Gastritis is inflammation of the liner of the stomach. It may occur as a short episode or may be of an extended duration. There can be no symptoms but, when signs and symptoms are present, the most commonplace is upper abdominal pain. Other possible signs and symptoms include nausea and vomiting, bloating, loss of appetite and heartburn. Complications may consist of bleeding, belly ulcers, and belly tumours. When because of autoimmune problems, low pink blood cells because of not sufficient vitamin B12 may arise, a condition known as pernicious anemia. Gnawing or burning ache or pain (indigestion) in your higher stomach that may emerge as either worse or higher with eating, Nausea, Vomiting, A feeling of fullness in your higher abdomen after eating.