[header] How to diagnose adult scoliosis [title] Look for uneven shoulders. [step] There are several physical signs that may indicate the presence of scoliosis. Because most cases of scoliosis affect the mid-to-upper back (called the thoracic spine), uneven shoulder levels is a common sign. 
Look in the mirror with your shirt off, relax your arms, and see if your shoulders are uneven. [substeps] " humping " of shoulders blades (one that sticks out more) is also common with thoracic scoliosis.