Is idiopathic lymphocytosis a thing? i have had lymphocytosis for >1.5yr, (prev doc never said anything) but no determinable cause. also have anemia

Ideopathic=Basis not: understood. Lymphocytosis: vague term for ↑ed concentration of lymphocytes (5 major types) in peripheral blood count than considered usual (Many Docs don't mention what they don't understand.). If a colony of lymphocytes in bone marrow are reproducing fast & crowding out RBC reproduction, this could be one basis for the anemia. If severe enough this is called leukemia; many different seventies.