Based on your answers, some of the most likely causes of your back pain include
degenerative joint disease (also called osteoarthritis)
muscle spasm or strain
fracture (related to osteoporosis or spondylolisthesis).
Other, rarer causes are also possible.
While over-the-counter pain medicines, a heating pad, and rest may be helpful, it is important that you see a physician to evaluate these symptoms, especially if your back pain is not clearly improving over a number of weeks.