Multiple myeloma accounts for approximately 1% of neoplastic diseases and 13% of hematologic cancers. Complications often associated with MM include neurologic and hematologic issues, infections, renal insufficiency, and bone involvement. It is crucial for advanced practice professionals caring for myeloma patients to assess patients accurately, be keenly aware of possible associated complications, and be familiar with appropriate interventions to prevent further injury. This article will provide an overview of MM-related renal insufficiency, with a focus on cast nephropathy, venous thromboembolism, and neurologic complications along with various causes and treatment options; a future article will address additional complications associated with MM.