Bone marrow transplantation is a medical procedure used to replace damaged or diseased bone marrow with healthy bone marrow. This treatment is often necessary for patients with conditions like leukemia, lymphoma, or aplastic anemia. The healthy marrow can come from a donor or the patient themselves, depending on the situation. The process involves several steps, including chemotherapy or radiation to prepare the patient’s body, followed by the infusion of the new bone marrow. Once transplanted, the new marrow can produce healthy blood cells, helping the patient recover and regain their strength.