Scoliosis is a lateral curvature of the spine, meaning the spine does not look straight when looking at it from behind. The shoulders may appear uneven and one side of the rib cage may protrude. The most common type of scoliosis is adolescent idiopathic scoliosis which has no known cause and is usually diagnosed between the ages of 10 and 15 years. Twenty percent of people who have relatives with scoliosis will develop scoliosis. During the teenage years, mild to moderate scoliosis can be helped with regular osteopathic treatment.