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Achlorhydria or hypochlorhydria refers to states where the production of hydrochloric acid in gastric secretions of the stomach and other digestive organs is absent or low, respectively.〔Kohli, Divyanshoo R., Jennifer Lee, and Timothy R. Koch. "Achlorhydria." Medscape. Ed. B S. Anand. N.p., 29 Apr. 2015. Web. 25 May 2015.〕 It is associated with various other medical problems. ==Signs and symptoms== Irrespective of the cause, achlorhydria can result as known complications of bacterial overgrowth and intestinal metaplasia and symptoms are often consistent with those diseases: *gastroesophageal reflux disease *abdominal discomfort *early satiety *weight loss *diarrhea *constipation *abdominal bloating Since acidic pH facilitates the absorption of iron, achlorhydric patients often develop iron deficiency anemia. Bacterial overgrowth and B12 deficiency (pernicious anemia) can cause micronutrient deficiencies that result in various clinical neurological manifestations, including visual changes, paresthesias, ataxia, limb weakness, gait disturbance, memory defects, hallucinations and personality and mood changes. Risk of particular infections, such as ''Vibrio vulnificus'' (commonly from seafood) is increased. Even without bacterial overgrowth, low stomach acid (high pH) can lead to nutritional deficiencies through decreased absorption of basic electrolytes (magnesium, zinc, etc.) and vitamins (including vitamin C, vitamin K, and the B complex of vitamins). Such deficiencies may be involved in the development of a wide range of pathologies, from fairly benign neuromuscular issues to life-threatening diseases. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「achlorhydria」の詳細全文を読む スポンサード リンク
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