Non-Hodgkin's lymphoma (NHL) is a type of cancer that affects the lymphatic system, which is a part of the immune system. The exact cause of NHL is unknown, but potential risk factors include older age, weakened immune system, exposure to certain chemicals, radiation exposure, and infection with certain viruses such as HIV and Epstein-Barr virus. Symptoms of NHL may include swollen lymph nodes, fever, night sweats, fatigue, and unexplained weight loss. Diagnosis is typically made through biopsy and imaging tests, and treatment may involve chemotherapy, radiation therapy, targeted therapy, immunotherapy, and stem cell transplantation, depending on the type, stage, and characteristics of the cancer.

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