My father is 75 years old. He has not been feeling well for about two weeks. Barely eating anything at all during this time. He says his back is giving him a lot of pain. He had xrays, I do not know the results, and doctors gave him pain medicine for his back. My dad is a fairly hard drinker and smokes cigars, the little slim ones, daily. I want him to go get some blood test, just to be on the safe side. Any ideas to why he is having back pain, that will not go away, and not eating?