What is lymphoma? This is a cancer that starts in the lymphocytes, or immune system cells, which are located in the lymph nodes, thymus, bone marrow, and spleen. Abnormally growing lymphocytes causes lymphoma. There is non-Hodgkin lymphoma (the most common) and Hodgkin lymphoma.
What are the causes? The causes are not really known. However, risk factors include people that are older than 60, men, those with a weak immune system due to organ transplants, AIDS/HIV, those born with an immune disorder, those with celiac disease, rheumatoid arthritis, lupus, or another immune system disorder, or those who have had HTLV-1, HHV8, Epstein-Barr, or Hepatitis C.