A high lymphocyte count could mean your body is thwarting off am infection. The flu is common for producing a high lymphocyte count. More serious illnesses such as tuberculosis, hepatitis can cause a high count as well. A high count could indicate a serious condition known as leukemia, which is why a high count will be monitored.
A high lymphocyte count can mean many things, including that you have an infection. Too many white blood cells are an indication that your body is fighting off an infection of some sort. Often a doctor will put a patient on antibiotics if the lymphocyte count is too high. It could mean something else, like cancer.
In the majority of cases is it suggests an acute viral infection that the body is fighting. This could also be a result of a chronic bacterial infection. Leukemia may also be a possibility. Make sure your doctor who is treating you gives you a diagnosis or seek another opinion.
All that means is you have a percentage of your white blodd cell count that is high. The doctor should have pamphlets they can give you on the subject that will explain it so that you will better understand.