What is Non-Hodgkin lymphoma?
'''Non-Hodgkin [[lymphoma]]''' (which is also known as ''B-cell'' and ''T-cell lymphomas'') is a cancer of the [[lymphatic system]]. The lymphatic system is a network of vessels and [[gland]]s spread throughout the body. It is also part of the [[immune system]]. Clear fluid called ''lymph'' flows through the lymphatic vessels and contains infection-fighting [[white blood cell]]s known as ''[[lymphocyte]]s''. In lymphoma, these lymphocytes start to multiply in an abnormal way. A lot of them appear in certain parts of the lymphatic system, such as the [[lymph node]]s (glands). The affected lymphocytes lose their [[infection]]-fighting properties making you more vulnerable to infection. The most common [[symptom]] of non-Hodgkin lymphoma is a painless swelling in a lymph node, usually in the [[neck (body part)|neck]], [[armpit]] or [[groin]]. The usual way to know that a person has non-Hodgkin lymphoma is to do a [[biopsy]] (testing a sample of affected lymph node tissue). {{biology-stub}} [[Category:Cancer]]