I use Cadmium Sulph for patients who are getting pains at the top of the spine. They point to one particular part and say that is what hurts them. I am always surprised at how well it works.
Classical Homeopathy – Margaret Blackie
Cadmium Sulfuratum in Kent's MM
Cadmium Sulfuratum in Boericke's Materia Medica
Maharana Homoeo Reader