SymptomBones, joints & muscles
Signs of Scoliosis: How to Spot a Curved Spine
Scoliosis shows up as a sideways curve of the spine, and its signs are often subtle: one shoulder or shoulder blade higher than the other, a waist that looks uneven, one hip sticking out, or a hump on one side of the back when bending forward. It usually appears in children aged 10 to 15 during growth spurts and is rarely painful at first. A simple forward-bend check can spot it, and early diagnosis lets doctors monitor or brace a curve before it worsens.
Also called: Curved spine, spinal curvature, lateral curvature of the spine, S-curve spine
At a glance
- What it looks like
- Uneven shoulders, shoulder blades or hips, a tilted waist, a rib hump on bending forward.
- When it appears
- Most often at 10 to 15 years, during the growth spurt before and around puberty.
- Pain?
- Usually painless in children. Back pain is more common in adult scoliosis.
- How to check
- The forward bend test at home, confirmed by a doctor and an X-ray.
- Next step
- Mild curves are watched; larger curves in growing children are braced or, rarely, operated on.
When to get help
See a doctor within a day or two
- A curved spine with new leg weakness, numbness or problems controlling the bladder or bowels
- Back pain in a child that wakes them at night, or comes with fever or weight loss
- A rapidly worsening curve in an adult, with breathlessness
Book a routine appointment
- One shoulder, shoulder blade or hip visibly higher than the other
- A rib or lower back hump on one side when bending forward
- Clothes hanging unevenly, or hemlines that are uneven
- A family history of scoliosis in a child entering puberty
- A curve in a child with a neuromuscular condition, or signs of Marfan syndrome
Signs of scoliosis to look for
Many curves are first noticed by a parent, a sports coach or a school nurse, often when the child is in a swimsuit. Look for:
- Uneven shoulders: one higher than the other
- A prominent shoulder blade on one side
- Uneven waist: a deeper crease on one side, or the arm hanging farther from the body on one side
- One hip higher or sticking out more
- The head not centered over the pelvis
- A rib hump: ribs on one side sticking out when bending forward
- Leaning to one side
- Clothes not fitting evenly
In adults, signs include losing height, back pain, leg pain or numbness from nerve pressure, and visible changes in posture.
How to check for scoliosis at home: the forward bend test
- Have the child stand with their back to you, shirt off, feet together and knees straight.
- Ask them to bend forward at the waist with arms hanging down, palms together, as if diving.
- Look along the back from behind, at eye level with the spine.
- Check whether one side of the ribs or lower back is higher than the other.
A hump on one side suggests the spine is twisted, which happens in structural scoliosis. This test is a screen, not a diagnosis. Any asymmetry should be checked by a doctor.
What can look like scoliosis
| Finding | What it may be |
|---|---|
| Curve that disappears when bending forward or sitting | Functional curve from a leg length difference or muscle spasm |
| Rounded upper back, not sideways | Kyphosis or poor posture |
| Slouching that corrects when standing tall | Postural problems |
| Fixed curve with a rib hump | Structural scoliosis |
Causes of a curved spine
Most scoliosis in children is idiopathic, meaning no single cause is found. It runs in families and is more likely to progress in girls. Other types:
- Congenital: spine bones form abnormally before birth.
- Neuromuscular: from conditions affecting muscles and nerves, such as cerebral palsy, muscular dystrophy and spina bifida.
- Syndromic: linked to Marfan syndrome, Ehlers-Danlos syndrome or neurofibromatosis.
- Degenerative: in adults over 50, from wear of discs and joints.
Heavy backpacks, sports, sleeping position and poor posture do not cause scoliosis.
When scoliosis needs a doctor
See a doctor for any visible asymmetry. A child's curve can progress quickly during growth spurts, so early assessment matters. Red flags that point to an underlying cause:
- pain, especially at night
- a left-sided thoracic curve (unusual in idiopathic scoliosis)
- numbness, weakness, abnormal reflexes or bladder problems
- rapid progression
- onset before age 10
How scoliosis is diagnosed
The doctor will examine the back, perform the forward bend test, often measure the rib hump with a scoliometer, check leg lengths and do a neurological exam. A standing X-ray of the whole spine confirms the diagnosis and measures the curve in degrees (the Cobb angle). A curve of 10 degrees or more is scoliosis. The X-ray also shows how much growth remains. An MRI is done if red flags are present.
The detailed scoliosis condition page explains types, measurement, bracing and surgery.
What happens next
- Under 20 to 25 degrees: observation with check-ups and X-rays every 4 to 12 months during growth.
- 25 to 40 degrees in a growing child: a brace worn 13 to 20 or more hours a day to stop progression.
- Over 45 to 50 degrees: surgery may be recommended.
- Exercise programs such as scoliosis-specific physical therapy can help posture and core strength.
Frequently asked questions
What are the first signs of scoliosis?
The first signs are often uneven shoulders, one shoulder blade sticking out, an uneven waist, or one hip higher than the other. A hump on one side of the back when bending forward is a key sign. Children rarely have pain.
How can I check my child for scoliosis?
Use the forward bend test: with their back bare, have your child bend forward with arms hanging and look along the back from behind. If one side of the ribs or lower back is higher, see a doctor for an examination and possibly an X-ray.
Does scoliosis cause back pain?
Mild scoliosis in children is usually painless. Adults with scoliosis, especially degenerative scoliosis, more often have back pain and sometimes leg pain. A child with significant back pain should be checked for other causes.
At what age does scoliosis start?
The most common type, adolescent idiopathic scoliosis, appears between 10 and 15 years, during the growth spurt. Scoliosis can also be present from birth, develop in early childhood, or appear in adults over 50 as the spine wears.
Sources
This guide was written from current patient and clinical guidance, including:
- Scoliosis Research Society: Scoliosis (patient information)
- American Academy of Orthopaedic Surgeons (OrthoInfo): Idiopathic scoliosis in children and adolescents
- NIAMS (National Institute of Arthritis and Musculoskeletal and Skin Diseases): Scoliosis
- NHS: Scoliosis
- Pediatric Orthopaedic Society of North America: Scoliosis