traditionally avoided in pregnancy. Whatever you think of the tradition, firm pressure there is not a sensible thing to self-apply.
• Pressing on a pulse. If a strong beat pushes back at your fingers, move your hand. Never bear down on a pulsating spot in the abdomen.
• Treating a trial of acupuncture as proof. Studies that needled ST28 as part of a larger protocol say nothing about one finger on one point, and nothing about what needling did on its own.
• Replacing a check-up. Blood in urine, a missed period, unexplained swelling or new pelvic pain all need a diagnosis, not a massage routine.

What does the research on ST28 actually say?

There is essentially nothing. No useful human research testing finger pressure on ST28 on its own could be found, for any condition. That is an honest gap, not a hidden result, and it is the usual situation for individual acupressure points.

What does exist sits one step removed. ST28 appears from time to time inside multi-point acupuncture and electroacupuncture protocols for urinary and menstrual complaints, where practitioners needle several points together. Even when those studies report benefit, the design cannot tell you which point contributed what, and needling is not the same intervention as pressing with a fingertip. Reporting that a trial needled a point is just describing what the trial did; it is not a reason to think self-massage of that spot reproduces the result.

The wider acupressure literature is worth understanding, because it sets expectations. Most trials are small, run for a few weeks, and are unblinded — participants know whether they are receiving pressure. That design inflates self-reported outcomes like pain and bloating, which are exactly the outcomes ST28 is claimed for. Where acupressure does have decent support, it is point-specific and narrow: PC6 on the inner wrist for nausea and vomiting has repeated controlled human trials behind it. ST28 has no comparable body of work.

Acupressure for period pain has produced some small positive trials, but those overwhelmingly used SP6 above the inner ankle. That evidence belongs to SP6, not to ST28, and borrowing it across points is a common and misleading move in online articles.

What this means in practice: treat ST28 as unproven. If gentle pressure on your lower abdomen feels calming, there is little harm in it for most healthy non-pregnant adults. Judge it on your own experience over a couple of weeks, and do not let it stand in for investigation of a urinary, bowel or menstrual symptom.