Bone marrow fills the cavities in your bones and produces blood cells. Red blood cells carry oxygen, white blood cells fight germs, and platelets help blood clot. Bone marrow disorders include ...

In multiple myeloma, abnormal plasma cells build up inside bone marrow -- the spongy tissue inside large bones where blood cells are produced. Over time, myeloma cells cause damage to bones, kidneys, ...

MPNs involve overproduction of blood cells, while MDS results in poorly formed cells, affecting blood cell function and counts. Diagnosis requires blood tests, bone marrow biopsy, and genetic testing ...