The most common sign of gastritis is a burning or gnawing pain in your upper abdomen, right below your breastbone. It often comes with nausea, a sense of uncomfortable fullness after eating, or both. Some people feel it as a dull ache that lingers for days; others experience a sharp flare that hits suddenly after a meal or a drink. Not everyone with gastritis has obvious symptoms, though. Chronic gastritis in particular can develop so gradually that you barely notice it until a doctor finds it during testing for something else.
What Gastritis Actually Feels Like
Gastritis is inflammation of your stomach lining. That inflammation can produce a handful of recognizable symptoms, though they vary in intensity from person to person. The hallmark is upper abdominal discomfort, usually centered just below the ribs. People describe it as burning, gnawing, or aching. It may get worse on an empty stomach, improve briefly after eating, or flare up after certain foods.
Beyond pain, gastritis commonly causes nausea (sometimes with vomiting), bloating, and a feeling of fullness that kicks in after just a few bites. Some people also experience loss of appetite or frequent belching. In milder cases, you might only notice vague indigestion that comes and goes. In more severe cases, especially erosive gastritis where the lining actually wears away, you can develop bleeding in the stomach.
Acute vs. Chronic Symptoms
Acute gastritis comes on suddenly and tends to be intense but short-lived. A night of heavy drinking, a bout of food poisoning, or a few days of taking anti-inflammatory painkillers can all trigger it. The pain is usually sharp, and nausea or vomiting may be prominent. If you remove the trigger, acute gastritis often resolves within days to a couple of weeks.
Chronic gastritis is a different experience. It develops gradually, often as a result of an ongoing condition like an H. pylori infection or an autoimmune process. The symptoms tend to be subtler: a low-grade ache, mild nausea, or just persistent indigestion you learn to live with. Some people with chronic gastritis feel nothing at all for long stretches. The concern with chronic gastritis is what happens over months and years. Left untreated, it can thin the stomach lining (atrophic gastritis), reduce your ability to absorb certain nutrients, and in rare cases increase the risk of stomach cancer.
Signs That Point to Something More Serious
Most gastritis is uncomfortable but not dangerous. However, certain symptoms signal bleeding in the stomach, which requires prompt medical attention:
- Black or tarry stools, or stools with red or maroon blood mixed in
- Vomiting blood or material that looks like dark coffee grounds
- Feeling lightheaded, short of breath, or unusually tired without an obvious explanation
These symptoms suggest the stomach lining has eroded enough to cause active bleeding. Even small amounts of blood loss over time can lead to anemia, so persistent fatigue and weakness are worth investigating.
How Gastritis Differs From Ulcers and Acid Reflux
Gastritis, peptic ulcers, and acid reflux (GERD) all cause upper abdominal pain and nausea, which is why they’re easy to confuse. Both gastritis and ulcers involve the stomach lining, but ulcers are actual open sores rather than general inflammation. One useful clue is the timing of pain. Ulcer pain often changes based on when you eat: a stomach ulcer may feel worse right after a meal, while a duodenal ulcer (in the upper small intestine) tends to hurt when your stomach is empty and improve after eating. Gastritis pain is less predictable in its relationship to meals.
Acid reflux, on the other hand, typically produces a burning sensation that rises up behind the breastbone into the throat, often worse when lying down or bending over. Gastritis pain stays lower, centered in the upper belly. That said, these conditions frequently coexist, and distinguishing between them based on symptoms alone is difficult. If your symptoms persist for more than a couple of weeks, testing is usually the next step.
How Gastritis Gets Diagnosed
You can suspect gastritis from your symptoms, but confirming it requires some form of testing. Doctors typically start by checking for H. pylori, the bacterium responsible for the majority of chronic gastritis cases. The most common non-invasive option is a urea breath test, where you drink a solution and then breathe into a collection bag. It’s about 92 to 94 percent accurate at detecting the infection. Stool antigen tests and blood antibody tests are also available, though they’re slightly less precise.
If your symptoms are severe, recurrent, or don’t respond to initial treatment, your doctor may recommend an upper endoscopy. This involves passing a thin, flexible camera through your mouth into your stomach. The procedure takes about 15 to 20 minutes, is done under sedation, and lets the doctor visually inspect the stomach lining for redness, swelling, or erosions. Small tissue samples can be taken during the same procedure to check for H. pylori, confirm the type of gastritis, and rule out other conditions.
Blood tests can also play a role. If your doctor suspects chronic atrophic gastritis, they may check your vitamin B12 levels and markers of anemia. A specific form called autoimmune atrophic gastritis destroys cells that produce a protein needed to absorb B12. Over time, this leads to B12 deficiency, which can cause fatigue, weakness, and eventually neurological symptoms like numbness or tingling in the hands and feet, or difficulty with balance.
Common Triggers and Risk Factors
Knowing what causes gastritis can help you figure out whether your symptoms fit the pattern. The most common culprits are:
- H. pylori infection: This bacterium lives in the stomach lining and is the leading cause of chronic gastritis worldwide. Many people carry it without symptoms, but in others it triggers persistent inflammation.
- Anti-inflammatory painkillers: Regular use of ibuprofen, aspirin, or naproxen weakens the protective mucus barrier in your stomach. Even short-term use at high doses can cause acute erosive gastritis.
- Alcohol: Heavy or frequent drinking directly irritates and erodes the stomach lining. A single episode of binge drinking can trigger acute gastritis; ongoing heavy use can lead to chronic damage.
- Stress from severe illness: Major surgery, critical illness, burns, or traumatic injury can cause stress-related gastritis. This is a different mechanism from everyday psychological stress, though chronic emotional stress may worsen existing inflammation.
- Autoimmune response: In some people, the immune system attacks the stomach’s own lining cells. This is more common in people with other autoimmune conditions like type 1 diabetes or thyroid disease.
What to Expect if You’re Diagnosed
If H. pylori is the cause, treatment involves a combination of antibiotics and acid-reducing medication taken over about two weeks. Most people clear the infection successfully. After treatment, your doctor will likely retest to confirm the bacteria are gone, usually with another breath test or stool test.
If painkillers are the trigger, the main step is stopping or reducing the medication and switching to alternatives that are easier on the stomach. Acid-suppressing medications can help the lining heal in the meantime. Most cases of acute gastritis from painkillers or alcohol improve within a few weeks once the irritant is removed.
For autoimmune gastritis, there’s no way to stop the immune attack on the stomach lining, but the consequences are manageable. Regular B12 monitoring and supplementation (often through injections, since the stomach can’t absorb it normally) prevent the anemia and nerve damage that would otherwise develop. Periodic endoscopy may be recommended to watch for changes in the stomach lining over time.
Dietary adjustments can help ease symptoms regardless of the cause. Spicy foods, acidic foods, and caffeine don’t cause gastritis, but they can aggravate an already inflamed stomach. Eating smaller, more frequent meals and avoiding eating close to bedtime are practical steps that reduce discomfort while your stomach heals.