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My half sister and I have CD, our father had MM. Our grandfather and paternal aunt also likely had MM, they were diagnosed and died in the '70s of bone cancer. My father had extreme CD symptoms his entire life but was never diagnosed.
While I am now on a gluten free diet, I may have been diagnosed so late the damage has already been done. I am battling never ending infections (that ultimately end up in my kidneys), and was diagnosed with osteoporosis and spinal fractures at 43.
There is a demonstrated genetic relationship in Celiac Disease and researchers are now studying the possibility that genetics plays a role in MM. Whether or not there is a direct relationship remains to be seen, but the similarities in my symptoms and my dad's pre-MM diagnosis terrify me.