Monocyte elevation is usually found in two major types of diseases: 1. Blood disorders, including acute mononuclear leukemia and infectious mononucleosis in the hematologic system, can have monocyte elevation. 2. The increase in monocytes is usually evident in viral infections. Monocytosis is usually seen in infected target organs such as respiratory tract infections, digestive tract infections, urinary tract infections, pelvic infections and skin infections. 3. Non-infectious diseases such as connective tissue diseases, immunoproliferative diseases or immune dysfunctions may also show the above clinical symptoms, such as dermatomyositis and systemic lupus erythematosus. 4. diseases, such as anemia, tumors, AIDS, etc., will show mononucleosis.