The rubbery disks that lie between the bones in the spine have a soft center, called a nucleus. The nucleus is surrounded by a tougher exterior, called the annulus. A herniated disk happens when part of the soft center pushes out through a tear in the tough outer layer. If the herniated disk presses on a nerve, it may cause symptoms.
Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.
Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press.
Mayo Clinic researchers drive discoveries that improve detection, diagnosis and treatment. Your quick message to them means so much.