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Myeloma, also known as multiple myeloma, is a cancer arising from plasma cells, a type of white blood cell which is made in the bone marrow. The bone marrow is where all blood cells are madeand is the ‘spongy’ material found in the centre of the larger bones in the body..
Plasma cells form part of your immune system by producing antibodies, also called immunoglobulins, to help fight infection.
In myeloma, these plasma cells become abnormal, multiply uncontrollably and release only one type of antibody – known as paraprotein – which has no useful function. The measurement of paraprotein is a key indicator that myeloma is diagnosed.
Unlike many cancers, myeloma does not exist as a lump or tumour. Most of the medical problems related to myeloma are caused by the build-up of the abnormal plasma cells in the bone marrow and the presence of the paraprotein in the blood or in the urine.
Myeloma affects multiple places in the body (hence ‘multiple’ myeloma) where bone marrow is normally active in an adult i.e. within the bones of the spine, skull, pelvis, the rib cage, long bones of the arms and legs and the areas around the shoulders and hips.
Myeloma is a relapsing-remitting cancer. This means there are periods when the myeloma is causing symptoms and/or complications and needs to be treated, followed by periods of remission or plateau where the myeloma does not cause symptoms and does not require treatment.
Adapted from - http://www.myeloma.org.uk/information/what-is-myeloma/