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Non-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 lymphatic system is part of your immune system. Clear fluid called lymph flows through the lymphatic vessels and contains infection-fighting white blood cells known as lymphocytes.
In non-Hodgkin lymphoma, the affected lymphocytes start to multiply in an abnormal way and begin to collect in certain parts of the lymphatic system, such as the lymph nodes (glands). The affected lymphocytes lose their infection-fighting properties, making you more vulnerable to infection.
The most common symptom of non-Hodgkin lymphoma is a painless swelling in a lymph node, usually in the neck, armpit or groin.
Read more about the symptoms of non-Hodgkin lymphoma.
In the UK, more than 12,000 people are diagnosed with non-Hodgkin lymphoma each year.
Non-Hodgkin lymphoma can occur at any age, but your chances of developing the condition increase as you get older, with most cases diagnosed in people over 65. Slightly more men than women are affected.
The exact cause of non-Hodgkin lymphoma is unknown. However, your risk of developing the condition is increased if:
You also have a slightly increased risk of developing non-Hodgkin lymphoma if a first-degree relative (such as a parent or sibling) has had the condition.
Read more about the causes of non-Hodgkin lymphoma.
The only way to confirm a diagnosis of non-Hodgkin lymphoma is by carrying out a biopsy.
This is a minor surgical procedure where a sample of affected lymph node tissue is removed and studied in a laboratory.
Read more about diagnosing non-Hodgkin lymphoma.
There are many subtypes of non-Hodgkin lymphoma, but they can generally be put into one of two broad categories:
The outlook for non-Hodgkin lymphoma varies greatly, depending on the exact type, grade and extent of the lymphoma, and the person’s age.
Low-grade tumours don't necessarily require immediate medical treatment, but are harder to completely cure. High-grade lymphomas need to be treated straight away, but tend to respond much better to treatment and can often be cured.
The main treatments used for non-Hodgkin lymphoma are:
Overall, most cases of non-Hodgkin lymphoma are considered very treatable. You can read more detailed information about the outlook for non-Hodgkin lymphoma on the Cancer Research UK website.
However, there's a risk of long-term problems after treatment, including infertility and an increased risk of developing another type of cancer in the future.
Read more about:
If you have non-Hodgkin lymphoma, your clinical team will pass information about you on to the National Congenital Anomaly and Rare Diseases Registration Service (NCARDRS).
This helps scientists look for better ways to prevent and treat this condition. You can opt out of the register at any time.