Is there cancer if the tumor markers are normal?

Tumor markers are generally blood test items, can be used as malignant tumor screening, as well as the basis for review after treatment, but not all tumors will show abnormal tumor markers. Tumor markers are not specific, there are some tumors do not show increased tumor indicators, in malignant tumors, in addition to blood tests, but also other imaging tests. Including color Doppler ultrasound, and ct examination. Lung ct examination is the preferred screening method for lung cancer. For digestive system diseases, gastroscopy and enteroscopy should be considered. Especially for family history and areas with high incidence of tumors, screening for malignant tumors should be carried out regularly.