What are the symptoms of diabetes insipidus?

Peeing all the time! Diabetes insipidus (or di) is caused by either a lack of or a resistance to the hormone in your body (antidiuretic hormone) which normally allows your body to concentrate urine (so that you make less of it). Without this hormone, you produce large volumes or urine, and often patients present with excess thirst because they are on the verge of getting dehydrated from all the urine output.