How can the Disc be injured?

Other than through an accident, the major cause is bad posture and lack of knowledge of how to walk, run, lift, carry, push, pull, lie, stand and so on. The disc can tear, in which case the jelly-like substance will flow out and cause the common condition known as a “slipped disc”, although the disc has not actually slipped at all.
Tears within the ligament rings are called “herniated discs” and tears through the ligament rings are called “ruptured discs”.