Not wanting to eat after leukemia bone marrow transplantation may be due to loss of sense of taste or rejection reaction. 1. Diminished sense of taste: Generally speaking, for a period of time after bone marrow transplantation, the functions of various organs of the patient’s body will be diminished to different degrees, which may be accompanied by changes in the sense of taste, showing no desire for food and drink. 2. Rejection reaction: after bone marrow transplantation for leukemia patients, a certain degree of rejection reaction may occur. When the rejection reaction is large, the gastrointestinal tract may have some abnormalities, resulting in the clinical manifestation of not wanting to eat or not being able to eat. After leukemia bone marrow transplantation, when the symptoms of not wanting to eat appear, it is recommended to consult a doctor in time and seek professional doctor’s guidance.