The length of hospitalization for multiple myeloma varies and depends on the condition, ranging from as short as 4 to 5 days to more than a few months. When multiple myeloma is first detected, it has to be judged by appropriate diagnosis and examination, and then treated after the diagnosis is confirmed, the first hospitalization may be longer, and if combined with the first induction chemotherapy, it may take more than 1 month. Choice of treatment regimen: 1. If treatment with MP (Markland, prednisolone) regimen is performed alone, hospitalization takes 4-5 days. 2. if treated with bortezomib, there are 2-week or 4-week regimens, and the length of hospitalization will be 2 or 4 weeks. 3. If treated with CAR-T (chimeric antigen receptor T cell therapy) regimen, the hospitalization time may be 1~2 months. 4. With autologous hematopoietic stem cell transplantation, after one or both transplants, the hospital stay may be a little longer. If the diagnosis of multiple myeloma is confirmed, it is recommended that timely hospital consultation and standardized treatment under the guidance of a doctor be carried out to minimize the adverse effects.