Lymphoma cancer

Lymphoma occurs when abnormal cells in the body’s lymphatic system grow in an uncontrolled way.

The lymphatic system is part of the immune system and is made up of:

• Lymphatic vessels: tiny vessels that collect waste products from the body’s tissues in fluid called lymph.
• Lymph: contains white blood cells including cells called lymphocytes. Lymphocytes help protect the body against infections.
• Lymph nodes: these store white blood cells and help to filter out waste products.

The immune system also includes tissues such as bone marrow, tonsils and the spleen.

Approximately 70–80% of lymphomas develop in the lymph nodes and the rest develop outside of the lymph nodes.