what can cause pain in the very lowest part of my back
The most common causes of low back pain are: 1  Injury or overuse. 2  Pressure on nerve roots from conditions such as a herniated disc or spinal stenosis. 3  OsteoarthritisOsteoarthritis, which is usually caused by getting older. 4  When osteoarthritis affects the small joints in the spine, it can lead to back pain by making the joints themselves stiff and ...