Danshu

What is BL19?

BL19 (Danshu) is a point on the Bladder channel of the upper back, beside the spine at about the level of the tenth thoracic vertebra.

In classical Chinese medicine it is the back-shu point of the gallbladder. Back-shu points are a set of paired points running down either side of the spine, each traditionally linked to one internal organ. Danshu translates roughly as "gallbladder transport point", and it is taught in essentially every acupuncture curriculum and listed in the old texts.

Tradition used it for complaints it grouped under the gallbladder: a bitter taste in the mouth, pain under the right ribs, jaundice (yellowing of the skin), nausea, and alternating chills and fever. It was also used for plain mechanical things, like tight muscle along the mid-back.

Here is the honest verdict on the evidence. There is no good human research testing finger pressure on BL19 for any of these uses. The point shows up inside multi-point needling protocols in small, poorly controlled studies, which cannot tell you what BL19 itself did. Pressing it may feel pleasant on a tight back, and that is a reasonable expectation. A gallbladder effect is not.

Two things worth saying once, clearly, so they are not repeated on every section below. First, a long traditional pedigree is not evidence that a point works; age and popularity are not data. Second, that pedigree is not evidence that it is safe either. BL19 sits over the ribcage and the muscle beside the spine, and a few people genuinely should not press there, which is covered under "Who should avoid it".

Everything on this page is self-applied finger pressure. Nothing here involves needles, skin-breaking or burning herbs, and nothing here replaces medical assessment of abdominal pain. Gallbladder disease is a real, sometimes urgent, surgical problem. Treat BL19 as comfort and self-care, not as treatment.

Where is BL19 and how do you find it?

BL19 sits roughly two finger-widths to the side of the spine, three vertebrae below the bony tip at the bottom of your shoulder blade.

• Start at the shoulder blade. Reach back and feel the lowest point of one shoulder blade, the inferior angle. In most people, this lines up with the seventh thoracic vertebra (T7).
• Slide inward to the spine. Move your fingers straight across from that point to the knobbly line of spinous processes down the middle of your back. That knob is roughly T7.
• Count down three. Walk your fingertip down three bumps. The third one down is the tenth thoracic vertebra (T10). Counting on yourself is awkward, so a mirror or a helper makes this much easier.
• Drop to the lower edge. Find the bottom edge of that T10 bump. BL19 is level with this lower border, not level with the peak of the bump.
• Move out to the side. Go about 1.5 cun sideways from the midline. In practical terms that is the combined width of your index and middle fingers, roughly 3 to 4 cm on an average adult.
• Check what is under your finger. You should be on the thick ropey muscle running alongside the spine, not on bone. A point that feels hard and ridged means you are still on the spine itself.

BL19 is bilateral: there is one on each side. The tender, slightly ropey feeling under the fingertip is the usual confirmation most people get, and it is not a reliable test on its own.

If you cannot confidently count vertebrae, do not force it. What is agreed is the general region: the mid-back, below the shoulder blades, a couple of finger-widths off the spine. Working that whole band gently is safer and more honest than jabbing at a spot you have guessed.

How do you apply pressure to BL19?

1. Pick a workable method. Most people cannot reach their own mid-back comfortably. Lean a tennis ball or massage ball against a wall, use the knuckles of a backward-reaching hand, or ask another person to use their thumbs.
2. Get the body settled. Stand with your back to a wall, or sit leaning slightly forward. Let your shoulders drop. A braced, hunched posture makes the muscle harder and the pressure less useful.
3. Find the spot and settle in. Place the ball or fingertip on BL19 and press straight into the muscle, towards the front of the body, not angled in towards the spine.
4. Use moderate pressure only. Aim for a firm ache you could hold a conversation through, perhaps a 3 or 4 out of 10. Sharp, bright or shooting pain means ease off immediately.
5. Hold and breathe. Keep steady pressure for 30 to 60 seconds, or make slow small circles for the same time. Breathe out as you increase pressure.
6. Do both sides. Treat the left and right points equally, even if only one side feels tender.
7. Keep sessions short. Two or three rounds per side, once or twice a day, is plenty. More is not better and raises the chance of bruising.
8. Finish gently. Release slowly rather than snapping off the point, then move the shoulders through a few easy circles.

Stop straight away if you feel numbness, pins and needles, pain shooting down a rib or into a limb, dizziness, or nausea that worsens. Stop if the skin bruises or stays sore the next day, and leave the area alone for several days.

Never use a hard tool, an elbow drop or body weight on the spine itself. Finger, thumb, knuckle or a soft ball on muscle is the whole toolkit here.

What is BL19 traditionally used for?

• Gallbladder complaints. As the back-shu point of the gallbladder, BL19 was the classic choice for pain under the right ribs, gallstone-type pain and jaundice (yellowing of the skin). Human evidence for finger pressure here is absent, and gallstone disease needs a doctor, not a thumb.
• Bitter taste and nausea. Tradition linked a bitter mouth and queasiness to gallbladder disharmony and used BL19 for both. There is no trial testing BL19 for nausea. If nausea is your target, PC6 on the inner wrist has far better human evidence and is the sensible first choice.
• Rib-side and flank tension. BL19 was used for tightness and pain along the lower ribs. Nothing specific has been tested, though general back massage does reduce muscular discomfort in the short term, which may be most of what people feel here.
• Alternating chills and fever. Classical texts used BL19 within the shaoyang pattern, where someone feels hot then cold in turns. This is a traditional diagnostic category, not a modern one, and it has never been tested as an acupressure target.
• Mid-back muscle tightness. The most defensible use. BL19 sits on the erector spinae, the long muscle beside the spine, and firm pressure on tight muscle commonly brings short-lived relief. This is ordinary massage, and it is honest to call it that.
• Irritability and poor sleep. Some modern texts extend the gallbladder association to indecisiveness, irritability and broken sleep. This is pattern reasoning carried forward from tradition, with no supporting human research for BL19 specifically.

The pattern across the whole list is the same. BL19 has strong traditional standing and almost no point-specific human evidence. Short-term comfort from pressure on a tight back is realistic. Changing the behaviour of an internal organ is not something this point has been shown to do.

Are there tips for using BL19 effectively?

• Use a wall and a ball. The mid-back is the hardest region to reach on yourself. A tennis ball between your back and a wall gives steadier, more even pressure than a twisted arm ever will.
• Warm the area first. A few minutes under a warm shower, or a heat pack on the mid-back, softens the muscle so moderate pressure is enough. Cold, guarded muscle tempts people into pressing far too hard.
• Breathe out into the press. Increase pressure on a slow exhale and hold it steady. The ribcage drops on the out-breath, which makes the point easier to reach and the pressure more comfortable.
• Treat the whole band. If counting vertebrae defeats you, slowly work the strip of muscle running from below the shoulder blades down to the lowest ribs. You will cross BL19 on the way and the session is just as useful.
• Keep a simple record. Note what you pressed, for how long, and how you felt an hour later. Over a fortnight this tells you far more than one dramatic session does.
• Match it to the right problem. BL19 is a reasonable choice for a stiff, achy mid-back. For travel sickness or chemotherapy-related nausea, PC6 at the wrist has real trial support and deserves to be your first pick.
• Respect tenderness. A tender point is not a target to be beaten into submission. If it is still sore the following day, you pressed too hard, and the area needs a few days off.
• Ask for help. A partner using flat thumbs can hold even pressure far better than you can on yourself. Give them clear feedback on depth, and tell them to stop the moment anything feels sharp.

Keep expectations modest and timescales short. Any relief from finger pressure on BL19 tends to last minutes to hours, not days.

What do people get wrong with BL19?

• Pressing on the spine itself. The commonest error. If the surface under your finger feels hard and knobbly, you are on the spinous process, not on the muscle beside it. Move out about two finger-widths.
• Miscounting the vertebrae. People count from the neck and drift by two or three levels. Starting from the bottom tip of the shoulder blade, at roughly T7, and counting down three is far more reliable on a live back.
• Expecting a cure. BL19 will not dissolve gallstones, clear jaundice or fix a diseased gallbladder. Treating it as a cure delays real care, and delayed gallbladder infection can become a surgical emergency.
• Pressing through acute abdominal pain. Severe pain under the right ribs with fever, vomiting or yellowing skin is a reason to phone a doctor, not to massage your back. Pressure neither helps nor diagnoses it.
• Going far too hard. Elbows, hard tools and body weight on the mid-back bruise skin and can irritate the ribs. Moderate pressure held steadily achieves more than brute force.
• Marathon sessions. Ten minutes of grinding on one spot leaves the area sore for days. Thirty to sixty seconds, repeated two or three times, is the useful dose.
• Working one side only. BL19 is paired. Treating only the tender side often leaves the back feeling lopsided afterwards.
• Assuming the back-shu link is anatomical. "Gallbladder point" is a traditional naming convention. The gallbladder sits in the upper abdomen, well away from the skin you are pressing, and no one has shown that pressure here reaches it.
• Stopping prescribed treatment. People sometimes skip medication or a scheduled scan after a good session. Acupressure is an add-on to care, never a substitute for it.

What does the research on BL19 actually say?

There is no useful human research on finger pressure applied to BL19. No controlled trial has tested this point on its own for gallbladder pain, nausea, jaundice or back tension, and nothing here should be read as an evidence-backed treatment.

BL19 does appear in the acupuncture literature, but almost always buried inside a multi-point protocol. Small studies, mostly from China and mostly on biliary colic (gallstone pain) or inflammation of the gallbladder, have used needling at BL19 alongside points such as GB34, GB24 and ST36. Those studies share familiar problems: few participants, no credible sham comparison, unblinded assessors, and short follow-up. Even where a group improved, the design cannot tell you whether BL19 contributed anything at all, and the procedure used was needling by a practitioner, not self-applied pressure.

Research on back-shu points as a group is no stronger. They are frequently included in acupuncture protocols for digestive and sleep complaints, but trials rarely isolate a single point, so the specific contribution of BL19 stays unknown.

What does have reasonable support is general manual pressure on the back muscles. Trials of massage show modest, short-lived reductions in muscular back discomfort. That is a plausible explanation for most of what people notice when they press BL19, and it does not depend on the point being special.

For comparison, PC6 and nausea is the clearest positive case in the acupressure literature, with multiple controlled trials behind it. BL19 is nowhere near that standard, and saying so is not scepticism about acupressure in general. It is simply where the evidence currently sits.

The practical meaning is this. Use BL19 for comfort if it feels good, keep the pressure moderate, and do not let it stand in for the investigation of abdominal pain. If a future trial tests this point properly, this page will be updated.