Hi and thanks for the query, Its too early to think of a cancer with such symptoms. It s true that the bone is a site of predilection of spread (metastasis) of many cancers. However, it might necessary fr a clinical and paaclinical review be done first in this case. A spinal X ray and CT scans are particular useful. Measuring levels of Alkaline phosphatase in blood, gives an indirect measure if the bone or the back has spread cancer from another area. A chest X ray coupled with a clinical review could be very informative. I strongly suggest you consult a primary care physician for an initial complete clinical review and management. He shall then orient you to specific specialists if need be. Thanks and kind regards. Bain LE, MD