Qiangu

What is SI2?

SI2 (Qiangu) is a Small Intestine channel point on the ulnar edge of the little finger, just past the knuckle where that finger meets the hand.

Its Pinyin name, Qiangu, is usually translated "Front Valley", a nod to the small hollow you can feel there when you bend the finger. In classical Chinese medicine it is the second of six points on the Small Intestine channel, which is described as running from the little fingertip, up the ulnar side of the forearm, across the shoulder blade and up to the face and ear.

Within traditional theory SI2 is a "ying-spring" point, one of the five transporting points on each channel. Texts group it with points said to clear heat, and it was classically used for fever, sore throat, ear noise, eye pain, headache at the back of the head and numb or stiff fingers. Some older sources also list it for breast problems.

The honest verdict on evidence is short: there is essentially no human research testing SI2 on its own for any of these claims. Acupressure research overall is dominated by small, unblinded, short-term studies, and SI2 is not one of the points that has attracted even that. A few points do have decent trial support for a specific job — PC6 for nausea is the clearest example in the whole literature — but SI2 is not among them.

Two things are worth saying once, here, rather than at the top of every section. First, long traditional standing is not evidence that a point does anything; a claim repeated for centuries is still a claim. Second, traditional standing is not evidence of safety either. Safety has to be judged from what you are actually doing, which on this page is firm finger pressure on a small joint area of the hand.

That said, self-applied pressure on the side of your own little finger is a low-risk thing to try, as long as the skin and the joint underneath are healthy and you stop if it hurts. Everything below is finger pressure only — this library never gives needling, moxibustion or cupping instructions.

Where is SI2 and how do you find it?

SI2 sits on the little-finger side of your hand, in the small dip just beyond the knuckle where the little finger joins the palm.

• Find the pinky knuckle. Make a loose fist and look at the back of your hand. The last, smallest bump on the row of knuckles is the joint at the base of your little finger.
• Move to the outer edge. Slide your thumb to the outside edge of the hand, the side you would use for a karate chop. You are now on the ulnar border.
• Step past the knuckle. SI2 is on the far side of that joint, towards the fingertip, not behind it. Roughly a fingertip's width past the bump, about 1 cm on an average adult hand.
• Feel for the hollow. Bend the little finger a little. A soft depression appears at the end of the crease on the outer edge of the finger base. That dip is the point.
• Use the colour border. Classical texts place SI2 at the "red and white skin" line, where the darker skin of the back of the hand meets the paler skin of the palm. Follow that line along the finger edge.

A simple check: press gently and wiggle the little finger. You should feel soft tissue and a joint line moving under your fingertip, not the hard shaft of a bone.

Do not confuse SI2 with its neighbours. SI3, a more commonly used point, is on the same edge but behind the knuckle, towards the wrist. SI1 is right at the outer corner of the little fingernail. SI2 is the one in between, just past the knuckle on the finger side.

The point exists on both hands. Tradition does not treat one side as the "real" one, so pick whichever hand you can reach comfortably, or work both in turn.

How do you apply pressure to SI2?

1. Settle first. Sit down and rest the working hand in your lap or on a table. A supported hand lets you feel the hollow instead of chasing it.
2. Place the thumb. Put the pad of your opposite thumb into the dip just past the little-finger knuckle, on the outer edge. Curl your index finger under the hand to brace against it.
3. Press straight in. Use steady pressure angled towards the centre of the hand. Aim for firm but comfortable, around a 3 or 4 out of 10. It should feel like a deep ache, never a sharp or electric pain.
4. Hold and count. Keep the pressure for 30 to 60 seconds while breathing normally. Holding your breath tenses the forearm and makes the spot harder to feel.
5. Add small circles if you like. Some people prefer slow circular rubbing, roughly one circle per second, for the same length of time. Either method is fine; neither is proven better.
6. Release slowly. Ease off over a couple of seconds rather than lifting suddenly, then swap to the other hand if you want to repeat.
7. Repeat sensibly. Two or three rounds per session, and up to two or three sessions a day, is plenty for a small joint area.

Keep your nails short or press with the flat pad of the thumb. A nail edge on thin skin over a knuckle can break the skin, which is the main avoidable problem here.

Stop straight away if you feel sharp pain, pins and needles running into the finger, numbness that lingers, or if the skin reddens and stays sore. Mild tenderness for an hour or so is common; bruising is not, and means you pressed too hard.

This is finger pressure only. Never try to pierce, scratch, burn or scrape the skin at SI2, and never let an unqualified person do any of those things to you.

What is SI2 traditionally used for?

• Fever and "heat" signs. As a ying-spring point, SI2 was classically chosen to clear heat, meaning fevers, flushed face and a burning sore throat. No human trial has tested finger pressure at SI2 for fever, and nothing here should replace proper assessment of a fever.
• Sore throat. Old texts list throat swelling and pain among its main uses. Evidence specific to SI2 is absent. A sore throat with difficulty swallowing or breathing needs a doctor, not a pressure point.
• Ear symptoms. Tinnitus (ringing in the ears) and deafness appear in the classical indications, because the channel is described as ending near the ear. Acupuncture research on tinnitus as a whole is mixed and mostly low quality, and none of it isolates SI2.
• Headache at the back of the head and neck. Tradition uses Small Intestine channel points for stiffness and pain along the back of the neck and skull. Some acupressure trials for tension headache exist, but they use multi-point protocols and do not tell us anything about SI2 alone.
• Numb, stiff or painful fingers. Local use is the most intuitive claim: the point sits right on the little-finger joint. Gentle self-massage around a stiff joint may feel good, though that is general massage comfort rather than proof of a channel effect.
• Eye pain and redness. Listed in several classical sources, usually alongside other heat indications. There is no human evidence for this use.
• Breast and milk-flow problems. A few older texts mention SI2 for breast swelling or scant milk. This is a tradition-only claim with no supporting trials, and breast pain, lumps or infection need medical review.

Taken together, SI2 is a well-catalogued traditional point with a thin evidence file. Trying it for comfort is reasonable; relying on it instead of treatment is not.

Are there tips for using SI2 effectively?

• Bend the finger to open the dip. With the little finger straight, the hollow at SI2 almost disappears. A slight bend makes the crease and the depression easy to feel.
• Work both hands. Tradition treats the channel as paired. Doing 30 seconds on each hand also stops you overworking one small patch of skin.
• Use the thumb pad, not the tip. The flat pad spreads the force over the joint. The tip, especially with a nail, concentrates it and tends to sting.
• Warm the hand first. Cold hands are stiff and less sensitive. Thirty seconds under warm water or rubbing the palms together makes the landmark easier to locate.
• Keep a simple note. If you are trying SI2 for something recurring, write down when you pressed and what happened over a week or two. Most short-term changes are normal day-to-day variation, and a note helps you see that honestly.
• Pick a consistent time. Linking the routine to something you already do, such as sitting down with a morning drink, makes it more likely you will actually do it.
• Match the pressure to the hand. Thin skin over small finger joints needs less force than a thick calf muscle. If you leave a mark, you used too much.
• Stop at the tender point, not past it. A dull ache means you are on soft tissue. Sharp or shooting sensation means you have caught a nerve or pressed the joint itself, so ease off and reposition.
• Treat it as comfort, not treatment. Use SI2 alongside the things that actually have evidence for your problem, such as fluids and rest for a sore throat, or a doctor's advice for persistent ear noise.
• Set a time limit. If two weeks of regular use has changed nothing, the honest conclusion is that it is not doing much for you, and your time is better spent elsewhere.

What do people get wrong with SI2?

• Pressing SI3 by mistake. The most common error. SI3 sits behind the little-finger knuckle, towards the wrist; SI2 is just past it, towards the fingertip. Videos often blur the two.
• Landing on bone. People press the hard bump of the knuckle itself instead of the soft dip beyond it. If your thumb is on something unyielding, slide a few millimetres towards the fingertip.
• Working the back of the hand. SI2 is on the outer edge, on the red-and-white skin line, not up on the hairy back surface. Roll your thumb to the karate-chop side.
• Expecting a cure. No acupressure point cures infection, hearing loss, migraine or anything else. Treat SI2 as a self-care habit that may or may not feel helpful, and nothing more.
• Digging with a fingernail. The skin over this joint is thin. A nail edge can break it, and broken skin on the hand is an easy route for infection.
• Pressing a joint that is already angry. If the little-finger knuckle is swollen, hot or flaring from arthritis or gout, pressure makes it worse rather than better.
• Marathon sessions. Ten minutes of hard grinding does not beat one minute of steady pressure. It just leaves the area bruised and sore.
• Delaying real care. Using SI2 for a worsening sore throat, a high fever or sudden hearing change wastes time that matters. Press the point if you like, but get seen.
• Assuming old means proven. Centuries of use tells you the point was valued, not that it works. Those are different questions.
• Trying anything beyond pressure. Some sources describe needling or heat at hand points. Do not attempt either on yourself; this page is self-applied finger pressure only.

What does the research on SI2 actually say?

No useful human research on SI2 specifically was found. There is no controlled trial, and no good observational study, testing finger pressure at Qiangu for fever, sore throat, tinnitus, headache or finger stiffness.

That is not unusual. The acupressure and acupuncture trial literature concentrates on a handful of points, and even those studies are often small, unblinded and short-term. PC6 for nausea and vomiting is the clearest exception, with repeated controlled trials behind it. SI2 has nothing comparable.

Where Small Intestine channel points do appear in trials, they are almost always needled, and almost always as one item in a multi-point prescription chosen by a practitioner. Even if such a study reports a benefit, it cannot tell you what SI2 contributed, or whether self-applied thumb pressure would do the same thing. Reporting that a trial needled a point is simply describing what the researchers did; it is not a reason to try needling at home.

What does this absence mean for you? It means any claim you read about SI2 producing a specific result rests on tradition and on individual practitioner reports, not on tested evidence. It does not prove the point is useless, because an untested thing is untested, not disproven. But it does mean you should keep your expectations low and your spending lower.

It also means the sensible way to judge SI2 is personally and briefly. Try it for a couple of weeks, note what happens, and accept the result either way. Short-term changes in symptoms like headache or ear noise fluctuate naturally, so a single good day after pressing the point is weak information.

If anything on this page is ever contradicted by better research, the honest position is that the research wins. At the moment, there is simply very little to weigh.