Peptic ulcer disease is caused by an imbalance between aggressive and defensive factors in the stomach and duodenum. The two most common causes are Helicobacter pylori infection, present in 70-80% of cases, and use of non-steroidal anti-inflammatory drugs. H. pylori infection triggers chronic inflammation and increases acid production, while NSAIDs inhibit protective prostaglandins. Stress, smoking, alcohol and certain medical conditions can also contribute to ulcer development by further disrupting the mucosal barrier. Peptic ulcers may be acute, caused by severe injury or illness, or chronic.
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