How does the absolute value of lymphocytes increase?

The absolute number of lymphocytes in normal adult peripheral blood is between 4000-2000/mL. If it increases, it may be suffering from hematological diseases, such as acute and chronic lymphocytic leukemia. It may also be suffering from infectious diseases, such as measles, rubella, mumps, infectious mononucleosis, viral hepatitis, adenovirus, etc. In addition, it can also be seen in neoplastic diseases, and in the recovery period of acute infectious diseases, there will also be an increase in the absolute value of lymphocytes.