It's true that quality of life does suffer when a person is faced with chronic pain. Depression can be a natural response to the downward spiral of pain, deconditioning, loss of function, and more pain. But studies show over and over that certain personality types are more likely to become depressed after an injury or problem with back pain.
Some researchers have linked this response to patients who are more likely to catastrophize an event in their lives. This means they blow it out of proportion. Pain and other symptoms escalate and don't respond to treatment with medications, injections, exercise, or rest. Results don't improve with physical therapy or even surgery.
A recent study from the University of Texas (Arlington) used a personality inventory called the MMPI to test almost 1,500 patients with chronic occupational spinal disorders (COSDs). Almost two-thirds had some type of personality disorder. Half had a significant depressive or anxiety disorder. Only seven per cent were in the normal profile (NP) category.
If you tested positive for depression, you may benefit from medical treatment for this condition. Ignoring depression won't make it go away and will almost certainly keep you in the downward spiral mentioned. Starting a course of anti-depressants along with an exercise program could be the start to restored function and improved quality of life.