The disc is a soft pulpy "shock absorber".  It has a fibrous outer ring which holds in a jelly-like material.  A "slipped disc" is a common way to refer to a wide variety of disc problems.  However, a disc can't slip because of the way it attaches to the spinal bones above and below it.  A disc can bulge.  It can protrude.  It can extrude/herniate.  But it can't slip. 

Disc problems are best seen via an MRI scan.  One who has a disc protrusion or extrusion can experience radiating pain, numbness/tingling and or weakness in the extremities.  Chiropractic is a safe and conservative approach to caring for discs in the above mentioned conditions, however, in some instances a neurosurgical consult may be warranted.