Hello, Anon. Thank you for your message.
Lymphocytes are one of several different types of white blood cells. Lymphocyte counts that are either too low or too high may mean you have an infection or illness. When you recover, your lymphocyte levels will return to normal. If abnormal lymphocyte counts persist, your outlook depends on the underlying condition.
Lymphocytosis or a high lymphocyte count is an increase in white blood cells. They help fight off diseases, so it's normal to see a temporary rise in the number of lymphocytes after an infection.
Lymphocytopenia is an abnormally low number of lymphocytes in the blood. Many disorders can decrease the number of lymphocytes in the blood, but viral infections (including AIDS) and undernutrition are the most common.
Conditions that can cause higher or lower numbers include certain cancers, including lymphocytic anemia, Hodgkin disease, autoimmune diseases, HIV, AIDS, Influenza, chemotherapy, and radiation, among others.