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Non-Hodgkin Lymphoma and the Environment. Non-Hodgkin's lymphomas are a group of cancers that start in lymphoid tissue, also called lymph or lymphatic tissue. The causes of Non-Hodgkin lymphomas are mostly unknown. Specific viruses, immune deficiency, and specific autoimmune conditions have been implicated in increased risk. However, some environmental issues, including exposures to pesticides and solvents, are also being investigated.
Cancer-related lymphoedema is caused by cancer treatments or the cancer itself: 1  Surgery to remove lymph nodes can interrupt the normal flow of the lymphatic system, leading to a build-up of fluid in the affected area. 2  Radiotherapy to the lymph nodes can cause scar tissue that blocks the flow of lymph fluid.