Around 1,800 people are diagnosed with Hodgkin lymphoma each year in the UK.
Although people can develop Hodgkin lymphoma can at any age, this blood cancer has two incidence peaks - one in young adults, and the second in older people.
People with Hodgkin lymphoma produce abnormal lymphocytes - a certain type of white blood cell that fights infection. These cells cluster together to form lumps in the lymph nodes, or ‘glands’.
In Hodgkin lymphoma, the abnormal lymphocyte cells are called Reed–Sternberg cells. Any other lymphoma without these cells is called a non-Hodgkin lymphoma.
There are two main types of Hodgkin lymphoma - classical Hodgkin lymphoma (95% of people have this type) and nodular lymphocyte-predominant Hodgkin lymphoma (NLPHL).
People with Hodgkin lymphoma are usually given chemotherapy, and in some cases radiotherapy and steroids. If this doesn’t work, higher doses of chemotherapy may be given, followed by a stem cell transplant.