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What is multiple myeloma?

Multiple myeloma (also called Kahler disease or plasma cell myeloma) is a type of cancer that begins in the blood's plasma cells. Made in the bone marrow (the soft, inner part of some bones), plasma cells are a type of white blood cell (B lymphocyte) that produces antibodies (e.g., monoclonal proteins or M-proteins) which fight infection.

Multiple myeloma causes an excess of abnormal plasma cells (myeloma cells), which form tumors in multiple locations throughout the bone marrow. These tumors begin to overcrowd the bone marrow and prevent normal reproduction of healthy blood cells.


Although it only accounts for one percent of overall cancers, multiple myeloma is the second most prevalent blood cancer after non-Hodgkin lymphoma. The International Myeloma Foundation reports that each year there are approximately 20,000 new multiple myeloma incidences in the United States. This represents approximately 20 percent of blood cancers, and 1 percent of all types of cancer.

Multiple myeloma is more common in African Americans than white Americans, with a male/female ratio of 3 to 2. Multiple myeloma incidences also rise with age. The average age at diagnosis is 60, while people under 40 rarely develop the disease.

How multiple myeloma develops

There are many kinds of cells that make up our blood, including red blood cells (RBCs), white blood cells (WBCs) and platelets. A particular category of WBCs, called lymphocytes, are a vital part of our immune defense.

There are two main types of lymphocytes, B lymphocytes (B cells) and T lymphocytes (T cells), both of which originate in the bone marrow. As the B cells mature, some develop into plasma cells. Plasma cells help the body’s immune system fight disease by producing antibody proteins in response to bacterial infections or viruses.

When malignant plasma cells (or myeloma cells) collect in only one bone and form a single mass or tumor, it is called a plasmacytoma. In most cases, however, the myeloma cells grow out of control and collect in many bones, often forming many tumors. When this happens, the disease is called multiple myeloma.

Types of multiple myeloma

Learn about different types of multiple myeloma.

Multiple myeloma symptoms

Read about common multiple myeloma symptoms.

Multiple myeloma risk factors

Read about common risk factors for multiple myeloma.

Multiple myeloma stages

Learn about the stages of multiple myeloma.

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