What Is It?
Non-Hodgkin lymphoma is a group of about 30 different blood cancers. It is also called non-Hodgkin's lymphoma, NHL, or lymphoma.
Non-Hodgkin lymphoma begins in the lymph system. The lymph (or lymphatic) system is part of the immune system. It collects and destroys invading organisms such as viruses and abnormal cells. The lymph system protects the body from infection and disease.
The lymph system is a network of tissue, vessels, and fluid (lymph). Lymph nodes are part of the lymphatic system. They filter lymph and store white blood cells (lymphocytes).