Do you think that multiple myeloma could cause heart disease?

It is possible: Some forms of myeloma secrete a protein called a light chain that can invade organs like the heard or liver and cause it to function poorly. Most of the problems with the heart arise from many of the early treatments of myeloma which included a drug called adriomycin. Modern chemotherapy can still cause heart problems but not at the same rate.

Myeloma: Myeloma can involve the heart directly or infiltrate it with amyloid like tissue. The chemotherapy for myeloma can damage the heart also.