What is?
Non-Hodgkin lymphoma (also known as non-Hodgkin's lymphoma, NHL, or sometimes just lymphoma) is a cancer that starts in cells called lymphocytes, which are part of the body's immune system. Lymphocytes are in the lymph nodes and other lymphoid tissues (such as the spleen and bone marrow). These will be described in more detail in the section "The lymph system and lymphoid tissue."
Some other types of cancer -- lung or colon cancers, for example -- can spread to lymph tissue such as the lymph nodes or bone marrow. But cancers that start in these places and then spread to the lymph tissue are not lymphomas.
There are 2 main types of lymphomas.
Hodgkin lymphoma (also known as Hodgkin's lymphoma, Hodgkin disease, or Hodgkin's disease) is named after Dr. Thomas Hodgkin, who first described it.
non-Hodgkin lymphoma
These 2 types of lymphomas differ in how they behave, spread, and respond to treatment.
Doctors can usually tell the difference between them by looking at the cancer cells under a microscope. In some cases, sensitive lab tests may be needed to tell them apart.
Hodgkin disease is discussed in a separate American Cancer Society document. Our other documents focus on non-Hodgkin lymphoma in children and lymphomas of the skin.
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