What is treated with a transplant

Every condition here can be treated, in at least some people, with a bone marrow or blood stem cell transplant. For each one: what it is, what causes it, what it does to a person, how it is treated, and what people go through.

Each page also says plainly what part a donor actually plays — including the conditions where the answer is none, because the transplant uses the person’s own cells. That is true far more often than most people expect, and we would rather say so than let you assume otherwise.