Scoliosis is fairly common: about 2% to 3% of people in the United States are estimated to have it, or roughly 6 to 9 million people. It most often starts in children and teens around ages 10 to 15, and many mild cases never cause symptoms or need treatment.

Quick scoop

  • Most cases are idiopathic , meaning the cause is unknown, and that accounts for about 80% to 90% of cases.
  • Mild scoliosis is often found incidentally during routine checkups or school screening.
  • Only a smaller share need treatment like bracing or surgery.

What that means

For most people, scoliosis is a manageable condition rather than a severe one. The main reason it matters is that curves can sometimes worsen during growth spurts, so catching it early helps.

Signs to watch for

  • Uneven shoulders or hips.
  • One shoulder blade sticking out more.
  • Clothing hanging unevenly.
  • A rib hump or visible curve when bending forward.

TL;DR

Scoliosis is common, usually mild, and often first appears in adolescence; in the U.S., roughly 2% to 3% of people are estimated to have it.