Hyperchlorhydria is the excessive secretion of gastric acid — the stomach producing more hydrochloric acid than normal, lowering its pH beyond the usual 1.5–3.5 range. Sufferers experience burning epigastric pain, sour reflux, and nausea, often worse on an empty stomach. Causes include gastrin-secreting tumours (Zollinger-Ellison syndrome), H. pylori infection patterns, and rebound after stopping acid suppressants. Diagnosis measures acid output directly or infers it from symptoms and endoscopy; treatment suppresses the excess with proton pump inhibitors or H2 blockers while addressing the cause. The stomach’s acid is essential for digestion and defence — hyperchlorhydria is that defence turned excessive, the organ attacking the comfort of its owner.