Back pain is a disease of modern times. Most people have low back pain at some point of time. Mostly people who experience lower back pain for first time get better in 2-6weeks. However chronic back pain or recurrent back pain requires special management.
Wrong posture.
Wear & tear of spine called degeneration.
Prolonged sitting in one place without movement.
Injuries to spine.
Picking heavy objects causing a jerk to the spine.