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Search form. Causes. The cause or causes of lymphoma are largely a mystery. There may be some genetic predisposition, or it may be caused by an environmental trigger such as pollution. There is not, however, sufficient evidence to provide a definitive answer.
Some lymphomas are caused by treatment of cancers with radiation and chemotherapy or by the use of immune-suppressing drugs to avoid rejection of transplanted organs. Doctors are trying to find better ways to treat cancer and organ transplant patients without increasing the risk of lymphoma as much.