What is Non-Hodgkin lymphoma?

Non-Hodgkin lymphoma is a type of lymphoma, a cancer that begins in the lymphatic system. The lymphatic system is an important part of the immune system and includes the various lymph glands around the body. Non-Hodgkin lymphoma most commonly occurs in a lymph node but it can also occur in the liver, spleen, stomach or bones. There are more than 60 sub-types of non-Hodgkin lymphoma and they vary in how fast they grow and spread, and how sick people feel.

There are two classifications of non-Hodgkin lymphoma: B-cell lymphomas which account for around 85% of lymphomas, and T-cell lymphomas.  

https://www.cancer.org.au/cancer-information/types-of-cancer/non-hodgkin-lymphoma