What Is The Side Of Your Hand Called? | Radial Or Ulnar

The phrase “side of your hand” sounds simple, but different sides exist and each has a precise name. Clinicians, trainers, and therapists don’t say “the thumb side” or “the pinkie side” once notes or charts start. They use radial and ulnar for the edges, plus palmar and dorsal for the surfaces. This guide lays out what each term means, where it applies, and how to use the right word for everyday needs like pain notes, gym cues, glove sizing, or first-aid reports.

Hand Sides In Plain English

Stand or sit with your arms at your sides, palms forward. That standard stance is the reference for medical directions. With the palm facing forward, the thumb points away from the body. That puts the thumb edge of the hand on the lateral side, called the radial side. The little finger edge sits on the medial side, called the ulnar side. The palm itself is the palmar surface. The knuckle side is the dorsal surface.

The Quick Map Of Names

Term	Everyday Meaning	When You’d Use It
Radial Side	Thumb edge of the hand	Thumb sprain notes, wrist watch fit, thumb-side cuts
Ulnar Side	Little-finger edge of the hand	Ulnar wrist pain, karate-chop edge, glove seams
Palmar Surface	Palm side	Grip skin care, callus talk, tape placement
Dorsal Surface	Back of the hand	Knuckle scrapes, dorsal swelling, ring sizing checks
Thenar Eminence	Fleshy mound at thumb base	Thumb fatigue, median nerve checks, ergonomic tips
Hypothenar Eminence	Fleshy mound at little finger base	Ulnar nerve talk, palm pressure points, tool grip

What Is The Side Of Your Hand Called?

The edge along the thumb is the radial side. The edge along the little finger is the ulnar side. If a trainer, nurse, or coach asks which side hurts, pick one of those two labels, then add the surface: palmar (palm) or dorsal (back of hand). You can also add a spot name like thenar or hypothenar if the soreness sits in those fleshy mounds.

Why “Radial” And “Ulnar” Are The Chosen Words

These labels come from the forearm bones that line up with each edge of the hand. The radius sits on the thumb side, so anything toward that side is called radial. The ulna sits on the pinkie side, so anything toward that side is called ulnar. That bone-based naming keeps directions consistent from elbow to fingertip, even when the forearm rotates.

Thumb Side = Radial

The radius runs from the elbow to the wrist on the thumb side and joins the carpal row that feeds your palm. This is why clinicians say a “radial wrist sprain” when pain sits near the thumb edge of the wrist. You’ll also hear “radial deviation” when the hand moves toward the thumb side.

Little Finger Side = Ulnar

The ulna tracks the small-finger side down to the wrist. Pain at the pinkie-side wrist crease often gets labeled “ulnar-sided wrist pain.” Grip sports and keyboard habits can load that edge more than people realize. Movements toward the pinkie edge are “ulnar deviation.”

Surfaces: Palmar And Dorsal

Beyond edges, you also need surface names. The palm side is the palmar surface; skin here is thick, anchored, and made for grip. The back side is the dorsal surface; skin here is thinner and stretches more over tendons. A simple phrase like “dorsal swelling on the ulnar side” tells a clear story: puffiness on the back of the hand by the little finger edge.

Landmarks You’ll Hear In Clinics And Gyms

Thenar Eminence

This is the fleshy mound below the thumb on the palm. It houses short muscles that move the thumb for pinches and snaps. Extra phone scrolling and tight gaming grips can tire this area fast.

Hypothenar Eminence

This is the fleshy mound below the little finger on the palm. It helps with cupping the palm and controlling the small finger. People feel pressure here when they lean on a desk edge or press the “karate-chop” border into a surface.

How To Describe A Spot Like A Pro

Use this stack: side + surface + landmark + distance. An example line for notes would be: “Tender 2 cm distal to the wrist crease on the ulnar side, palmar surface, over the hypothenar.” That single sentence helps a clinician or therapist find the same spot later and compare progress.

Common Phrases People Use—And What They Mean

Everyday talk mixes up edges and surfaces. Below is a short decoder for the phrases people use at home, at the gym, or in a clinic.

Everyday Phrase	Precise Term	Context
Thumb side of the hand	Radial side	Pain by the thumb, watch strap pressure, bracing
Pinkie side of the hand	Ulnar side	Mouse use, ulnar wrist ache, desk edge pressure
Palm side	Palmar surface	Calluses, tape, grip cream, splint contact
Back of the hand	Dorsal surface	Knuckle bumps, ring squeeze, back-hand scrapes
Meaty thumb pad	Thenar eminence	Thumb strain, texting soreness, pinch drills
Meaty pinkie pad	Hypothenar eminence	Desk-edge pressure, ulnar nerve talk, tool grip

Handedness Doesn’t Change The Names

Right-handed or left-handed doesn’t matter. Radial is always the thumb side. Ulnar is always the little finger side. Palmar is palm. Dorsal is back. That fixed map keeps notes consistent between people, hands, and positions.

Where “Side Of The Hand” Comes Up In Real Life

Sports And Training

Bar work, kettlebell cleans, and long rows stress skin and tendons near the palm. Calluses form on the palmar surface under the fingers, more toward the radial side for many grips. Wrist wraps change pressure on the dorsal surface near the thumb edge. Simple wording like “radial dorsal ache after cleans” guides tweaks to grip, load, or straps.

Typing And Desk Setups

Leaning your ulnar border on a hard edge can spark a pinch feeling. Try moving the pad under the forearm so the contact spreads. A slight keyboard angle can shift load away from the hypothenar mound. Small changes add up over long workdays.

DIY, Yard Work, And Tools

Hammers, pruners, and screwdrivers all bias one side of the hand. A thick handle spreads load across the palmar surface and trims hot spots on the thenar pad. Gloves with a soft ulnar border ease desk-edge and tool-edge contact for people who rest that side during tasks.

Martial Arts And Contact Sports

The “chop” edge is the ulnar side. Strike drills and blocks put repeat stress there. Padding and rest make a difference, but wording in a training log matters too. Note which side and which surface felt sore so patterns show up across weeks.

How Clinicians Use These Terms

During an exam, a clinician will note which edge and surface show symptoms, then test range and strength. They may press the thenar and hypothenar mounds, compare grip on each side, and look for swelling on the dorsal surface. Clear wording lets follow-ups track change no matter who reads the chart.

Thumb-Side Vs Pinkie-Side Wrist Pain

Pain by the thumb edge often links to tendons that cross the radial side of the wrist. Pinkie-side aches can tie to the triangular fibrocartilage complex and ulnar carpal contacts. Exact causes vary, so the labels don’t diagnose on their own. The labels just point to a zone so signs can be tested with the right movements.

Close Variation: What To Call The Side Of The Hand In Medical Terms

You’ll sound clear and accurate with a short formula: radial or ulnar for side, palmar or dorsal for surface, plus a landmark when needed. Add finger or wrist distance when you can. A single line like “dull ache, dorsal radial, 1 cm proximal to the wrist crease” beats vague notes every time.

How This Ties Back To Forearm Bones

The names stay anchored to bone layout even when the forearm rotates. During pronation and supination, the radius crosses the ulna, but the thumb stays the radial side and the little finger stays the ulnar side. That bone rule keeps side labels stable whether you’re pouring coffee or turning a doorknob.

Simple At-Home Checks To Learn The Map

Two-Finger Wrist Line

Place two fingers across the wrist crease. Wiggle the thumb. Feel tendon motion along the radial side. Now wiggle the little finger and feel motion toward the ulnar side. That quick scan teaches the two edges.

Grip And Release Drill

Make a fist and squeeze. The thenar mound firms up. Open wide and spread the fingers. The dorsal tendons stand out. Note which spots light up with each move and name them with side plus surface.

Desk Pressure Check

Rest the edge of your palm on the desk. If pressure sits on the pinkie-side pad, that’s the hypothenar area on the ulnar, palmar side. If you tip toward the thumb pad, that’s the thenar area on the radial, palmar side. Adjust posture or padding so contact feels even.

When To Use Landmarks Like Thenar And Hypothenar

Landmarks add clarity when a spot is small or a muscle group is involved. “Thenar soreness” points to the thumb-side mound on the palm and can steer someone toward rest from hard pinches. “Hypothenar tenderness” flags the pinkie-side mound and can explain pain when leaning that edge on a laptop or countertop.

Hand Size Gear Tips Using The Right Terms

Gloves

Fit checks go faster when you name the side. If the seam rubs the thumb edge, say the rub is on the radial side. If padding bunches by the small-finger edge, say it’s on the ulnar side. Asking for “more palmar cushion near the hypothenar” gets you the right fix.

Braces And Wraps

A wrist brace might press more on one edge. If a strap digs near the thumb, ask for a shape with a softer radial border. If a rigid stay presses by the pinkie edge, ask for a model with more give on the ulnar side or add a small gel pad on that border.

Clear Phrases You Can Copy Into Notes

• “Sharp ache, palmar ulnar, just distal to the wrist crease.”
• “Bruise, dorsal radial, mid-hand near second metacarpal.”
• “Tingling at the hypothenar on the palmar ulnar side after long typing.”
• “Soreness over thenar after pinch drills; rest and ice helped.”

Trusted Definitions In One Place

If you want a deeper dive into the bone names that drive these labels, see the ulna page from a major medical center and this overview of radius and ulna anatomy. For palm landmarks, clinical texts group the thumb pad as the thenar eminence and the pinkie pad as the hypothenar eminence.

Mini Glossary

Radial

Toward the thumb side. Also used for motions like radial deviation.

Ulnar

Toward the little finger side. Also used for motions like ulnar deviation.

Palmar

Palm side. Skin here is thick and anchored for grip.

Dorsal

Back of the hand. Skin here is thinner and glides over tendons.

Thenar Eminence

Thumb-side palm mound. Short thumb movers live here.

Hypothenar Eminence

Pinkie-side palm mound. Small-finger movers live here.

Mistakes To Avoid When Naming A Side

Don’t flip the map when your palm faces down. Radial still means thumb side, ulnar still means little finger side. Don’t blend surface with side; “palm of the hand” is palmar surface, not the “radial palm” unless you mean the thumb-edge of the palm. Don’t leave out surface or side in a report if both matter.

Short Scenarios With Correct Wording

Skinned Knuckles

“Abrasion on the dorsal surface, radial side, over index metacarpal.” That line tells a clear site and helps match photos or chart drawings later.

Phone Hand Numbness

“Numb patch on the palmar radial side across the thenar area.” That points to the thumb-side palm mound and steers tests toward thumb movers and median nerve territory.

Karate-Chop Bruise

“Bruise along the ulnar border, palmar side, near the hypothenar.” That phrase sets the scene for pads, taping, or rest ideas that unload the pinkie-side palm mound.

Why This Language Helps Care And Recovery

Clear terms cut delays. If you message a clinic with “sharp ulnar wrist pain after rowing,” staff know where to start and which motions to test. If your training log says “dorsal radial ache during front rack holds,” a coach knows the slot to fix and the warm-up to pick.

Two Quick Memory Hooks

R For Radius, R For Thumb-Side Watch

Many watches sit near the thumb edge of the wrist. “R” for radius lines up with “R” for that watch side.

U For Ulna, U For “Ulnar Chop”

The martial-arts chop edge is the pinkie side. Tag that edge “ulnar” and the name sticks.

Where The Keyword Fits In Real Searches

People type what is the side of your hand called? during first-aid searches, glove shopping, or form checks. They want a crisp label to point at a zone. Now you’ve got the map and the words to say it right.

Key Takeaways: What Is The Side Of Your Hand Called?

➤ Thumb edge is the radial side.

➤ Pinkie edge is the ulnar side.

➤ Palm is palmar; back is dorsal.

➤ Thenar = thumb pad; hypothenar = pinkie pad.

➤ Use side + surface + landmark.

Frequently Asked Questions

Is The Thumb Side Always Called The Radial Side?

Yes. The thumb aligns with the radius bone, so that edge is radial in any forearm rotation. Palm up or palm down doesn’t change the label. That fixed rule keeps notes consistent across positions and motions.

What’s The Correct Term For The Chop Edge Of The Hand?

That’s the ulnar side. Add a surface to be exact. If the sore spot is on the palm, say palmar ulnar. If it’s on the back of the hand, say dorsal ulnar. That extra word speeds up care and training tweaks.

How Do I Describe Pain Near The Thumb Pad?

Say “thenar soreness” and add side and surface: palmar radial over the thenar eminence. This points to the thumb-side palm mound and helps a clinician pick the right tests for thumb movers and nearby nerves.

Which Words Should I Use For Wrist Pain By The Pinkie?

Try “ulnar-sided wrist pain.” Add surface if it matters, like palmar or dorsal. Those small additions guide brace fit, activity changes, and which motions to recheck at follow-up.

Do These Terms Change For Kids Or Smaller Hands?

No. The map is the same from kids to adults. Radial stays thumb side; ulnar stays little finger side. Use landmarks like thenar or hypothenar when a smaller hand makes distances short and spots tight.

Wrapping It Up – What Is The Side Of Your Hand Called?

Use four anchors and you’ll always be clear: radial for the thumb edge, ulnar for the little finger edge, palmar for the palm, dorsal for the back. Layer in thenar or hypothenar when the palm mounds matter. If you need to be precise, add a short distance from a crease or bony point. That’s all it takes to turn “it hurts on the side” into a clean, useful note.