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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.
Causes of swollen lymph nodes. There are many causes for swollen lymph nodes. Most commonly, lymph nodes become swollen due to an infection, such as a viral upper respiratory infection like the common cold. Sometimes, lymph node swelling is caused by an underlying condition.