CA199 single elevation, if it is mildly elevated, there is no need to worry too much; if it is exponentially elevated, you should go to the hospital in time to find out the cause of the disease and treat the symptoms. CA199 belongs to tumor-associated antigen, normal value <37u/ml. When CA199 is elevated in the organism, there are two main conditions to consider: gastrointestinal inflammation such as inflammatory bowel disease, cholangitis and pancreatitis; gastrointestinal tumors such as colorectal cancer and pancreatic cancer. When CA199 is mildly elevated, gastrointestinal inflammation is highly suspected, and when CA199 is doubly elevated, gastrointestinal tumors need to be considered initially. In addition, the value of CA199 can also be elevated in the presence of autoimmune disorders, such as ankylosing spondylitis and systemic lupus erythematosus, in the active phase of the disease. Therefore, if there is a single elevation of CA199, you should go to the hospital in time and follow the doctor's instructions for rational diagnosis and treatment.