Lymphoma, Hodgkin
Hodgkin lymphoma is an uncommon cancer that develops in the lymphatic system, which is a network of vessels and glands spread throughout your body.
The most common symptom of Hodgkin lymphoma is a swelling in the neck, armpit or groin. The swelling is usually painless, although some people find that it aches.
Hodgkin lymphoma is caused by a change (mutation) in the DNA of a type of white blood cell called B lymphocytes, although the exact reason why this happens isn't known.
If you see your GP because you're concerned about symptoms of Hodgkin lymphoma, they'll ask about your health and carry out a simple physical examination.
Hodgkin lymphoma can usually be treated successfully with chemotherapy alone, or chemotherapy followed by radiotherapy.
Some people treated for Hodgkin lymphoma experience long-term problems, even if they've been cured.