Achlorhydria and hypochlorhydria are medical terms for low or very low volumes or a higher than normal pH of gastric acid.

Achlorhydria may refer to:

• a problem with the pH of gastric acid. In this case the pH of the gastric acid is too high resulting in it being less acidic or rarely, even slightly alkaline.
• a lower than normal  volume of the gastric acid.
• a lower than normal ratio of pepsinogen conversion, a digestive enzyme in the stomach that is eventually converted to pepsin by the gastric acid.

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