What are the signs and symptoms of diabetes insipidus? 

A symptom is something the patient senses and describes, while a sign is something other people, such as the doctor notice. For example, drowsiness may be a symptom while dilated pupils may be a sign. 

The main signs and symptoms of diabetes insipidus include:

Extreme thirst - patients find themselves having to drink water all the time. The constant thirst and a dry feeling are persistent; even after consuming large quantities of water.

Polyuria - excretion of very large quantities of urine (diluted). Urine output can range from 2.5 liters (2.6 quarts) per day to 15 liters (16 quarts) per day, compared to about 1.5 to 2.5 liters per day in other adults without the condition. 

Patients may find that they need to pass pale, watery urine as often as every 15 to 20 minutes. This may make it very hard to be out of the house if there is no toilet nearby. In the UK patients may receive a toilet facility card which allows them to use toilets in non-public places.

The following signs and symptoms are also possible:

Nocturia - having to get up from sleep to urinate. Disrupted sleeping patterns can lead to fatigue (tiredness, irritability, and concentration problems.

Enuresis - bed-wetting

Feeling unwell - patients commonly feel run down for much of the time.

The following signs and symptoms may be present among young children with diabetes insipidus:

Cool hands and feet

Delayed growth (failure to thrive)

Diapers (UK: nappies) which are excessively wet

Diarrhea

Dry skin

Fever

Inconsolable crying

Unexplained fussiness

Vomiting

Weight loss (failure to thrive)

Anybody who has excessive thirst and urination should see their doctor as soon as possible.