C90.0: Multiple myeloma

Multiple myeloma is a type of cancer that begins in plasma cells, a type of white blood cell that produces antibodies to fight off infections. It manifests when plasma cells become abnormal and grow out of control, forming a tumor typically within the bone marrow - the soft, sponge-like tissue in the center of most bones. Signs and symptoms may vary widely from person to person. Common ones, however, may include fatigue (due to anemia), bone pain (especially in the back or ribs), frequent infections (due to immune suppression), unexplained weight loss and kidney problems. Over time, these abnormal plasma cells can crowd out the healthy cells in the bone marrow leading to further complications. Multiple myeloma typically presents in individuals over the age of 60, and it's slightly more common in men than in women. The exact cause of this condition is unknown.