Back pain can have causes that are not due to underlying disease. Examples include overuse such as working out or lifting too much, prolonged sitting and lying down, prolonged sitting and lying down, sleeping in an uncomfortable position, or wearing a poorly fitted backpack. According to the American Ass. of Neurological Surgeons, 75 to 85% of Americans will experience back pain in their lifetime. Of those 50% will have more than one episode within a year. In 90% of all cases the pain gets better without surgery. The lower spine is one of the keys to low back pain. What causes back pain? Strain, Structural problems. You only have one body. Take care of it and seek your doctor for further information if needed.