Among the various etiologies of central diabetes insipidus, idiopathic diabetes insipidus comprises the largest group. We present a case of idiopathic diabetes insipidus with an antecedent viral syndrome. A 39-year-old Asian man presented with polyuria and polydipsia after a viral syndrome. A diagnosis of diabetes insipidus was established, and magnetic resonance imaging (MRI) of the brain demonstrated thickening of the pituitary stalk. Six months after his initial presentation, he was found to have hypogonadotropic hypogonadism while his other pituitary functions remained intact. A follow-up MRI scan 2 years after the onset of his symptoms revealed complete normalization of the size of the infundibular stalk. The etiology of the lesion is unknown but most likely represents an inflammatory response to a viral infection or an autoimmune process that resulted in “stalkitis.”