Hyponatremia, defined as a serum sodium level less than 135 mg/mL, can be euvolemic, hypovolemic, or hypervolemic. Its presentation can be subtle or severe depending on whether the hyponatremia is acute or chronic. This case investigates a geriatric patient who suffered diarrhea and hyponatremia following a course of ferrous sulfate pills for anemia treatment. Given that ferrous sulfate pills usually result in constipation, this presentation was abnormal. Literature review and comparison to

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... r atypical situations resulted in the conclusion that the patient's diarrhea was likely a result of her Crohn's diagnosis. The subsequent resulting hyponatremia was likely due to this diarrhea coupled with her prescription thiazide diuretic which can cause hyponatremia as a common side effect. This report allows for physicians to understand potential causes behind atypical electrolyte abnormalities in their patients and hence, find an effective treatment plan.