The precise cause of non-Hodgkin lymphoma remains a mystery. Some varieties of the disease have been linked to viruses. The disease starts when white blood cells called lymphocytes, produced in the lymphatic system and normally used by your body to fight off germs and infections, continue to reproduce rather than dying off to be replaced by new cells. The buildup of these cancerous cells causes the formation of tumors, which can spread to other parts of the body.
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