Anonymous,
It could be one of the reasons. Health issues can be a part of the dream since the pain is an emotional issue. If the back is severe enough it cold be a 'serial killer' and you need a pain killer to help alleviate both the physical and psychological pain. But also look at the underlying issues. The building is your whole self and the many 'floors' that make up the building/you. One of those floors is your physical pain. But there are other floors and other aspects of pain, involving psychological pain. There needs to be a cure for both. One could very well cause the other or lend to it.