Scoliosis is where the spine twists and curves to the side.
It can affect people of any age, from babies to adults, but most often starts in children aged 10 to 15.
Scoliosis doesn't normally improve without treatment, but it isn't usually a sign of anything serious and treatment isn't always needed if it's mild.
Signs of scoliosis include:
Some people with scoliosis may also have back pain. This tends to be more common in adults with the condition.
See your GP if you think you or your child has scoliosis. It's unlikely that there's anything seriously wrong, but it's best to get checked out.
Your GP will examine your back and can refer you to a hospital doctor for help with diagnosis if they suspect scoliosis.
An X-ray of your back will be carried out in hospital to check whether your spine is curved and how severe the curve is.
If you're diagnosed with scoliosis, you should see a specialist to discuss treatment options.
Treatment for scoliosis depends on your age, how severe the curve is, and whether it's likely to get worse with time.
Many people won't need any treatment and only a small number will need to have surgery on their spine.
It's not clear whether back exercises help improve scoliosis, but general exercise is good for overall health and shouldn't be avoided unless advised by your doctor.
Most people with scoliosis are able to live normal lives and can do most activities, including exercise and sports.
The condition doesn't usually cause significant pain or any other health problems, and tends to stay the same after you stop growing – see your GP if it gets any worse.
Having scoliosis or wearing a back brace can be tough and may cause problems with body image and self-esteem, particularly for children and teenagers.
You may find it useful to contact a support group, such as Scoliosis Association UK.
These groups are a good source of information and support, and they may be able to put you in touch with other people in a similar situation to you.
In around 8 in every 10 cases, the cause of scoliosis is unknown. This is called idiopathic scoliosis.
Idiopathic scoliosis can't be prevented and isn't thought to be linked to things such as bad posture, exercise or diet.
Your genes may make you more likely to get it, though, as it sometimes runs in families.
Less commonly, scoliosis may be caused by:
Scoliosis Association UK has more information about the different types of scoliosis.