This procedure replaces your damaged bone marrow with special blood-forming cells called hematopoietic stem cells. You can get them from a donor, or doctors can collect your own cells ahead of time and give them back to you. First, you’ll have chemotherapy to destroy the cancer cells in your body. Then the transplant puts new cells in to start making healthy bone marrow. The entire process takes several weeks. How much of that time you spend in the hospital depends on the specifics of your condition.
Note that a stem cell transplant is generally reserved for people whose multiple myeloma has potential for being cured.