A bulging disc injury is a common spine injury sustained to your spine's intervertebral disc. It can occur in your lumbar spine (lower back), thoracic spine (upper and mid-back) or your cervical spine (neck).
A bulging disc can commonly be referred to as a slipped disc or a protruding disc. However, when the disc bulge is significant enough for the disc nucleus to come out of the annulus, it is known as a herniated disc. See diagram.