The higher count usually comes after an illness. It is most often harmless and doesn't last long. But the higher count might be the result of something more serious, such as a blood cancer or a chronic infection. More tests can show if the lymphocyte count is a cause for worry. Lymphocytosis is the presence of too many white blood cells. Learn about the possible causes, symptoms, and treatment options when necessary here. Introduction: High lymphocytes , medically known as lymphocytosis , is a condition characterized by an elevated count of lymphocytes in the bloodstream. Lymphocytes are a type of white blood cell that plays a crucial role in the body’s immune system, helping to defend against infections and diseases. While an increase in lymphocyte count can be a normal response to infections, it can also indicate underlying health issues. In this comprehensive guide, we will delve into the causes, symptoms ... Lymphocytes are white blood cells that help fight infections and maintain immune health. Learn what a normal lymphocyte range is, what causes abnormal levels and when to see a doctor for possible cancer.