Disc degeneration is an aging process, 

by which lumbar or cervical spine inter-vertebral disc lost its elasticity, and delays the natural healing process. 

hence and undue jerk or constant high pressure over disc leads to internal disc disruption. 

This is the beginning of low back pain with constant spasm and,  off and on excruciating back pain compelling compulsory rest and sickness absenteeism from work place. 

Such episodes are waxing and waning kind of occurrence, that might resolve with rest, medicines and physical therapy initially.

With repeated episodes of back pain with or without leg pain, requires evaluation to identify pain generators via X-ray and MRI. 

Once pain generators are identified, 

Interventional Pain Management can be applied for the said pain generators with the help of advancement in the field...