Gastritis occurs when the lining of the stomach becomes inflamed or swollen.
Gastritis can last for only a short time (acute gastritis). It may also linger for months to years (chronic gastritis).
The most common causes of gastritis are:
Less common causes are:
Trauma or a severe, sudden illness such as major surgery, kidney failure, or being placed on a breathing machine may cause gastritis.
Many people with gastritis do not have any symptoms.
Symptoms you may notice are:
If gastritis is causing bleeding from the lining of the stomach, symptoms may include:
Tests that may be needed are:
Treatment depends on what is causing the problem. Some of the causes will go away over time.
You may need to stop taking aspirin, ibuprofen, naproxen, or other medicines that may be causing gastritis. Always talk to your health care provider before stopping any medicine.
You may use other over-the-counter and prescription drugs that decrease the amount of acid in the stomach, such as:
Antibiotics may be used to treat chronic gastritis caused by infection with Helicobacter pylori bacteria.
The outlook depends on the cause, but is often very good.
Blood loss and increased risk for gastric cancer can occur.
Call your provider if you develop:
Avoid long-term use of substances that can irritate your stomach such as aspirin, anti-inflammatory drugs, or alcohol.
Feldman M, Jensen PJ, Howden CW. Gastritis and gastropathy. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease. 11th ed. Philadelphia, PA: Elsevier; 2021:chap 52.
Kuipers EJ. Acid peptic disease. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 130.
Reviewed By: Michael M. Phillips, MD, Emeritus Professor of Medicine, The George Washington University School of Medicine, Washington, DC. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.