A 50-year-old man has been suffering from substernal pain for the last 5 months, particularly on waking up in the morning. He lost his job a year ago and was suffering from depression. He consumes about 12–16 cans of beer every day. He has lost his appetite too and says that eating aggravates pain.
*Is this acute or chronic gastritis?
*What factors may lead to the development of gastritis?
*What investigation should be performed?
*How can the patient be treated?