It is the inflammation or irritation of the lining of the stomach. It presents itself as a burning sensation in the “pit of the stomach” together with inflammation or stiffness, and in some cases nausea and vomit. An endoscopic procedure is necessary to determine the origin of the damage in the stomach, which can result from a variety of conditions including erosions, ulcers, tumors or cancerous lesions, to provide the appropriate treatment and work toward the recovery of the patient.