Normal ultrasound examination but elevated alpha-fetoprotein after liver cancer surgery may be caused by tumor recurrence, hepatitis, cirrhosis and other diseases. 1. Tumor recurrence: liver cancer has the possibility of recurrence, and normal ultrasound but elevated alpha-fetoprotein after liver cancer surgery may be tumor recurrence. 2. Hepatitis: it is an inflammatory disease of liver caused by microbial infection, immune reaction, drug action and other factors, which will lead to elevated alpha-fetoprotein. 3. Cirrhosis: it is a chronic liver disease caused by fatty liver disease, immune disease, drugs or chemical poisons, which will lead to elevated alpha-fetoprotein. Normal ultrasound examination after liver cancer surgery but elevated alpha-fetoprotein may also be seen in other liver diseases such as liver tuberculosis, liver abscess, etc. If the symptom of normal ultrasound examination after liver cancer surgery but elevated alpha-fetoprotein occurs and persists unrelieved, it is necessary to seek medical treatment in time.