Gastroscopy can clarify chronic non-atrophic gastritis. If a patient presents with vague pain or distension in the upper abdomen, such as subxiphoid or mid-upper abdomen. If there are also symptoms in the digestive tract, such as acid reflux, belching, nausea, vomiting, burping, or even black stools, it is more likely that the patient is suffering from chronic non-atrophic gastritis. In this case, you can go to the hospital and your doctor will usually prescribe gastroscopy and other related tests for clarification. Chronic non-atrophic gastritis is usually seen on gastroscopy as mucosal erythema, hemorrhage, mucosal roughness, with or without edema, congestion, exudation, and other basic signs of erosion, bleeding, or bile reflux. It is usually described as chronic non-atrophic gastritis with erosion and bile reflux at the time of diagnosis. Clinically, the disease is usually mild and treatment is mainly based on anti-infective therapy. When symptoms are present, treatment can be administered with acid-suppressing drugs, gastric motility-promoting drugs, gastric mucosal protective agents, such as omeprazole, rabeprazole, esomeprazole, etc., as prescribed by the doctor. In addition, a combination of oral amoxicillin or clarithromycin can be administered under medical supervision. Patients undergoing gastroscopy need to be aware that they should generally try to avoid hard-to-digest food two days before the examination. Fasting 6-8 hours prior to the examination and abstaining from water 4 hours prior to the examination to avoid the presence of stomach contents that could interfere with the examination and affect the results. Since gastroscopy is performed through the throat into the stomach, it is normal that patients may experience a vomiting reaction. After the gastroscope enters the body, the patient needs to keep the body still to avoid damage to internal organs due to activity, and also needs to be careful not to make swallowing movements.