Multiple myeloma is a malignant disease of bone marrow plasma cell origin with various manifestations, whether it is IgE, IgD, IgA or light chain type, all of them can have the following manifestations: 1. Some patients may have dizziness, tinnitus, or even cerebral infarction and other cardiovascular diseases; 3. Kidney insufficiency may also occur; 6. Oedema due to hypoproteinemia, etc.