A 40-year-old woman presented to the Outpatient Department with complaints of frequent urination and excessive thirst for 3 months. She was passing large volumes of urine throughout the day and night, but she denied dysuria, urgency, or hesitancy. She used to consume 2 cups of tea in a day. Twenty-four-hour urine output was 6 L, with corresponding increase in fluid intake. There was no relevant medical history, except for the frequent use of proton pump inhibitors and laxatives for pain epigastrium and constipation, respectively.