Pulmonary tuberculosis in an adult presenting with severe hyponatremia: A case report and review of literature.

Key Clinical Message: Identifying pulmonary pathology while evaluating electrolyte disorders is crucial for optimal patient management. Physicians working in endemic regions of tuberculosis should consider this pathology as a differential for electrolyte imbalances. Abstract: Hyponatremia, a common electrolyte imbalance, can arise from various underlying etiologies such as diuretics, diarrhea, vomiting, congestive heart failure, and liver and renal disease. We present a case report of a 74-year-old man highlighting the association between pulmonary tuberculosis (TB) and the development of hyponatremia. GeneXpert assay of the patient's sputum sample led to the identification of underlying active pulmonary TB as the cause of hyponatremia. The patient was started on anti-TB therapy, and concurrent fluid restriction and sodium supplementation were initiated to correct the electrolyte imbalance. Over the next 3 days, the patient demonstrated clinical improvement with the resolution of hyponatremia. This case also highlights the importance of considering TB as a potential etiology in patients presenting with hyponatremia, especially in endemic areas. Further research is warranted to explore the mechanistic pathways linking pulmonary TB and hyponatremia, aiding in the development of targeted therapeutic interventions.