Unusually large urine volumes may point to:

1. Two named conditions both cause it. 2. One is mellitus and one is insipidus. 3. Unusually large quantities of urine may point to diseases like diabetes mellitus or diabetes insipidus. 4. So the answer is diabetes. _Source: OpenStax 'Anatomy and Physiology 2e', Ch 25 'The Urinary System'_