digestive disorders
Gastritis
Diagnosis of Gastritis
Upper endoscopy A doctor suspects gastritis when a person has upper abdominal discomfort, pain, or nausea. Tests usually are not needed. However, if the doctor is uncertain of the diagnosis, or if symptoms do not resolve with treatment, the doctor may do Endoscopy . During upper endoscopy, a doctor uses an endoscope (a flexible viewing tube) to examine the stomach and some of the small intestine. If necessary, the doctor can do a biopsy (removal of a tissue sample for examination under a microscope) of the stomach lining. 