Case Report: Chronic Hyponatremia Secondary to SIADH in an Older Adult
Abstract Syndrome of Inappropriate Antidiuretic Hormone Secretion (SIADH) is a well-recognized cause of chronic hyponatremia, particularly in older adults. Management focuses on identifying the underlying etiology and preventing rapid or severe sodium decline. We report a case of long-standing SIADH with fluctuating sodium levels, managed conservatively with increased oral sodium intake and close laboratory monitoring, highlighting the challenges of unexplained sodium variability and patient-centered self-management. Introduction SIADH is characterized by inappropriate secretion of antidiuretic hormone resulting in impaired free water excretion and dilutional hyponatremia. Chronic hyponatremia may remain asymptomatic but carries risks of neurological complications when sodium levels decline rapidly or fall below critical thresholds. Individualized management is essential, particularly in older patients. Case Presentation A 73-year-old individual with a known diagnosis of SIADH pr...