Where Is the Flank Located on the Body? | Easy Landmark Map

People say “flank” in a lot of settings: a doctor’s visit, a gym cue, a massage appointment, even a tattoo placement chat. The tricky part is that many folks point to the waist, the hip, or the back and call all of it “flank.” Close, yet not quite.

This page pins it down in plain terms. You’ll learn what “counts” as the flank, how to find it on your own body in under a minute, what sits under it, and why that location matters when someone says “right flank” or “left flank.”

Flank Location On The Body With Landmarks You Can Feel

The flank is a paired region. You have a right flank and a left flank. It sits on each side of your trunk, starting under the lower ribs and running down to the upper border of the pelvis. It also wraps a bit toward the back, so it isn’t only a “side belly” area.

Two bones make the easiest borders to feel without any anatomy training:

• Lower ribs at the top edge (the lower rib margin).
• Iliac crest at the bottom edge (the top rim of the hip bone you can grab with your hands on your hips).

If you want a quick mental picture, think “ribs to hip,” on the side of your torso, drifting a bit toward the back.

Do This Two-Hand Check In 20 Seconds

1. Stand tall and relax your shoulders.
2. Place your hands on your hips like you’re about to strike a pose.
3. Slide your hands up a couple of finger-widths until you feel the bony ridge of the pelvis (that ridge is the iliac crest).
4. Keep your fingers there, then reach your other hand up to feel the lower ribs on the same side.
5. The soft zone between those two bony lines is your flank.

Now turn your torso a little, like you’re looking over your shoulder. That same “ribs to hip” band continues toward the back. That wraparound piece is still part of the flank in everyday medical use.

Front, Side, And Back: Where People Get Mixed Up

Most confusion comes from mixing three nearby areas:

• Waist: often used for the narrowest point of the torso. The flank overlaps it, but the waist can be more forward.
• Hip: the hip joint is lower and more side-front than the flank band.
• Lower back: the flank reaches toward the back, yet the spine itself is midline, not flank.

A clean way to sort it: if you can point to your spine, you’re past the flank. If you can point to your belly button, you’re too far forward. The flank lives in between, with a little wrap toward the back.

What “Right Flank” And “Left Flank” Mean In Plain Speech

“Right flank” means that ribs-to-hip band on the right side. “Left flank” means the same band on the left side. It sounds obvious, yet it gets fuzzy when pain spreads or when someone points to the front of the abdomen and calls it flank.

Clinicians use flank language because it’s a fast way to describe location without guessing at organ names. A note that says “tenderness at right flank” is a location marker, not a diagnosis on its own.

Why The Flank Wraps Toward The Back

On each side, the trunk curves. The flank follows that curve. That’s why “flank pain” is often described as being on the side of the lower back area, between ribs and pelvis, rather than purely on the side of the belly. Cleveland Clinic describes flank pain as affecting the area on either side of the lower back between pelvis and ribs, which matches how people usually point to it in real life. Cleveland Clinic’s flank pain description is a good reference for that everyday clinical usage.

MedlinePlus also frames flank pain as pain on one side of the body between the upper belly area and the back, which is another way of saying “side band that sits between front and back.” See the MedlinePlus flank pain overview for the same location language.

These are pain pages, yet the location definition is still useful when your real question is simply, “Where is that spot?”

Surface Boundaries You Can Use Without Guessing

Let’s lock in the borders with body landmarks you can feel on most adults:

Top Border: The Lower Rib Margin

Your rib cage slopes down as it moves toward the side. On many bodies, the lowest rib you can clearly feel is the 12th rib. You don’t need to count ribs to find the flank, though. Just feel the lower edge of the rib cage on the side, then note the soft space below it.

Bottom Border: The Iliac Crest

The iliac crest is the top ridge of the pelvis. It’s the “shelf” you feel when you hook your thumbs around your waistline and press in a bit. That ridge is a solid, repeatable lower border for the flank region.

Inner Border: The Side Seam Of Your Trunk

A handy way to find the inner edge is to trace an imaginary “side seam,” like the seam on a T-shirt. If you run your fingers down from the armpit area toward the hip, that line lands in the flank zone for much of the trip.

Outer Border: Toward The Back, Not The Spine

The flank extends toward the back, but it stops short of the spine. If you reach back and feel the bony bumps of the vertebrae, you’re on the midline. Move your hand a few finger-widths to either side and you’re in the back portion of the flank.

Britannica describes the flank as a portion of the body bounded by the lower ribs, the backbone, and the pelvis, which fits this “ribs-to-pelvis with a backward boundary” idea. The short Britannica note on flank anatomy captures that boundary language in a compact way.

What Sits Under The Flank

Under the skin, the flank is a stack of layers: skin, fat, fascia, muscle, then deeper structures. The exact depth and feel differ from person to person, yet the map stays steady.

Muscles You’re Touching When You Press The Flank

When you press into the side of the trunk, you’re often contacting a blend of abdominal wall and back-wall muscles, depending on where your hand sits.

• External oblique: more toward the side-front, involved in trunk rotation.
• Internal oblique: deeper layer under the external oblique.
• Transversus abdominis: deeper “wrap” layer that helps stiffen the trunk.
• Quadratus lumborum: more toward the back portion, near the lower ribs and pelvis.

This is why a sore flank can feel like “side abs,” “back,” or “both.” The flank is a meeting zone.

Organs Commonly Linked To Flank Talk

People often hear “flank” in kidney conversations. That’s because the kidneys sit toward the back of the upper abdomen, roughly under the lower ribs, with their side-back surface lining up with the flank area. Pain signals can spread, so location alone doesn’t prove the source. It still explains why flank language shows up so often in kidney stone and urinary notes.

RadiologyInfo (from the American College of Radiology and RSNA patient education) describes flank pain linked with stone suspicion as pain in the back of the torso between ribs and pelvis. Their Acute Onset Flank Pain appropriateness criteria page uses that same ribs-to-pelvis placement when discussing stone workups.

Not every flank sensation is kidney-related. Muscle strain, rib irritation, skin issues, and many other causes can sit in the same band. Location language is the start of the map, not the finish line.

Where Is the Flank Located on the Body?

If you want the simplest pinpoint, use this: put your hand on your side, then slide it back until your thumb nearly reaches the spine, then slide it down until your palm sits on the top rim of your hip bone. The soft area under your lower ribs, above that hip rim, under your hand, is the flank.

That’s the spot people mean when they say “right flank” or “left flank.” It’s also the spot that gets examined when a clinician checks side-back tenderness between ribs and pelvis.

How The Flank Changes With Posture And Body Position

Your bones don’t move much, yet your soft tissue shifts with posture. This can make the flank feel like it “moved,” even when the borders stayed put.

Standing

Standing tall makes the ribs-to-hip gap easier to feel. The iliac crest stands out, and the side tissue has a clear vertical stretch.

Sitting

Sitting can crease the side of the torso, especially if you slouch. That crease might sit across the flank band. People then point to the crease and call it “my flank,” which is close enough for everyday talk. For location clarity, use the bony borders again: lower ribs and iliac crest.

Lying On Your Side

Side-lying compresses the lower flank on the surface while stretching the upper flank. If you’re trying to identify a sore spot, note whether the sore point is on the “pressed” side or the “stretched” side. It helps you describe it clearly when asked.

Twisting

Twisting tightens obliques and can pull on the rib margin. A sharp side stitch during movement is often in the flank band, yet it may be more front-side than back-side. Saying “front flank” versus “back flank” can make your description clearer.

When Someone Says “Flank Pain,” What They Usually Mean

Flank pain is a phrase used for pain felt in that side band between ribs and pelvis, often leaning toward the back. The phrase doesn’t name a cause. It names a place.

MedlinePlus lists flank pain as pain in one side of the body between the upper belly area and the back, and it notes that many causes are possible. That placement description is on their Medical Encyclopedia flank pain page.

Cleveland Clinic also points to the area between pelvis and ribs on either side of the lower back on its flank pain overview. That matches how most people gesture when asked to show the spot.

Red Flags That Call For Medical Care

Location alone can’t sort harmless from urgent. Still, certain add-on signs can raise urgency. If flank pain shows up with fever, blood in urine, trouble passing urine, fainting, or severe unrelenting pain, get medical care the same day.

If you’re unsure how to describe what you feel, say three things: the side (right or left), the band (ribs to hip), and whether it sits more toward the back or more toward the side-front. That short description helps the listener picture the spot without guessing.

A Fast Self-Check You Can Repeat Any Time

Use this mini routine when you want to confirm you’re pointing to the flank and not the hip or mid-back:

1. Find the iliac crest with your hands on your hips.
2. Find the lower ribs on the same side.
3. Point to the soft area between them.
4. Move your finger slightly toward your back while staying between ribs and hip.
5. Stop before you reach the spine bumps.

That final point you land on is still within the flank region. If you can repeat this and land in the same place each time, you’ve got a reliable map.

Send us your feedbackTell us what you thought about this post

⚠Please use a real email you check. If it's fake or mistyped, your message won't reach us and we can't reply — wrong addresses are rejected automatically.

Name *Email *

Your comment *

Quick check — what is …? *

Send feedback