What Is Chronic Gastritis?
Chronic gastritis is defined as histologically documented chronic inflammation of the gastric mucosa — that is, confirmed by biopsy. It is essential to distinguish gastritis (a histologic diagnosis) from dyspepsia (clinical symptoms), since many patients with gastritis are asymptomatic and many with dyspeptic symptoms do not have gastritis.
The most common cause is Helicobacter pylori infection, responsible for more than 80% of cases of chronic gastritis worldwide. Other causes include autoimmune gastritis, chemical gastritis (NSAIDs, bile), and rarer forms such as lymphocytic and granulomatous gastritis.
Chronic gastritis matters mainly for its potential to progress to gastric atrophy, intestinal metaplasia, and, in a minority of cases, gastric adenocarcinoma — the so-called Correa cascade.
Histologic Diagnosis
Gastritis is a diagnosis that requires biopsy. Endoscopy can suggest, but does not confirm. Many gastritides are microscopic — a normal endoscopy does not rule it out.
H. pylori Predominant
H. pylori infection causes more than 80% of cases worldwide. Eradication is the main treatment and prevents progression to atrophy and cancer.
Correa Cascade
Chronic gastritis can progress: inflammation -> atrophy -> intestinal metaplasia -> dysplasia -> adenocarcinoma. Early eradication of H. pylori interrupts this cascade.
Pathophysiology
In H. pylori gastritis, the bacterium colonizes the gastric mucus layer and adheres to epithelial cells, triggering a chronic inflammatory response. H. pylori produces urease (which neutralizes local acid), cytotoxins (CagA, VacA), and enzymes that injure the mucosa, generating an inflammatory infiltrate of neutrophils and lymphocytes.
Autoimmune gastritis is caused by antibodies against parietal cells and against intrinsic factor, resulting in progressive destruction of the oxyntic glands of the gastric body. This leads to achlorhydria (absence of acid production), intrinsic factor deficiency, and pernicious anemia from vitamin B12 malabsorption.
TYPES OF CHRONIC GASTRITIS
| FEATURE | H. PYLORI GASTRITIS | AUTOIMMUNE GASTRITIS | CHEMICAL GASTRITIS |
|---|---|---|---|
| Cause | Bacterial infection | Anti-parietal cell autoantibodies | NSAIDs, bile, alcohol |
| Location | Antrum -> pangastritis | Body and fundus | Antrum (reactive) |
| Cancer risk | Increased (6-8x) | Increased (3-5x) | Minimal |
| B12 deficiency | Rare | Frequent (pernicious anemia) | Absent |
| Main treatment | Eradication of H. pylori | B12 replacement, surveillance | Withdrawal of the offending agent |
Symptoms
Most patients with chronic gastritis are asymptomatic. When present, symptoms are nonspecific and overlap with those of functional dyspepsia. The correlation between histologic severity and clinical symptoms is weak.
Possible Symptoms of Chronic Gastritis
- 01
Epigastric pain or burning
Discomfort in the stomach region, usually mild to moderate. May worsen on an empty stomach or after meals.
- 02
Postprandial fullness
Sensation of a full stomach after normal meals, similar to functional dyspepsia.
- 03
Nausea
Mild and intermittent nausea, usually without significant vomiting.
- 04
Anemia
In autoimmune gastritis: megaloblastic anemia from B12 deficiency. In erosive gastritis: iron-deficiency anemia from chronic loss.
- 05
Neurologic manifestations
In advanced autoimmune gastritis: paresthesias, ataxia, and dementia from B12 deficiency (subacute combined degeneration).
- 06
Asymptomatic
Most patients with chronic gastritis have no symptoms. Diagnosis is often incidental on endoscopy performed for other reasons.
Diagnosis
Definitive diagnosis requires endoscopy with biopsies following the updated Sydney protocol — biopsies from the antrum (2), body (2), and incisura angularis (1). This allows classification of the type, intensity, and extent of inflammation, in addition to identifying atrophy, metaplasia, and H. pylori.
To diagnose H. pylori infection in isolation, noninvasive tests such as the urea breath test and stool antigen are validated alternatives. Anti-H. pylori serology does not distinguish active from past infection.
🏥Workup for Chronic Gastritis
- 1.Upper endoscopy with protocol biopsies (updated Sydney)
- 2.H. pylori testing: histology, rapid urease test, breath test, or stool antigen
- 3.Complete blood count (megaloblastic or iron-deficiency anemia)
- 4.Vitamin B12 and folate levels (autoimmune gastritis)
- 5.Anti-parietal cell and anti-intrinsic factor antibodies (autoimmune gastritis)
- 6.Serum gastrin (elevated in body atrophy — reactive hypergastrinemia)
DIAGNÓSTICO DIFERENCIAL
Differential Diagnosis
Peptic Ulcer
- More localized and intense epigastric pain
- Different food pattern (duodenal ulcer: worsens on an empty stomach)
Testes Diagnósticos
- Endoscopy with biopsy
- H. pylori testing
Gastric Cancer
- Persistent gastritis after treatment
- Weight loss
- Anemia
- Persistence > 8 weeks = endoscopy
Testes Diagnósticos
- Endoscopy with biopsy
GERD
Read more →- Predominant heartburn
- Regurgitation
- Improves when sitting up
Testes Diagnósticos
- Endoscopy
- pH monitoring
Celiac Disease
- Pain + diarrhea + malabsorption
- Anti-tTG IgA positive
Testes Diagnósticos
- Celiac serology
- Duodenal biopsy
Autoimmune Gastritis
- Anti-parietal cell antibodies
- Pernicious anemia
- B12 deficiency
Testes Diagnósticos
- Anti-PCA
- Vitamin B12
Peptic Ulcer and Gastric Cancer: Serious Conditions That Require Endoscopy
Peptic ulcer and chronic gastritis share postprandial epigastric pain, but ulcer pain tends to be more localized and intense, with a characteristic time pattern — duodenal ulcer worsens on an empty stomach (improves with food) and gastric ulcer worsens with eating. Upper endoscopy is the only test that definitively distinguishes gastritis from ulcer, and it allows biopsy for H. pylori testing and exclusion of malignancy in gastric ulcers.
Gastric cancer can be the underlying cause of "refractory gastritis." Gastritis that persists or worsens after adequate treatment, especially with weight loss, anemia, early satiety, or dysphagia, should prompt urgent endoscopy with multiple biopsies. Japan and South Korea, with high gastric cancer prevalence, perform population endoscopic screening — in lower-prevalence regions, endoscopy is indicated when alarm signs are present or symptoms persist after age 45.
Autoimmune Gastritis: The Rare Cause of Severe Anemia
Autoimmune gastritis is caused by autoantibodies against gastric parietal cells and intrinsic factor, leading to progressive destruction of the fundic mucosa, achlorhydria, and vitamin B12 deficiency (through impaired intrinsic factor-dependent absorption). Pernicious anemia — severe macrocytic anemia — is the most serious complication. Neurologic manifestations from B12 deficiency (subacute combined degeneration of the spinal cord) may precede the anemia.
Testing for anti-parietal cell and anti-intrinsic factor antibodies, combined with measurement of vitamin B12, serum gastrin (typically elevated in autoimmune gastritis due to achlorhydria), and chromogranin A guides diagnosis. Autoimmune gastritis increases the risk of intestinal-type gastric cancer and gastric neuroendocrine tumors — requiring periodic endoscopic surveillance. Treatment is parenteral B12 replacement.
GERD and Celiac Disease: Frequent Diagnostic Overlap
GERD frequently coexists with chronic gastritis — gastric inflammation can compromise lower esophageal sphincter tone and gastric emptying, favoring reflux. Predominant symptoms guide the distinction: retrosternal heartburn and regurgitation suggest GERD; diffuse epigastric pain and bloating suggest gastritis. Endoscopy and esophageal pH monitoring allow simultaneous evaluation of both conditions.
Celiac disease can produce lymphocytic gastritis, beyond its classic intestinal symptoms. In patients with gastritis refractory to treatment, especially with diarrhea, iron-deficiency anemia, or short stature, anti-tTG IgA antibody testing is recommended. Duodenal biopsy during upper endoscopy confirms celiac villous atrophy while the stomach is being evaluated. A celiac disease diagnosis completely changes treatment.
Treatment
Treatment of chronic gastritis depends on the cause. In H. pylori gastritis, treatment consists of eradication of the bacterium with triple therapy (PPI + clarithromycin + amoxicillin) or quadruple therapy (PPI + bismuth + metronidazole + tetracycline) for 14 days.
In autoimmune gastritis, there is no curative treatment. Management includes vitamin B12 replacement (parenteral in pernicious anemia), iron replacement if necessary, and endoscopic surveillance for early detection of dysplasia or carcinoid tumors.
In chemical gastritis, withdrawal or substitution of the offending agent (NSAIDs) is the fundamental step. PPIs can be used as gastric protection when NSAID use cannot be discontinued.
H. pylori Eradication
Triple therapy (PPI + clarithromycin + amoxicillin) for 14 days. Confirm eradication with breath test or stool antigen 4 weeks after completion.
Management of Autoimmune Gastritis
Monthly intramuscular vitamin B12 replacement, CBC monitoring, and surveillance endoscopy every 3 years for dysplasia screening.
Chemical Gastritis
Discontinue or substitute NSAIDs, add a PPI for gastric protection when NSAIDs are indispensable, and treat bile reflux if present.
Endoscopic Surveillance
Patients with extensive atrophy or intestinal metaplasia: endoscopy with biopsies every 3 years. Low-grade dysplasia: every 12 months. High-grade dysplasia: endoscopic resection.
Acupuncture as Treatment
Acupuncture can be used as complementary therapy in chronic gastritis, especially to relieve associated dyspeptic symptoms. Proposed mechanisms — still under investigation — include possible modulation of gastric acid secretion, mucosal inflammation, gastric motility, and visceral hypersensitivity.
Experimental studies in animal models suggest that acupuncture can reduce gastric mucosal inflammation and promote tissue repair, possibly by regulating inflammatory cytokines and growth factors. In humans, acupuncture as an adjuvant to pharmacotherapy has shown improvement in dyspeptic symptoms.
Importantly, acupuncture does not replace H. pylori eradication or specific treatment of the underlying cause. Its role is complementary, supporting symptom control and quality of life.
Prognosis
Prognosis depends on the type and extent of gastritis. After successful H. pylori eradication, inflammation regresses and gastric cancer risk decreases significantly, especially if treatment occurs before atrophy and metaplasia develop.
Patients with extensive atrophy and intestinal metaplasia have an increased risk of gastric adenocarcinoma (incidence of 0.5-1% over 5 years) and require endoscopic surveillance. Patients with autoimmune gastritis have an additional risk of gastric body carcinoid tumors.
Chemical gastritis from NSAIDs has an excellent prognosis after withdrawal of the offending agent. The gastric mucosa has great regenerative capacity, and healing occurs within a few weeks of stopping anti-inflammatories.
Myths and Facts
Myth vs. Fact
Gastritis is diagnosed when the patient feels stomach pain
Gastritis is a histologic diagnosis — it requires biopsy. Epigastric pain without biopsy is correctly called dyspepsia. Many "gastritides" treated in practice are, in fact, functional dyspepsia.
Spicy food causes gastritis
There is no evidence that spicy foods cause gastritis. The main cause is H. pylori, followed by NSAIDs and autoimmune causes. Foods may trigger symptoms but do not cause chronic inflammation.
"Nervous gastritis" exists
"Nervous gastritis" is not a recognized medical diagnosis. Patients with stress-related dyspeptic symptoms most likely have functional dyspepsia — a disorder of the gut-brain interaction, not gastric inflammation.
Everyone with H. pylori needs treatment
Guidelines recommend eradication in patients with ulcer, MALT lymphoma, atrophic gastritis, after resection of early gastric cancer, and in first-degree relatives of patients with gastric cancer. Indication is debated in asymptomatic patients without these factors.
Taking omeprazole daily treats gastritis
PPIs reduce acidity but do not treat the cause. In H. pylori gastritis, bacterial eradication is the treatment. In autoimmune gastritis, no curative treatment exists. PPIs without addressing the cause merely mask symptoms.
When to Seek Help
Occasional dyspeptic symptoms are common and generally do not require investigation. However, certain situations require medical evaluation to rule out complications.
Frequently Asked Questions about Chronic Gastritis
Chronic gastritis is persistent inflammation of the gastric mucosa, confirmed by endoscopic biopsy, that evolves over months to years. It differs from acute gastritis — transient inflammation usually caused by NSAIDs, alcohol, or infections — in its duration and in its potential to cause gastric atrophy and intestinal metaplasia over time. The most common cause of chronic gastritis worldwide is Helicobacter pylori infection, present in 60-70% of cases.
No. Most people infected with H. pylori (about 70-80%) never develop symptoms — the bacterium coexists with the host for decades without causing clinically significant problems. The 20-30% who develop complications progress to peptic ulcer (10-15%), gastric cancer (1-3%), or MALT lymphoma (very rare). Asymptomatic infection should be treated when identified, since eradication reduces the risk of ulcer and gastric cancer.
There are invasive and noninvasive methods. Noninvasive: labeled urea breath test (noninvasive gold standard), H. pylori stool antigen, and serology (IgG — less specific, does not distinguish active from past infection). Invasive (via endoscopy): biopsy for rapid urease test (CLO test), histology, and culture. The physician chooses the method based on the indication for endoscopy: without an indication for endoscopy, breath test or stool antigen is preferred.
The most widely used regimen is triple therapy for 14 days: PPI (omeprazole 20-40 mg twice daily) + clarithromycin 500 mg twice daily + amoxicillin 1 g twice daily. In regions with high clarithromycin resistance (>15%), bismuth quadruple therapy is preferred: PPI + bismuth + metronidazole + tetracycline. Eradication should be confirmed with a breath test 4-6 weeks after treatment ends, at least 2 weeks after stopping the PPI.
Yes, but the risk depends on the type and extent of gastritis. The Correa sequence describes the progression: chronic gastritis -> gastric atrophy -> intestinal metaplasia -> dysplasia -> adenocarcinoma. Risk is greater in extensive (multifocal) atrophic gastritis and in autoimmune gastritis. H. pylori infection is a class I risk factor for gastric cancer (IARC). Patients with extensive atrophy or intestinal metaplasia require periodic endoscopic surveillance, defined by the gastroenterologist.
Intestinal metaplasia is replacement of gastric epithelium by intestinal-type epithelium — an adaptive response to chronic injury from H. pylori infection or bile reflux. It is a preneoplastic lesion and increases the risk of gastric adenocarcinoma, especially when extensive and of incomplete type. Endoscopic surveillance (gastric mapping biopsies with OLGA/OLGIM classification) allows risk stratification and planning of the reendoscopy interval.
Chronic psychological stress can aggravate dyspeptic symptoms and alter gastric motility and acid production, but it is not a direct cause of chronic gastritis (which requires histologic inflammation). The popular "nervous gastritis" does not correspond to a defined histologic entity — these patients frequently have functional dyspepsia or gastric visceral hypersensitivity. Severe acute stress (surgery, burns, ICU) can cause stress ulcers — a condition distinct from chronic gastritis.
Clinical studies — mostly from the Chinese literature, with variable methodologic quality — suggest improvement in epigastric pain, bloating, nausea, and quality of life in patients with chronic gastritis and functional dyspepsia. Proposed mechanisms, still under investigation, include modulation of gastric motility, visceral hypersensitivity, and acid secretion via the autonomic nervous system. Acupuncture serves as a complementary treatment — it does not replace H. pylori eradication when indicated. Treatment is conducted by a physician acupuncturist.
Foods that frequently aggravate symptoms: alcoholic beverages (directly irritate the mucosa), excess caffeine, spicy foods, very acidic foods (excess citrus), fried foods, and fatty foods. NSAIDs (ibuprofen, diclofenac, aspirin) are direct causes of chemical gastritis and should be avoided or used with gastric protection (PPI). There is no universal diet — a food diary to identify individual triggers is more effective than generic restrictions.
Consult a physician urgently if there is: vomiting blood (hematemesis) or dark "coffee-ground" material; black, foul-smelling stools (melena — upper gastrointestinal bleeding); intense dizziness with sudden pallor (bleeding); very intense epigastric pain that does not improve; or rapid weight loss with progressive worsening of symptoms. Even without urgency, symptoms persisting more than 4-8 weeks, anemia of unidentified cause, or new symptoms after age 45 justify endoscopy for adequate investigation.
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