What are the three major types of chronic gastritis?

Chronic gastritis—including superficial gastritis, atrophic gastritis, and erosive gastritis—is commonly associated with excessive gastric acid secretion, bacterial infection (e.g., *Helicobacter pylori*), and irritants such as spicy foods or alcohol, all of which can damage the gastric mucosa. Symptoms often include epigastric pain, heartburn, nausea, and loss of appetite. For definitive diagnosis, a gastroscopy examination by a gastroenterologist is recommended. Treatment may include anti-inflammatory agents, digestive aids, gastric mucosal protectants, and acid-suppressing medications (e.g., proton pump inhibitors or H₂-receptor antagonists). Smoking and alcohol consumption should be strictly avoided.