Erythema in the antrum is a condition where the antrum of the stomach appears reddened and inflamed when viewed on an endoscopy. In some instances, the problem is called gastritis, according to Gastro.net.
The occurrence of gastritis can be either sudden or gradual. Helicobacter pylori is a common cause of chronic gastritis. Other causes of gastritis include excessive consumption of alcohol, the use of anti-inflammatory drugs such as aspirin, bile reflux and infections from bacteria and viruses, WebMD reports.
In some cases, patients suffering from gastritis may not have any symptoms, but there are several symptoms associated with gastritis. These symptoms include discomfort or pain in the upper abdomen, mostly after eating, and vomiting. If someone has ulcers, he may vomit blood, according to Gastro.net.
To diagnose gastritis, the doctor does a physical examination, looks at a patient's family medical history and then carries out various tests. Tests may include upper endoscopy test, which is used to check the stomach lining. During endoscopy, he may perform a biopsy, a process that involves scraping tissue from the stomach and sending it for testing in the lab. Blood tests may be done to determine whether the patient has anemia. Fecal occult blood testing involves finding of blood traces in the patient's stool, as stated by WebMD.