Carcinoembryonic antigen 6.6ng/ml is mildly elevated, indicating that the patient may have some kind of inflammation, such as pancreatitis, cirrhosis of the liver, etc., or it may be related to some kind of cancer, such as digestive malignant tumors, etc. It is a commonly used tumor marker and its value is usually <5ng/ml. Carcinoembryonic antigen (CEA) is a commonly used tumor marker with a value of <5ng/ml, which is mainly seen in malignant tumors of the digestive system, lung cancer, breast cancer and other malignant tumors, while mild elevation is also seen in benign digestive diseases such as intestinal obstruction, biliary obstruction, pancreatitis, cirrhosis of the liver, colorectal polyps, ulcerative colitis, as well as in smokers and the elderly. It is suggested that patients should carry out further examination in time, if the carcinoembryonic antigen is only elevated, then there is no need to worry about it, if it is a benign disease need to be treated symptomatically, if it is related to cancer, it is necessary to deal with it in time, and cooperate with the doctor positively for the treatment.