This type of lymphoma happens when something goes wrong with the development of certain white blood cells (usually B lymphocytes). This affects your immune system, which means you're more likely to get infections. It can cause your lymph nodes (glands) to swell.

The term low-grade non Hodgkin lymphoma (low-grade NHL) can be used to describe a number of different types of slow-growing lymphoma, including follicular lymphoma, Waldenstrom macroglobulinaemia (WM), mantle cell lymphoma and marginal zone lymphoma.

While the different types of low-grade NHL can cause similar symptoms and may be treated in similar ways, you should speak to your healthcare team about which parts of this information are relevant to you. This section is mainly about follicular lymphoma, which is the most common type of low-grade NHL.

In around 30% of people, low-grade NHL transforms into high-grade non-Hodgkin lymphoma.

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