High interleukin 2 indicates that the body is in an immune response state. Common causes include viral infections, immune system disorders, and hematologic disorders. 1. Viral infections: the active stage of viral hepatitis such as hepatitis B, hepatitis C, and hepatitis A will cause elevated interleukin 2. 2. Immune system diseases: Rheumatoid arthritis, dry syndrome, multiple sclerosis and other immune system diseases may also cause elevated interleukin 2. 3. Hematologic disorders: Hematologic disorders such as leukemia can also cause elevated interleukin 2. High interleukin 2 may also be caused by other reasons. Once high interleukin 2 occurs, you should go to the hospital in time to find out the cause and get treatment under the doctor’s guidance.