Gastritis can usually be relieved by taking omeprazole for 7 to 14 days, the exact time is related to the type of gastritis. Gastritis is divided into acute gastritis and chronic gastritis, and chronic gastritis is further divided into chronic non-atrophic gastritis and chronic atrophic gastritis. Most acute gastritis and chronic non-atrophic gastritis resolve in 7 to 14 days. If chronic atrophic gastritis without erosion and bleeding, generally do not apply omeprazole, need to be combined with the use of drugs to promote gastric dynamics, such as domperidone and so on. The above drugs should be used in accordance with the doctor’s instructions, do not unauthorized indiscriminate use of drugs, to avoid the adverse effects of drugs. Gastritis is mostly caused by stress, H. pylori infection, drugs, trauma, autoimmunity and many other factors. Untimely treatment may worsen the symptoms such as abdominal pain, loss of appetite and even malignant changes, so you should go to the hospital in time, do gastroscopy and H. pylori and other related tests, and take the appropriate treatment.