While IgD-MM typically presents at an advanced stage in younger patients, with a poorer prognosis compared to other myeloma subtypes, in this case, the patient presented at an older age (74) with prodromal symptoms. In patients admitted for further investigation with suspected multiple myeloma, before diagnosing light chain MM, it is crucial to conduct advanced tests, including IgD and IgE testing in both serum and serum immunofixation electrophoresis. The gene discussed is IGHE; the disease is plasma cell myeloma.