Generally, gastritis does not cause elevated CA199, a tumor marker that is seen mainly in patients with pancreatic cancer, which means that patients with pancreatic cancer will show a significant increase in CA199. Also, it is often seen in diseases such as bile duct cancer and gallbladder cancer. For some non-tumor diseases, such as chronic pancreatitis, gallbladder stones, and cirrhosis of the liver, a mild elevation of CA199 can also occur. If a patient only has gastritis and has a significant increase in CA199, he or she needs to be alerted to the presence of other specific diseases in the body, so it is recommended that the patient visit a hospital if necessary and cooperate with the doctor to give a detailed examination to clearly rule out tumor-related problems.