A small difference is normal
Only about 1 in 5 healthy teenagers had level shoulders in one study, and X-rays and photos of teenagers and young adults show that small differences are the norm.
Posture guide
Uneven shoulders: why one shoulder is higher, and when to get it checked
Few people have perfectly level shoulders. In a study of healthy teenagers who all thought their shoulders were level, only about 1 in 5 actually were, and small differences are just as usual in adults. Which hand you use, the sport you play and how you happen to be standing all play a part.
Sometimes uneven shoulders are worth a check: in a child or teenager they can be a sign of scoliosis, and a shoulder that starts to droop can be a nerve problem. We found no study showing that a small difference causes neck or back pain.
This guide covers how common uneven shoulders are, the causes, when to see a GP and what exercise can and can't do, with moves for the upper back and trunk that train both sides.
15 moves15 with 3D demosIs it normal?CausesScoliosis signsWhen to see a GPWhat exercise can doExercises
The short version
Handedness, sport and habit
Which hand you use and the sport you play shape how your shoulder blades sit and move, and these differences are common in people without any pain.
When it can be scoliosis
In a child or teenager, uneven shoulders together with a shoulder blade or hip that sticks out, ribs that stick out on one side or clothes that hang unevenly can be scoliosis. The NHS says it's unlikely to be anything serious, but it's best to get it checked.
Not a known cause of pain
We found no study showing that a small difference in shoulder height causes neck or back pain, and reviews find no agreed link between posture and back pain.
Source 9
What exercise can do
Exercise builds strength, movement and comfort around the shoulders and trunk. No trial in adults shows that it levels the shoulders, and the evidence in children is weak.
How common uneven shoulders are
Level shoulders are unusualEmerging evidence
In 91 healthy teenagers aged 10 to 18 who all said their shoulders were level, only 17 (19%) had level shoulders in photos, and the average difference in height was 7.5 mm. The authors wrote: "Contrary to popular belief, shoulder balance in healthy adolescents often does not exist."
Source 1
X-rays and photos agreeEmerging evidence
On X-rays of 273 adolescents, the shoulders were balanced on average, but each person's differed by about 0.9 cm. In photos of 115 young adults, small tilts of the head, shoulders and pelvis were the norm.
One photo isn't the whole story
In a school study, the share of children counted as having uneven shoulders (a difference of more than 1 cm in a photo) rose from 32% to 49% in one school over a single term. The authors suggested growth and more time sitting; to us, it also shows how much a single photo or mirror check can vary.
Source 10
What makes one shoulder higher
Which hand you useEmerging evidence
In 8,245 school children aged 6 to 18, mild asymmetry of the upper back went with handedness, and in 254 girls with scoliosis the curve bulged towards the side of the dominant hand in 82%. In 32 healthy men, the dominant arm predicted how level the shoulder blades sat. Which shoulder sits lower isn't consistent enough to make a rule.
SportEmerging evidence
In healthy overhead athletes, the shoulder blade on the throwing or hitting side sat more turned in and tipped forward at rest, and the authors said this may be normal. Shoulder blades that move unevenly (scapular dyskinesis) were found in 61% of overhead athletes and 33% of other athletes in a review of 1,401, and in 13 of 20 junior tennis players whose shoulders were otherwise healthy and working well.
A shoulder blade problem
A weak serratus anterior muscle, usually from an injured long thoracic nerve, makes the inner edge of the shoulder blade stick out (winging); most of these nerve injuries recover within 1 to 24 months. An injured nerve to the trapezius, often after surgery in the neck such as a lymph node biopsy, makes the shoulder droop and lifting the arm out to the side hard. Sprengel deformity, a high shoulder blade from birth, is rare, and milder cases keep good movement without surgery.
A leg length difference or a tilted pelvis
A tilted pelvis tilts everything above it, and most people's legs differ slightly in length. The Scoliosis Research Society explains that a curve from standing with one knee bent and the pelvis tilted disappears when the pelvis is levelled. The lateral pelvic tilt guide covers this.
After an injury
A shoulder that has changed shape after a fall or injury can be a broken or dislocated bone, and needs an urgent GP appointment or help from NHS 111.
Source 18
Uneven shoulders and scoliosis
The signsStrong evidence
Scoliosis is a sideways curve of the spine. It most often starts between 10 and 15, and about 8 in 10 cases have no known cause. The signs include uneven shoulders, a shoulder blade or hip that sticks out, ribs that stick out on one side, leaning to one side, an uneven waist and clothes that don't fit well. A double curve can look fairly straight.
Posture doesn't cause itStrong evidence
Scoliosis isn't caused by bad posture, heavy bags, exercise or diet.
How it's checkedStrong evidence
A doctor looks at the back as the child bends forward (the Adams forward bend test). In a school programme of 2,700 pupils, the test picked up 84% of curves, and 1.18% of the pupils had scoliosis. An X-ray confirms it: a curve of more than 10 degrees (the Cobb angle) counts as scoliosis.
How many need treatment
About 3 to 4 in every 1,000 children need specialist care for scoliosis. Our scoliosis guide covers checking, bracing, surgery and exercise.
Source 19
When to see a GP
Children and teenagers: see a GP if
Most uneven shoulders are normal, and the NHS says it's unlikely that anything is seriously wrong, but get it checked if one shoulder is higher and you also notice:
- A shoulder blade or hip that sticks out.
- Ribs that stick out on one side, often clearest when your child bends forward.
- Leaning to one side, or an uneven waist.
- Clothes that don't hang evenly.
- A brother, sister or parent with scoliosis: look at your child's back during growth spurts, for example in a swimsuit.
Adults: see a GP if
Get it checked if:
- A shoulder has started to droop, or a shoulder blade has started to stick out, especially with weakness lifting the arm or after an operation in the neck.
- A known curve seems to be getting worse.
- Shoulder pain is getting worse or hasn't improved after 2 weeks, or it's very hard to move your arm or shoulder.
Urgent help
Ask for an urgent GP appointment or get help from NHS 111 if you have sudden or very bad shoulder pain, can't move your arm, your arm or shoulder has changed shape or is badly swollen, you have pins and needles that don't go away or no feeling in the arm or shoulder, it's hot or cold to touch, the pain started after a fall or injury, you have severe pain in both shoulders, or you feel feverish or unwell.
Source 18
What the evidence says
For scoliosis, bracing during growth and, for large curves, surgery carry the evidence; the scoliosis guide covers them.
No link with pain foundEmerging evidence
We found no study that tested whether a small difference in shoulder height causes neck, shoulder or back pain. Across 41 systematic reviews, there was no consensus that spinal posture causes back pain.
Source 9
Exercise and shoulder height in adults
We found no trial showing that exercise changes resting shoulder height in adults without scoliosis. Advice to shrug the low shoulder or stretch the high side hasn't been tested.
A school programme in childrenMixed evidence
In two primary schools in Beijing (1,286 children aged 9 to 11), one school added 16 weeks of functional training to its PE (physical education) lessons, 3 lessons of 40 minutes a week. The share of children with uneven shoulders fell from about 32% to 25% there, while in the other school it rose from 32% to 49% over the same term. The schools weren't randomly assigned, the comparison school's large rise is hard to explain, and there was no long-term follow-up, so this is weak evidence.
Source 10
Shoulder blade exercises in scoliosisEmerging evidence
In 26 teenagers with scoliosis, adding shoulder blade exercises to Schroth exercises, 3 times a week for 8 weeks, evened neck and shoulder blade angles slightly more than Schroth alone, with little effect on the curve itself.
Source 11
Nerve injuries need a specialistStrong evidence
Winging from a weak serratus anterior usually recovers without surgery, within 1 to 24 months, though it persists in about 1 in 4 people. A trapezius nerve injury doesn't reliably recover without treatment, and surgery is often considered. Either needs assessment before you start a programme.
Source 15
What helps
Train both sides
Rows, pull-aparts and shoulder blade raises build the muscles that move and hold the shoulder blades. Train both sides the same: there's no evidence that working one side harder levels the shoulders. These are reasons to train, not a way to change your shape (our editorial view).
The sides of the trunk
Carrying a weight in one hand (a suitcase carry) trains the opposite side of your trunk to stop you leaning, and side planks train the same muscles. If you can't stay level on a carry, the weight is too heavy (editorial).
A stiff neck or upper back
Gentle stretches and turns can ease stiffness: the upper trap release, 2 slow holds of 30 seconds per side, and the levator scapulae stretch, held 20 to 30 seconds, 2 to 4 times each side (the move pages' doses). They're for comfort, not to change shoulder height.
Children
Active, varied play and PE are good for children, with an average of at least 60 minutes of activity a day. There's no need to correct a child's shoulder height; if you notice signs of scoliosis, see a GP.
Source 22
Carry without leaning
The suitcase carry page's caution: if you can't stay level, the weight is too heavy. The distances are our editorial starting point.
- Pick up a light dumbbell, kettlebell or shopping bag in one hand.
- Stand tall with both shoulders level and your free arm relaxed.
- Walk 20 to 30 metres without leaning towards or away from the weight.
- Put it down, swap hands and walk back.
- Do 2 to 3 lengths each side. If you can't stay level, use a lighter weight.
See the movement on the 3D figure: Suitcase carry
Upper back and shoulder blades
Band rows: 3 sets of 10 to 15, stopping 2 to 3 reps short of failure, with 60 to 90 seconds' rest (the move page's dose). Single-arm rows, 3 sets of 8 to 12 each arm; pull-aparts and face pulls, 2 to 3 sets of 12 to 15; Y-T-W raises, 5 of each letter; push-up plus, 2 to 3 sets of 10; wall angels, 8 slow slides (editorial starting points). Train both sides the same.
3D demoBand rowBeginner · A band + An anchor point
3D demoSupported single-arm dumbbell rowIntermediate · A dumbbell + A bench or box
3D demoProne Y-T-W raisesBeginner · No equipment
3D demoBand pull-apartIntermediate · A band
3D demoFace pullIntermediate · A band
3D demoScapular push-up (push-up plus)Beginner · No equipment
3D demoWall angelBeginner · A wallThe sides of the trunk
Carries, 2 to 3 walks of 20 to 30 metres each side; knee side planks, 3 holds of 10 to 20 seconds each side, then side planks, 3 holds of 15 to 30 seconds (editorial starting points).
For a stiff neck and upper back
For stiffness, not to change shoulder height. Upper trap release, 2 slow holds of 30 seconds per side; levator scapulae stretch, 20 to 30 seconds, 2 to 4 times each side; thoracic rotation, 6 rotations per side; open book, 8 to 10 slow openings each side (the move pages' doses).
Workouts to follow
Two or three sessions a week of the upper back or shoulder routine, with a core workout for the trunk. The stretches are for comfort on any day.
Upper back mobility routine
A 12-minute routine for a stiff upper back and rounded shoulders: chin tucks, wall angels, Y-T-W raises and open books.
12 minBeginner8 movesA foam roller, A wall
Shoulder mobility and stability routine (with a band)
A 25-minute band routine for healthy shoulders: move the shoulder and upper back through their range, then strengthen the rotator cuff and shoulder blades.
25 minBeginner12 movesA wall, A band
Neck and shoulder strength routine
Deep neck holds and shoulder-blade strength in under 20 minutes: one of the best-supported kinds of exercise for a stiff, sore neck.
18 minBeginner11 movesA band, An anchor pointNeck and shoulder stretches
Eight gentle neck and shoulder stretches for desk stiffness, done standing or seated in ten minutes.
10 minBeginner8 movesA wall
Beginner core workout
A 15-minute beginner core workout on the floor: dead bugs, bird dogs, knee planks, side planks and curl-ups.
15 minBeginner6 movesNo equipment
Strength and balance workout
Strength and balance in one session: squats, Romanian deadlifts, push-ups, rows, step-ups, back extensions, carries and single-leg balance.
45 minBeginner14 movesA wall, A dumbbellMyths
"One shoulder higher means scoliosis."Emerging evidence
Most healthy teenagers' shoulders aren't level, and about 1 in 100 school children has scoliosis. It's uneven shoulders together with other signs that are the reason to see a GP.
"Uneven shoulders cause neck and back pain."Emerging evidence
We found no study showing this, and reviews find no agreed link between posture and back pain.
Source 9
"Your dominant shoulder is always the lower one."Emerging evidence
Handedness and sport affect how the shoulder blades sit, but not consistently enough to make a rule.
"Heavy bags cause scoliosis."Strong evidence
They don't. We also found no study showing that carrying a bag on one shoulder or sleeping on one side causes a lasting difference in shoulder height.
"Exercises will even out your shoulders."Mixed evidence
No trial in adults shows this. One school study in children is encouraging but weak: two schools, not randomly assigned, with no long-term follow-up.
Source 10
"Shrug the low shoulder to level them."
No study has tested this. Train both sides the same.
Read next
Questions people ask
Is it normal to have one shoulder higher than the other?
Yes. In healthy teenagers who thought their shoulders were level, only about 1 in 5 actually were, with an average difference of 7.5 mm. Small differences are normal in adults too.
Does one shoulder higher than the other mean scoliosis?
Usually not. In a child or teenager it can be a sign, especially with a shoulder blade or hip that sticks out, ribs that stick out when they bend forward, or clothes that hang unevenly; then see a GP.
Why is one of my shoulders lower?
Usually normal variation, which hand you use or the sport you play. Studies don't agree well enough to say the dominant shoulder is always the lower one.
Can uneven shoulders cause neck pain?
We found no study showing that a small difference in shoulder height causes neck or back pain. If your neck hurts, our neck pain guide covers what helps and when to get it checked.
Can you fix uneven shoulders with exercise?
Exercise builds strength, movement and comfort, but no trial in adults has shown that it changes resting shoulder height. One school study in children was encouraging, but it was too weak to be sure.
Can a heavy bag or sleeping on one side cause uneven shoulders?
Heavy bags don't cause scoliosis. We found no study showing that bags or sleeping position cause a lasting difference in shoulder height.
What is a dropped shoulder?
A shoulder that newly droops, especially with trouble lifting the arm out to the side, can come from an injury to the nerve of the trapezius muscle, often after surgery in the neck. See a GP for an assessment.
Why does one shoulder blade stick out?
Shoulder blades often sit or move a little unevenly in healthy people, especially athletes. A shoulder blade that newly sticks out with weakness can be a nerve problem, and in a growing child it can be a sign of scoliosis: see a GP.
Can uneven hips make my shoulders uneven?
Yes. A tilted pelvis tilts the spine and shoulders above it, and a curve that disappears when the pelvis is levelled isn't true scoliosis. Our lateral pelvic tilt guide explains leg length differences.
When should I see a doctor about uneven shoulders?
For a child or teenager with other signs of scoliosis, see a GP. Adults should see a GP for a shoulder that starts to droop or stick out, a curve that seems to be getting worse, or shoulder pain that hasn't improved after 2 weeks.
Sources
- Akel 2008 · Shoulder balance in 91 healthy adolescents (measurement study, Eur Spine J)
- Clement 2020 · Normal spine and shoulder balance on X-rays of adolescents (measurement study, Spine Deform)
- Ferreira 2011 · Posture of young adults measured from photographs (measurement study, J Manipulative Physiol Ther)
- Grivas 2006 · Trunk asymmetry and handedness in 8,245 school children (cross-sectional study, Pediatr Rehabil)
- Oyama 2008 · Asymmetric resting shoulder blade position in healthy overhead athletes (cross-sectional study, J Athl Train)
- Burn 2016 · How common uneven shoulder blade movement (scapular dyskinesis) is in athletes (systematic review, Orthop J Sports Med)
- NHS · Scoliosis (past its review date: reviewed April 2023, review due April 2026)
- Scoliosis Research Society · Diagnosing scoliosis, and screening
- Swain 2020 · No consensus that spine postures cause low back pain (review of systematic reviews, Journal of Biomechanics)
- Zhu 2025 · School functional training, fitness and posture in 1,286 children (two-school comparison, Sci Rep)
- Sarı 2026 · Schroth exercise with or without shoulder blade exercises in adolescent scoliosis (RCT, Physiother Theory Pract)
- Goldberg 1990 · Handedness and the direction of scoliosis curves (cross-sectional study, Spine)
- Aki 2025 · Resting shoulder blade asymmetry in healthy men (cross-sectional study, PLoS One)
- Lee 2026 · Scapular dyskinesis with normal structure and function in junior tennis players (cross-sectional study, BMC Sports Sci Med Rehabil)
- Martin 2008 · Scapular winging: anatomy, diagnosis and treatment (review, Curr Rev Musculoskelet Med)
- Antfang 2025 · Sprengel deformity: conservative treatment versus surgery (cohort study, Orphanet J Rare Dis)
- Knutson 2005 · Leg length inequality: how common, how large and whether it matters (review, Chiropr Osteopat)
- NHS · Shoulder pain (past its review date: reviewed May 2023, review due May 2026)
- Scoliosis Support & Research · What is scoliosis?
- Scoliosis Support & Research · Frequently asked questions
- Karachalios 1999 · How accurate the forward bend test is in school scoliosis screening (10-year follow-up, Spine)
- NHS · Physical activity guidelines for children and young people
Exercise education, not a diagnosis or treatment plan, and clinical review of these guides is pending. Get a curve or hunch that is new or getting worse checked, above all in a growing child or after a fall, and get urgent help for numbness or weakness in the legs or a change in bladder or bowel control. Health disclaimer.