Multiple myeloma is a cancer of your plasma cells. Plasma cells are a type of white blood cell present in your bone marrow.
In multiple myeloma, a group of abnormal plasma cells (myeloma cells) multiplies, raising the number of plasma cells to a more than normal level. The result can be erosion of your bones. The disease also interferes with the function of your bone marrow and immune system, which can lead to anemia and infection. Multiple myeloma may also cause kidney problems.
The disease is called multiple myeloma because myeloma cells can occur in multiple bone marrow sites in your body.
If you have multiple myeloma but don't have symptoms, your doctors may just monitor your condition. If you're experiencing symptoms, various treatments are available.
Although multiple myeloma may not cause symptoms early in the disease, it's likely that you'll experience signs and symptoms as the disease progresses.