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About 90 percent of patients with axial low back pain recover within six weeks. If the vessel is stretching slowly with time, the pain may be chronic or intermittent in nature. A variety of structures in the lower back can cause axial or mechanical lower back pain, such as a degenerated disc, facet joints problems, and damage to soft tissues - muscles, ligaments, and tendons - and it is often difficult to identify which anatomical structure(s) is the underlying cause of the pain. Axial back pain can vary widely from sharp or dull pain, constant or intermittent pain, or mild to severe pain