Multiple myeloma is a cancer of the plasma cells in the bone marrow. As these white blood cells multiply, they leave little room for healthy cells. They can also damage the bone marrow, develop into growths or destroy the bones. Multiple myeloma is not a common cancer – the lifetime risk is about 1 in 143, according to Cancer.Net. There is no cure for multiple myeloma. Early detection can help you seek treatment to manage the disease and avoid any harmful side effects of the condition, such as kidney failure, bone fractures, numbness, weakness, paralysis, and infections.