In order to prevent back strains, do not lift anything too heavy. Many times, chronic back pain is caused by someone picking up objects that are too heavy which strains their back. You can avoid this pain by only lifting objects that you know your body, and more specifically, your back, can handle.
Just like with any other type of illness, regular checkups with your doctor can go a long way in preventing back pain and various back problems. Your doctor is trained to keep an eye out for such complications and symptoms, and he or she can do a lot of things for you.