There are more than 30 distinct types of non-Hodgkin lymphoma, which can be divided into aggressive (fast-growing or high grade) or indolent (slow-growing or low grade) types.
NHL is further divided according to the cell type involved. There are two main types of lymphocytes: B-lymphocytes (or B cells) and T-lymphocytes (or T cells). Most types of non-Hodgkin lymphomas develop from B cells.