Idiopathic Scoliosis: Symptoms, Causes, and Modern Treatment Options
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 17, 2026
Quick Answer
Idiopathic scoliosis is a side-to-side curve of the spine with an unknown cause, often shaped like a C or S. It is the most common childhood spinal abnormality and is usually found between ages 10 and 15. It isn't usually painful. Treatment depends on curve size: mild cases need only observation, while others need a brace or surgery. [1]
What the research says
Bracing lowers the chance of a curve reaching surgery range. In the BrAIST trial of 242 adolescents with high-risk curves (116 randomized to bracing or observation and 126 who chose), treatment success was 72% with bracing versus 48% with observation (propensity-score-adjusted odds ratio 1.93, 95% CI 1.08 to 3.46). Among randomized patients, success was 75% versus 42% (odds ratio 4.11, 95% CI 1.85 to 9.16). The trial was stopped early because bracing worked, and more hours of brace wear were linked to higher success. (Weinstein et al., N Engl J Med, 2013)
The wider bracing evidence agrees, but its quality is low. A Cochrane systematic review of 7 studies (662 participants) found that all the included papers consistently showed bracing prevented curve progression. However, the evidence was low to very low quality, and the authors noted how hard it is to run randomized trials when parents reject randomization of their children. (Negrini et al., Cochrane Database Syst Rev, 2015)
Evidence for exercise-based treatment is still thin. A Cochrane review of 13 randomized trials (583 participants) concluded that evidence on therapeutic exercises is sparse because of small studies, differences between trials and many different comparisons. The review was very uncertain whether exercises reduce the Cobb angle compared with no treatment (mean difference −3.6°, 95% CI −5.6 to −1.7; 2 studies, 52 participants). (Romano et al., Cochrane Database Syst Rev, 2024)
What is idiopathic scoliosis?
Idiopathic scoliosis is a sideways spine curvature with an unknown cause, and the word idiopathic simply means that healthcare providers don't know the cause. Your spine may look like the letters C or S. It is the most common type of scoliosis, and children most often receive this diagnosis after a growth spurt in adolescence. [1]
Scoliosis isn't usually painful, so a child might not even notice it. It won't prevent them from playing, participating in sports or doing other childhood activities, which is why a note from an in-school screening can come as a surprise to parents. The size of the curve varies from person to person. Mild cases may not need treatment, while severe ones might require surgery. [1]
Scoliosis curves most commonly occur in the upper and middle back (thoracic spine), but they can also develop in the lower back (lumbar spine). Both boys and girls can be affected, but girls are more likely to develop larger curves that need medical care. [2]
Signs and symptoms
For many children, idiopathic scoliosis shows up as a change in posture or alignment rather than pain. These signs might not be noticeable until a growth spurt, usually during puberty. [1]
Because teenagers are often self-conscious and avoid form-fitting clothes, many cases are first noticed during a school screening or a regular pediatric checkup. [2]
Symptoms are rare and can happen with severe curves. They include back pain or discomfort, numbness in the arms and legs, and muscle weakness. [1]
Causes and risk factors
Healthcare providers don't know the exact cause of idiopathic scoliosis. Research suggests it may result from genetics or environmental factors. [1] You're more likely to develop it if a biological parent or sibling has the condition, and about 30% of patients with adolescent idiopathic scoliosis have a family history. [1] [2]
It is not related to specific behaviors or activities, such as carrying a heavy backpack or having poor posture. [2]
Complications of severe, untreated curves
Complications happen with severe, untreated curves. [1]
Severe back pain
Nerve damage and lumbar radiculopathy
Shortness of breath (respiratory problems), because severe curves can eventually affect lung function
Heart problems, such as mitral valve prolapse
Idiopathic scoliosis can also affect a child's self-esteem because they may feel they look different from other kids their age. Talking with a mental health professional can help. [1]
How idiopathic scoliosis is diagnosed
A diagnosis usually follows a scoliosis screening done by a primary care physician or a school nurse. The provider looks at the child's back (with the shirt removed) to check posture, alignment and possible spine curves, and may ask the child to stand up straight and bend forward. [1]
The standard screening test is the Adam's forward bend test. The child bends forward with feet together, knees straight and arms hanging free, and the doctor looks from behind for a difference in the shape of the ribs on each side. The doctor also checks that the hips and shoulders are level and that the head is centered over the hips. [2]
If scoliosis is suspected, an X-ray shows the bones of the spine, the exact location of the curve and how severe it is. [1] [2] Scoliosis can also be diagnosed in adults, because mild cases are sometimes missed in childhood and can progress with age. [1]
Treatment options
Treatment depends on the curve's severity, its location, the child's age and how much growing remains. [1] [2]
Curve size | Typical approach | Notes |
Under 25° (or nearly fully grown) | Observation | Recheck about every 6 to 12 months, with follow-up X-rays until fully grown. [2] |
About 25° to 45° while still growing | Bracing | |
Above about 40° to 50°, or bracing failed | Surgery |
These numbers are guides, not rules. The care team also weighs the curve's location and progression and whether the child is fully grown. [1] [2]
Observation
Mild curves often need only regular checkups with a physician to make sure the curve isn't getting worse. [1]
Bracing
A brace is worn to stop the curve from getting worse as a child grows. It won't straighten the curve, but it may reduce the need for surgery. [1] [2] There are several types, and most are underarm braces made to fit the child's body. A provider chooses the type that fits the child and their activity level and tells you how long it must be worn each day. For example, your child may be able to take it off to shower, play sports and sleep. [1] [2]
Surgery
Surgery helps stabilize the spine and reduce the severity of the curve, and it can prevent complications such as respiratory problems. [1] The most common operation is spinal fusion: the surgeon straightens or realigns the curve and then fuses spinal bones together so they heal into one solid bone, which stops growth in that part of the spine. [1] [2] Depending on the child's age, a fusion can affect overall height, and surgeons take this into account. [1]
If a child has a severe curve and is still growing, they may be a candidate for growth-modulating surgery, which uses the child's remaining growth to let the spine grow straighter while avoiding fusion and keeping the spine mobile. [1] However, AAOS notes that more follow-up is needed to determine how useful these tethering procedures are, so spinal fusion is still considered the gold standard. [2]
Recovery after spinal fusion
Patients are usually discharged 3 to 4 days after surgery, and most children can return to school and daily activities within 4 weeks. Most can return to sports within 6 to 9 months, although contact sports such as football may be discouraged because surgery permanently limits some spine movements. [2]
Outlook
Idiopathic scoliosis is progressive, which means the curve may get worse as a child gets older. For example, a curve of 30 to 50 degrees may increase by 10 to 15 degrees over a person's lifetime, and curves over 50 degrees may increase by about 1 degree per year. [1]
A provider measures the curve at regular checkups and says whether a brace or surgery is needed. Many children don't need surgery right away. Idiopathic scoliosis doesn't go away on its own, but treatment can stabilize the spine, correct the curve or prevent it from getting worse. [1]
Can it be prevented?
You can't prevent idiopathic scoliosis because the cause is unknown. A provider may suggest a brace to keep the curve from getting worse. [1]
When to see a healthcare provider
See a healthcare provider if you notice signs of scoliosis in your child. They will do a screening and order imaging tests, or confirm the results of an in-school screening. [1] If your child already has a diagnosis, tell their provider if they have pain or discomfort, if symptoms get worse instead of better with treatment, or if they have shortness of breath or other complications. [1]
Frequently Asked Questions
Can idiopathic scoliosis be prevented?
No. The cause is unknown, so it can't be prevented. A provider may suggest a brace to keep an existing curve from getting worse.
Does a heavy backpack cause scoliosis?
No. Idiopathic scoliosis isn't related to specific behaviors or activities such as carrying a heavy backpack or having poor posture.
Will my child have to stop playing sports?
Usually not. Scoliosis won't prevent children from playing sports or doing other childhood activities, and a child can typically take off the brace for sports.
How long does a child need to wear a brace?
A provider decides how long the brace is worn each day and for how long overall. In the BrAIST trial, patients were told to wear the brace at least 18 hours a day, and more hours of wear were linked to better results.
Is scoliosis surgery safe?
Spinal fusion is very successful at stopping the curve from growing and significantly straightens it. As with any major surgery there are risks, which your surgeon will review with you.
Can adults be diagnosed with idiopathic scoliosis?
Yes. Scoliosis can progress with age, and mild cases are sometimes missed in childhood, so signs may show up in adulthood.
Does scoliosis always cause a visible hump?
Rib prominence is a common sign, and a spinal deformity is most noticeable when the child bends forward. It may be less obvious when standing straight.
Is back pain common with scoliosis?
No. Idiopathic scoliosis isn't usually painful. Back pain, numbness and muscle weakness are rare and can occur with severe curves.
Can exercise or physical therapy treat scoliosis?
The evidence is limited. A Cochrane review found that evidence on therapeutic exercises is sparse. Observation, bracing and surgery are the standard treatments, so ask your provider whether exercises can be added.
What happens if a moderate curve isn't treated?
Idiopathic scoliosis is progressive, so the curve can worsen as a child grows. Severe, untreated curves can lead to complications such as breathing problems and heart problems.
Are there different types of braces?
Yes. There are several types, and most are underarm braces made to fit the child's body. The provider chooses one based on the child and their activity level.
How often should a child with a mild curve see the doctor?
When a curve is being observed, doctors typically recheck about every 6 to 12 months and schedule follow-up X-rays until the child is fully grown.
Does scoliosis affect height?
Spinal fusion stops growth in the fused part of the spine, so in a child who is still growing it can affect overall height. Your child's provider takes this into account when planning surgery.
Is scoliosis more common in girls or boys?
Both boys and girls can be affected, but girls are more likely to develop larger curves that need medical care.
Can scoliosis be diagnosed without an X-ray?
A screening exam can raise suspicion, but an X-ray is used to see the bones of the spine and measure how severe the curve is.
Does idiopathic scoliosis go away on its own?
No. It doesn't go away on its own, but treatment can stabilize the spine, correct the curve or prevent it from getting worse.
Related Reading
Scoliometer: How It Screens for Scoliosis and What Readings Mean explains the handheld tool used to screen for scoliosis.
References
Cleveland Clinic. Idiopathic Scoliosis. Cleveland Clinic. Last updated July 23, 2024. https://my.clevelandclinic.org/health/diseases/idiopathic-scoliosis
American Academy of Orthopaedic Surgeons. Idiopathic Scoliosis in Children and Adolescents. OrthoInfo. Accessed October 15, 2026. https://www.orthoinfo.org/diseases--conditions/idiopathic-scoliosis-in-children-and-adolescents
Weinstein SL, et al. Effects of bracing in adolescents with idiopathic scoliosis. N Engl J Med. 2013;369(16):1512-1521. PMID 24047455. https://doi.org/10.1056/NEJMoa1307337
Negrini S, et al. Braces for idiopathic scoliosis in adolescents. Cochrane Database Syst Rev. 2015;2015(6):CD006850. PMID 26086959. https://doi.org/10.1002/14651858.CD006850.pub3
Romano M, et al. Therapeutic exercises for idiopathic scoliosis in adolescents. Cochrane Database Syst Rev. 2024;2(2):CD007837. PMID 38415871. https://doi.org/10.1002/14651858.CD007837.pub3
Medical disclaimer
This article is for general educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. If you think you may have a medical emergency, call your doctor or 911 immediately.
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