Fu'ai

What is SP16?

SP16 (Fu'ai) is an acupressure point on the upper abdomen, about four finger-widths out from the midline and three thumb-widths above the navel.

It is the sixteenth point of the Spleen channel. The pinyin name Fu'ai is usually translated as "Abdominal Lament" or "Abdominal Sorrow". Classical texts link that name to complaining, groaning bellies: cramping pain, poor digestion and disordered bowels.

In traditional practice SP16 is a local abdominal point rather than a famous distal one. Teachers reach for it when the discomfort sits in the upper belly, just under the ribs. It is taught in most point curricula, but it is used far less often than neighbours such as SP15 (Daheng) or ST25 (Tianshu).

Two things are worth saying once, clearly, before the rest of this page. First, a point having 2,000 years of traditional use is not evidence that it does anything measurable in the body. Second, long use is not evidence that it is safe for you; the abdomen holds organs that do not enjoy firm pressure, and some people should leave this area alone entirely. Both points apply to everything below, so they are not repeated in every section.

The honest verdict on evidence: there are no controlled human trials testing SP16 on its own for any condition. Acupressure research as a whole is mostly small, short-term and unblinded, meaning participants knew what they were getting. Where a point does have good human evidence, this library says so plainly; PC6 for nausea is the clearest example in the literature. SP16 is not in that category. What exists is tradition, plus general studies of abdominal massage and acupressure that used many points at once and cannot tell us what any single point contributed.

Treated as what it is, gentle self-applied pressure on a sore patch of belly, SP16 is a low-cost comfort measure. It is not a treatment for a diagnosed digestive disease, and it should never delay a proper look at persistent abdominal symptoms.

Where is SP16 and how do you find it?

SP16 sits on the upper abdomen, level with a spot three thumb-widths above your navel, and about four finger-widths out to the side of the midline.

• Lie down first. Lie on your back with your knees bent and feet flat. This softens the abdominal wall and makes the landmarks much easier to feel.
• Start at your navel. Put one fingertip in the centre of your belly button. This is the fixed reference for everything that follows.
• Move up three thumb-widths. Travel straight up the midline about 6 to 7 cm (roughly three widths of your own thumb at the knuckle). You are now level with SP16, but still on the centre line.
• Move out four finger-widths. From that level, slide sideways about 7 to 8 cm, which is roughly the width of your four fingers held together. Do this on whichever side you want to work.
• Check what is under your hand. You should be on soft abdominal wall, just outside the firm vertical band of the central "six-pack" muscle. In many people this lands close to the lower edge of the ribcage.
• Feel for the rib border. Trace the bony curve of your lower ribs with your fingers. SP16 lies at or just below that curve, never on top of the hard rib itself.

Classical texts place SP16 three cun above the umbilicus and four cun lateral to the front midline. One cun is roughly the width of your own thumb, so the measurement scales to your body rather than to a fixed number of centimetres.

The point is bilateral, meaning there is one on each side. Do not expect a dramatic landmark. Most people find a slightly tender, slightly tighter patch of abdominal wall rather than an obvious hollow. If you cannot find anything distinct, work the general area with a flat hand instead of hunting with a fingertip.

How do you apply pressure to SP16?

1. Pick your moment. Wait at least an hour after a large meal. Pressing a full stomach is uncomfortable and can make reflux worse.
2. Get comfortable. Lie on your back with knees bent, or sit leaning back in a chair. A tense abdomen resists pressure and tells you nothing.
3. Warm your hands. Rub your palms together for a few seconds. Cold fingers make the belly guard and tighten.
4. Use flat finger pads. Place two or three fingertips flat on the point. Never use a knuckle, a thumb tip, or any hard tool on the abdomen.
5. Press gently and slowly. Sink in over three or four seconds until you feel mild pressure or slight tenderness, no more. Comfortable pressure on the belly is much lighter than on a shoulder.
6. Breathe with it. Hold for 30 to 60 seconds while breathing out slowly. You can also make small, slow circles instead of a static hold.
7. Release gradually. Lift your fingers over a couple of seconds rather than snapping away. Repeat on the other side.
8. Keep sessions short. One to three minutes per side, once or twice a day, is plenty. More is not better here.

Stop straight away if the pressure causes sharp pain, nausea, dizziness, or pain that spreads elsewhere. Stop if you feel a lump, a pulsing mass, or an area that is firm and tender in a way the other side is not.

Who should avoid it

• Anyone pregnant or possibly pregnant. Abdominal points are routinely avoided in pregnancy; skip SP16 entirely.
• Recent abdominal or chest surgery. Do not press over fresh incisions, healing scars, drains or ports.
• Known or suspected enlarged spleen or liver. This includes glandular fever (infectious mononucleosis), where firm pressure on the upper abdomen carries a real risk.
• Hernias, lumps and aneurysms. Never press over a bulge, a hernia repair mesh, or a pulsing mass in the belly.
• Damaged skin or fresh rib injury. Avoid broken skin, rashes, bruising, and any recently fractured or badly bruised lower rib.

When to see a doctor

Seek urgent care for sudden severe belly pain, a rigid board-like abdomen, blood in your stool or vomit, or fever with pain. See a doctor within days for abdominal pain, bloating or bowel changes lasting more than two weeks, or any unexplained weight loss.

What is SP16 traditionally used for?

• Upper abdominal pain and cramping. This is the core classical use and the source of the name Fu'ai. No trial has tested SP16 alone for abdominal pain, so this rests on tradition and on the ordinary comfort of warm, gentle pressure on a sore belly.
• Indigestion and food stagnation. Traditional texts describe SP16 for a heavy, stuck feeling after eating and for undigested food in the stool. Human evidence specific to this point is absent; general abdominal massage studies exist but used whole-hand techniques over wide areas, not one point.
• Constipation and irregular bowels. Tradition lists SP16 among abdominal points for sluggish bowels. Acupressure and abdominal massage trials for constipation are mostly small, unblinded and used multi-point protocols, so they cannot show what SP16 contributed.
• Dysentery-type diarrhoea. Classical sources mention SP16 for diarrhoea with pus or blood. This is a historical claim only. Blood in the stool needs medical assessment, not finger pressure.
• Discomfort under the ribs. Because the point sits near the costal margin, it is used traditionally for tightness or aching below the ribs. There is no human research on this use.
• General relaxation of the abdominal wall. Slow pressure with long out-breaths tends to reduce guarding and tension anywhere on the body. This is a plausible, non-specific effect and is not unique to SP16.

Across all of these, the pattern is the same: a long traditional record and almost no point-specific human data. That does not make the point useless as a comfort measure. It does mean no one can honestly tell you that SP16 treats a digestive condition. If a symptom is new, severe, or lasting, the right next step is a diagnosis, not more pressing.

Are there tips for using SP16 effectively?

• Work both sides. SP16 exists on the left and the right. Treating only one side is a common oversight; the sensation often differs between them, which is normal.
• Let the out-breath do the work. Sink in as you breathe out and hold steady as you breathe in. The abdominal wall softens on the exhale, so you need far less force.
• Go lighter than you think. On the belly, moderate is already too much. Mild tenderness is the ceiling, not the target.
• Use a flat contact. Two or three finger pads spread the load. A single digging fingertip is uncomfortable and adds nothing.
• Keep the area warm. Warm hands, a warm room, or a hot-water bottle on the belly beforehand all help the muscles let go. Avoid heat that is hot enough to redden skin.
• Pick a consistent time. Mid-morning or before bed works for most people. Routine makes it easier to judge whether anything is actually changing.
• Keep a simple note. Record the symptom score out of ten before and after, for two weeks. Self-applied techniques feel more effective than they are, and a note keeps you honest.
• Combine it with the basics. Fluid, fibre, movement and regular meals do more for digestive comfort than any point. Treat SP16 as an add-on, never a replacement.
• Respect new sensations. If the point feels different from last week in a way you cannot explain, stop and get checked rather than pressing harder.

One practical note on expectations. Any effect you notice from abdominal pressure tends to arrive within minutes and fade within hours. If you are hoping for something that builds over months, there is no evidence SP16 delivers that.

What do people get wrong with SP16?

• Expecting a cure. This is the biggest error. SP16 is not a treatment for irritable bowel syndrome, ulcers, gallstones or any other diagnosis, and nothing about it is guaranteed.
• Pressing far too hard. People transfer shoulder-strength pressure to the belly. The abdominal wall is thin and the organs underneath are not padded; firm digging is both useless and risky.
• Landing on the ribs. SP16 sits on soft abdominal wall at or just below the lower rib border, not on the bone. Pressing a rib gives sharp, pointless pain.
• Confusing it with SP15. SP15 (Daheng) is lower and wider, level with the navel. SP16 is roughly three thumb-widths higher. Describing one and pressing the other is common in short videos.
• Measuring with someone else's hand. Cun measurements scale to your own body. Use your own thumb and finger widths, not a fixed centimetre figure copied from an article.
• Doing it on a full stomach. Pressing after a big meal can trigger reflux, nausea or cramping. Wait an hour or more.
• Pressing through new pain. Treating an undiagnosed, worsening belly pain with acupressure wastes time that may matter. Sudden severe pain needs assessment, not massage.
• Using tools on the abdomen. Massage sticks, balls and pressure gadgets concentrate force dangerously here. Fingers only.
• Ignoring who should skip it. Pregnancy, recent abdominal surgery, a hernia, a pulsing mass, or an enlarged spleen all mean hands off this area completely.

A final one worth naming: treating tradition as proof. Fu'ai has been listed for centuries, and that tells you what practitioners believed, not what the point does.

What does the research on SP16 actually say?

No useful human research on SP16 specifically was found. There are no controlled trials, and no reliable observational studies, that tested pressure or needling at Fu'ai on its own for abdominal pain, indigestion, constipation or anything else.

That absence is normal rather than suspicious. Trial funding goes to a handful of well-known points, and most of the roughly 360 classical points have never been studied in isolation. SP16 is a minor local point even within tradition, so it has attracted no research attention at all.

What does exist sits one or two steps away from this point. Published trials of acupuncture and acupressure for functional digestive problems and for constipation generally use multi-point prescriptions, often including abdominal points on the Stomach and Conception Vessel channels. Where SP16 appears at all, it appears inside such a bundle. A study like that cannot tell you what any single point contributed, even when the bundle as a whole showed a small benefit.

There is also a separate literature on abdominal massage for constipation in adults, including some randomised studies in nursing and rehabilitation settings. Those results are mixed but not unpromising. They are, however, about broad whole-hand massage of the abdomen, not about targeted pressure at a named point. Borrowing their findings for SP16 would be dishonest.

The quality limits that affect acupressure research in general apply here too. Studies tend to be small, run for a few weeks, and are rarely blinded, because a person usually knows whether their belly is being pressed. Expectation alone produces real symptom improvement in digestive complaints, which is exactly where unblinded designs are weakest.

What this means for you is simple. If you find SP16 soothing, that is a reasonable reason to use it gently. It is not a reason to delay investigation of persistent abdominal symptoms, and no one can tell you honestly how much of the effect is the point and how much is warmth, rest and attention.