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Multiple myeloma

Definition

Multiple myeloma is cancer of the plasma cells in bone marrow.

Alternative Names

Plasma cell dyscrasia; Plasma cell myeloma; Malignant plasmacytoma; Plasmacytoma of bone; Myeloma - multiple

Causes, incidence, and risk factors

Plasma cells help the body's immune system fight disease by producing substances called antibodies. In multiple myeloma, plasma cells grow out of control and form tumors in the bone marrow.

The excess growth of plasma cells interferes with the body's ability to make red blood cells, white blood cells, and platelets. This causes anemia, which makes a person more likely to get infections and have abnormal bleeding.

As the cancer cells grow in the bone marrow, they can cause pain and destruction of the bones. If the bones in the spine are affected, it can put pressure on the nerves, resulting in numbness or paralysis.

Multiple myeloma mainly affects older adults. A history of radiation therapy raises your risk for this type of cancer.

Symptoms

  • Bleeding problems
  • Bone or back pain
  • Increased susceptibility to infection
  • Symptoms of anemia (such as tiredness, shortness of breath, and fatigue)
  • Unexplained fractures

Signs and tests

Blood tests can help diagnose this disease. They may include:

Bone x-rays show fractures or hollowed out areas of bone. If your doctor suspects this type of cancer, a bone marrow biopsy will be performed.

Treatment

The goal of treatment is to relieve symptoms.

People who have mild disease or a questionable diagnosis are usually carefully monitored without treatment. Some people have a slow-developing form of multiple myeloma that takes years to cause symptoms.

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