There are three primary types of bone marrow transplants:
1. Autologous Transplant: The patient's own stem cells are used. 2. Allogeneic Transplant: Stem cells come from a donor, who may or may not be related. 3. Syngeneic Transplant: Stem cells are donated by an identical twin.
Each type has varying risks and benefits, and the choice depends on the patient's condition, the availability of a suitable donor, and other health factors.