Has anyone experienced breathlessness as a side effect of myeloma? It was breathlessness that first took me to the GP in 2018 and led to the myeloma diagnosis. I also had it from mid 2021 as my myeloma returned after VTD and SCT in 2019. I have finally been diagnosed with angina, shortly before a heart attack last October, but there is still some debate between my cardiologists and haematologists as to the cause of the breathlessness.