Hyperchlorhydria: Excess Stomach Acid – Causes, Symptoms & Treatment

Hyperchlorhydria denotes excessive secretion of hydrochloric acid (HCl) by gastric parietal cells, resulting in abnormally low intragastric pH (<1.5–2).

Causes

• Gastrin hypersecretion: Gastrinoma (Zollinger-Ellison syndrome), retained antrum, G-cell hyperplasia.
• Loss of inhibitory control: H. pylori (initially ↑ gastrin via somatostatin inhibition), vagal overactivity.
• Drug-induced: Chronic PPI withdrawal (rebound hypersecretion), corticosteroids.
• Physiologic: Young adults, high-protein meals, stress.

Symptoms

• Heartburn, acid regurgitation, epigastric pain (worse fasting/night).
• Dyspepsia, nausea, early satiety.
• Complications: peptic ulcers (duodenal > gastric), erosive esophagitis, Barrett's esophagus, gastric outlet obstruction.

Diagnosis

• Gastric pH monitoring (nasogastric tube, wireless capsule) – pH <1.5 fasting.
• Serum gastrin – Elevated in ZES (>1000 pg/mL), H. pylori, PPI use.
• Endoscopy – Ulcers, hypertrophic folds, Barrett's.
• Secretin stimulation test – Gold standard for gastrinoma.

Treatment

• PPIs (omeprazole, esomeprazole, etc.) – Potent acid suppression; high-dose for ZES.
• H. pylori eradication if present (triple/quadruple therapy).
• Somatostatin analogs (octreotide) – For ZES refractory to PPIs.
• Surgery – Tumor resection (gastrinoma); highly selective vagotomy (historical).
• Lifestyle: Small frequent meals, avoid triggers (caffeine, alcohol, spicy, fatty), elevate head of bed.