High alpha-fetoprotein is not necessarily cancer, but may also be caused by liver injury, female pregnancy and other conditions. 1. Tumor: in clinic, alpha-fetoprotein can be used as a tumor marker, when there is primary liver tumor, alpha-fetoprotein will be abnormally high. Malignant tumors such as digestive system tumors and lung tumors can also cause elevation of alpha-fetoprotein. 2. Liver injury: patients with liver injury due to cirrhosis or acute hepatitis, chronic hepatitis, etc. will cause high alpha-fetoprotein. 3. Pregnancy: women can also have elevated alpha-fetoprotein after pregnancy. Once you find high alpha-fetoprotein, you should consult a doctor in time to improve the examination and find out the cause of the disease, so as not to delay the condition.