Diagnosis of esophageal diverticulum, esophageal cancer, stomach hernia, gastric polyps, gastric cancer, gastritis etc. can be placed with gastroscopy. Gastroscopy is performed to examine complaints such as swallowing difficulty, mouth bleed, removal of swallowed foreign bodies, pain in the upper abdominal section, abdominal distention, abdominal gas, refractory anemia, weight loss with unknown cause, enlargement of stenoses, shedding and burning, indigestion, nausea and vomiting. Biopsies can be taken from suspected areas for sending to pathology. A biopsy may also be performed with the intention of placing diagnosis of the bacterium called Helicobacter pylori.