If you see blood in your vomit or stool, your stomach lining may be bleeding a bit. The doctor eases a gastroscope, a thin tube containing a tiny camera, through your mouth and down into your stomach to look at the stomach lining. The doctor will check for inflammation and may remove a tiny sample of tissue for tests. This procedure to remove a tissue sample is called a biopsy. The doctor may check your red blood cell count to see whether you have anemia, which means that you do not have enough red blood cells.
Anemia can cause gastritis.
This test checks for the presence of blood in your stool, a sign of gastritis. Treatment usually involves taking antacids and other drugs to reduce stomach acid and thereby help relieve symptoms and promote healing. You will also need to avoid any foods, beverages, or medicines that cause symptoms. If smoking is the problem, you should quit. If your gastritis is related to an illness or infection, that problem will have to be treated as well.