Scoliosis denotes lateral curvature of the spine. The percentage of having scoliosis is higher in the group of children and teenager. The problem is most likely due to muscle imbalance along the spine and bony abnormality of the spinal column.
It was proved that poor posture does not lead to Scoliosis, but a poor posture does definitely make secondary problems, like back and knee pain worse!
In children, spinal deformity is usually the only symptom. Pain is usually a feature in adults with long-standing deformity.