Cause of seizures: Lungs, not the brain

Hyponatremia is a common electrolyte abnormality but is usually asymptomatic and is often neglected. We present case of a 22-year-old diabetic male who presented with generalized tonic clonic seizures which was later found to be a consequence of hyponatremia. Further investigation unravels the presence of SIADH which was eventually found to be due to the consolidation of the left lingual lobe of lung. This case emphasizes the need for a thorough workup to identify the etiology of hyponatremia as it may unmask a treatable entity.