Xiaxi

What is GB43?

GB43, or Xiaxi, is an acupressure point on the top of the foot, in the web between the fourth and fifth toes. Its name is usually translated as "Pinched Ravine", a reference to the narrow gap between the two toe bones.

In classical Chinese medicine GB43 is the Ying-spring point of the Gall Bladder channel and its water point. Traditional texts group it with complaints at the far end of that channel: one-sided and temple headaches, ringing in the ears, red or sore eyes, dizziness, and pain along the ribs. Practitioners also describe it as a point for "clearing heat" from the head.

Two things are worth separating before you read any further. First, long traditional use is not evidence that a point works; a claim repeated for two thousand years is still a claim. Second, long traditional use is not evidence that a point is safe for you, because the people writing those texts did not know about blood thinners, diabetic nerve damage, or your particular foot.

The honest verdict on the evidence is short: there is essentially no human research testing GB43 on its own. It turns up inside multi-point acupuncture protocols for tinnitus and migraine, but those studies cannot tell you what any single point contributed. That is different from a point like PC6, where controlled trials for nausea genuinely do exist.

So what does that leave? A traditional point with a well-agreed location, a low risk of harm for most people, and no reliable proof of effect. Pressing it is cheap, drug-free and usually harmless, and some people find the firm pressure itself calming. Treat it as a comfort measure you are trying, not a treatment you are receiving, and keep using whatever your doctor has prescribed. Everything described on this page is self-applied finger pressure.

Where is GB43 and how do you find it?

GB43 sits on the top of the foot, in the soft hollow just behind the web where the fourth and fifth toes split apart.

• Start at the little toe. Sit down and rest the foot on the opposite knee so you can see the top of it. Find the little toe, then move one toe inwards to the fourth toe.
• Find the split. Run a fingertip into the V-shaped notch where the skin of the fourth and fifth toes separates. That notch is your reference mark.
• Slide back towards the ankle. Move about half a thumb-width, roughly 1 cm, back from the edge of the web. In traditional measurement this is 0.5 cun behind the web margin.
• Feel for the gap. You should land in a soft dip between the two long toe bones, not on top of either one. Wiggle the fourth and fifth toes and you will feel the bones move on each side of your finger.
• Check both feet. GB43 is a paired point, one on each foot, in the same spot on each side.

A useful contrast helps you avoid the neighbouring point. GB44 is right at the corner of the fourth toenail, out on the toe itself. If your finger is on a toenail, you have gone too far forward. If you are on the hard ridge of bone halfway up the foot, you have gone too far back.

The area is thin-skinned, so the dip is easy to feel once you are close. Many people notice the spot is slightly tender compared with the surrounding skin. Tenderness is a common way practitioners confirm a point, but it is not a diagnosis and it does not mean anything is wrong with you.

How do you apply pressure to GB43?

1. Get comfortable first. Sit in a chair and bring the foot up onto the other knee, or sit on the floor with the knee bent. You want to reach the foot without straining your back.
2. Check the skin. Look between the toes before you press. Skip the point entirely if the skin there is cracked, raw, weeping, or peeling.
3. Place a fingertip or thumb tip. Use the pad of your thumb or index finger on the hollow behind the web of the fourth and fifth toes. A fingernail is too sharp for this small, bony spot.
4. Press straight down, gently. Build up slowly to firm but comfortable pressure. A reasonable target is a four or five out of ten, where ten is pain. Sharp or burning pain means ease off immediately.
5. Hold or circle. Hold steady for 30 to 60 seconds, or make small slow circles for the same length of time. Breathe normally; do not hold your breath.
6. Repeat on the other foot. Most traditional routines use both sides. Do the second foot the same way.
7. Keep sessions short. Two or three rounds per foot is plenty in one sitting. Twice a day is a common pattern, and more is not better.

Stop straight away if you feel numbness, pins and needles, a sharp jolt, or spreading pain in the foot. Stop also if the skin reddens and stays red, or if the spot is still sore the next day.

Use finger pressure only. Do not use pens, hard massage tools with points, clamps, or anything that could break the skin. The skin between the toes is thin and heals slowly, especially if your circulation is poor.

What is GB43 traditionally used for?

• Temple and one-sided headache. The Gall Bladder channel is described as running over the side of the head, so distal points like GB43 were used for pain there. Acupuncture as a whole has moderate trial support for migraine prevention, but those trials used many points together and none isolate GB43.
• Tinnitus and ear fullness. Classical texts list ringing in the ears and reduced hearing among GB43's uses. Human trials of acupuncture for tinnitus exist and are mostly small, unblinded and mixed, with no evidence singling out this point.
• Red, sore or tired eyes. Tradition links the outer corner of the eye to this channel and used GB43 for eye heat and pain. There is no controlled human research testing finger pressure here for eye symptoms.
• Dizziness. Listed in older sources alongside headache as a "head and ear" complaint. No useful human evidence supports it, and new or severe dizziness needs a medical assessment, not a pressure point.
• Rib and flank pain. The channel is traditionally described as passing along the side of the trunk, so GB43 appears in that context. This is a traditional reasoning chain, not a tested finding.
• Jaw and cheek swelling. Classical lists mention swelling of the cheek and sore throat. Any facial swelling with fever or trouble swallowing is a reason to see a doctor the same day.
• General tension and winding down. Many people simply find slow, firm pressure on the feet relaxing. That effect is real enough to be worth having, but it is non-specific and does not confirm anything about GB43 in particular.

Across all of these, the pattern is the same: a long traditional record and almost no point-specific human testing. Treat GB43 as something you are trying, and keep your prescribed treatment going unchanged.

Are there tips for using GB43 effectively?

• Find the gap, not the bone. The point sits in a soft dip between two toe bones. If your finger feels a hard ridge, slide sideways a few millimetres until it drops into the hollow.
• Use a small contact area. This is a narrow space. The tip of a thumb or index finger works far better than a broad flat press with the whole thumb pad.
• Warm the foot first. Cold feet are stiff and less comfortable to press. A warm shower or a minute of rubbing the foot makes the spot easier to find and easier to tolerate.
• Work both feet. Traditional routines treat GB43 as a pair. Doing both sides also keeps the session balanced and takes only a minute or two.
• Pair it with rest, not multitasking. If you are using it for a headache, sit somewhere dim and quiet while you press. Much of the benefit people report may come from the pause itself, which is still worth having.
• Keep a simple note. Write down the date, the symptom, and your rating out of ten before and after. Over a few weeks this tells you more than any article can about whether it helps you.
• Trim and clean. Short nails and clean hands matter here, because the skin between the toes is thin and this area holds moisture.
• Give it a fair but limited trial. Two weeks of consistent use is enough to form an impression. If nothing has shifted, stop rather than escalating the pressure.

One more practical point: comfort is the ceiling. Pressing harder does not make a point work better, and on a small bony area it mainly leaves you with a bruise.

What do people get wrong with GB43?

• Expecting a cure. No acupressure point cures migraine, tinnitus or eye disease, and anyone promising that is selling something. GB43 is a comfort measure at best.
• Pressing GB44 instead. GB44 is at the corner of the fourth toenail, out on the toe. GB43 is further back, in the hollow behind the web. If you are touching a nail, you have overshot.
• Landing on the bone. People press the hard ridge of the fourth or fifth toe bone rather than the soft gap between them. It hurts more and misses the described spot entirely.
• Using a hard tool. Pen caps, knuckle tools and massage spikes concentrate force on thin skin. Fingers only, every time.
• Ignoring the skin between the toes. This is a classic spot for athlete's foot and cracked skin. Pressing a damp, split area can push an infection deeper.
• Grinding away at it. Long, hard sessions bruise the foot and make it sore to walk on. Thirty to sixty seconds at a comfortable pressure is the usual guidance.
• Dropping prescribed treatment. Some people stop migraine medication or skip a hearing appointment because they have started pressing a point. That swaps something tested for something untested.
• Reading tenderness as a diagnosis. A sore spot on the foot tells you the foot is sore. It does not reveal anything about your gall bladder, your liver or your general health.
• Treating a red flag at home. A sudden worst-ever headache, one-sided hearing loss, or sudden vision change is an urgent medical problem, not a reason to press harder.

What does the research on GB43 actually say?

There is no useful human research testing GB43 on its own, and that is the honest summary. No controlled trial we can point to has isolated this single point for headache, tinnitus, dizziness or eye symptoms, by needling or by finger pressure.

What does exist is indirect. GB43 appears as one item in multi-point acupuncture protocols, particularly in studies of migraine and of tinnitus. Trials of acupuncture for migraine prevention are reasonably numerous and some show benefit against usual care, though the gap narrows sharply against sham acupuncture. Tinnitus trials are smaller, often unblinded, and their results are inconsistent. In every case the protocol used eight or ten points together, so nothing in the results can be assigned to GB43 specifically.

It also matters that those trials used needles. This page describes self-applied finger pressure, which is a different intervention with a different dose and a different sensation. Borrowing a needling result to support an acupressure claim is a stretch, and we are not going to make it.

The general acupressure literature has the same weaknesses throughout: small groups, short follow-up, no credible blinding, and a lot of room for expectation to shape what people report. Those problems hit subjective symptoms like headache and ear noise hardest, because the only outcome is what the participant says afterwards.

Practically, this means you should judge GB43 by your own experience and keep your expectations modest. Track your symptoms honestly for a couple of weeks. If pressing the point helps you relax or takes a small edge off a headache, that is a real benefit to you, even though it is not proof the point does anything specific. If nothing changes, nothing is lost but a few minutes.