A fetoprotein of more than seven hundred may be malignant diseases such as liver cancer, testicular cancer, or benign diseases such as hepatitis and cirrhosis of the liver, and patients need to undergo further examination for clarification. Alpha-fetoprotein is mainly synthesized by fetal liver cells and yolk sac. After the birth of the fetus, the level of alpha-fetoprotein decreases, and after the age of 2~3 months, alpha-fetoprotein is replaced by albumin, and the amount of alpha-fetoprotein in the blood is relatively small. The normal alpha-fetoprotein in human serum is generally <25ng/mL. More than seven hundred of alpha-fetoprotein may be primary liver cancer, testicular cancer, ovarian tumor, pancreatic cancer, gastric cancer and other malignant diseases, in addition, some benign diseases can also be seen in the elevation of alpha-fetoprotein, such as acute and chronic hepatitis, cirrhosis of the liver, etc., but usually lasts for 2-3 weeks, while malignant tumors will be persistently elevated. It is recommended that patients should ask professional doctors to clarify the causes based on clinical symptoms and other auxiliary examinations, and then carry out treatment as early as possible.