When these lymphocytes become malignant, they multiply continuously and lymph nodes become larger and larger even in the absence of an infection.

How quickly do cancerous lymph nodes grow?

If the lymph node is cancerous, the rapidity with which the lump arises and grows depends on the type of lymphoma that is present. In rapidly growing lymphomas, lumps can appear in a matter of days or weeks; in slower-growing types, it can take months or even years.

Can cancerous lymph nodes increase and decrease in size?

Sometimes the disease is active, making lots of cancerous cells, while at other times it quietens down and some of the cells die. This means the swollen lymph nodes can sometimes grow and shrink, especially in people with low-grade non-Hodgkin lymphoma.