At New Century Spine Centers in San Diego, the chiropractors perform nutrition and back stretching classes once a month for their patients. Back pain affects many people. Up to eighty percent of all adults will have at least a single episode of back pain during their life. 50% of those people will never find out the cause of their pain. The most common cause of back pain is a muscular strain or sprain. This is the culprit in around 85% of the cases. Many people will try a variety of home remedies for their back pain, some with very limited success. Others may go to the doctor, however, they will find that the doctors think that 80-90% of all episodes of back pain will clear up on their own, usually in six to twelve weeks time. Sometimes, however, back pain can lead to long term disability.