I have had lower back pain for years. Sometimes worse than others. It worsens when I do physical activities such as lifting, vacuuming, etc. Standing doesn't affect it; it is usually worse when sitting or lying down - I awake many nights with pain. I had an x ray when came back clear. I have seen a chiropractor with no results. My fear is cancer. From what I have read, that seems to be the answer to that type of pain. Could anything else cause back pain like mine and it not be cancer?