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That fear is natural, and the reason why the various bone marrow organizations have all sorts of available brochures and web pages available.

For a first hand account: I've donated bone marrow by peripheral blood stem cell extraction, and it's mostly painless. I'd do it again any day (except I'm not allowed to by my country's organization's policy, but that's another problem). A colleague of mine donated by needle extraction, and didn't report anything traumatic.

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