Patients with gastritis do not develop elevated carcinoembryonic antigen, which is mostly seen in colorectal and lung cancers, as well as liver metastases. It can also be seen in non-neoplastic diseases, such as inflammatory bowel disease, intestinal polyps, cirrhosis, hepatitis, pancreatitis, and asthma. There are also non-disease factors that can lead to elevated carcinoembryonic antigen, such as people who take certain medications during pregnancy or who are long-term smokers. For gastritis, the diagnosis can be confirmed with an electrogastroscopy. Patients with gastritis can see gastric mucosa congestion and edema with foci of erosion under endoscopy. If clinical symptoms are present, symptomatic medications such as oral acid suppressants or gastric mucosal protectors can be given in conjunction with a specialist.