Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
A seizure, collapse or severe reduction in consciousness is an emergency.
Call your local emergency service.
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
Someone who you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
If you have already been diagnosed, seek prompt advice if symptoms change, you cannot take your usual medicine, or vomiting or diarrhoea prevents normal drinking.
Children, older adults and people with impaired thirst may dehydrate more quickly.
Get urgent medical help for:
New confusion or unusual difficulty staying awake
Inability to drink or keep fluids down
Severe weakness, fainting or marked dizziness
A severe or worsening headache with nausea after desmopressin
Muscle twitching or a seizure
3
Does any of this apply?
Book an appointment
Arrange a routine appointment if you have persistent intense thirst, regularly pass large amounts of pale urine or repeatedly wake to urinate.
These symptoms require assessment but do not confirm diabetes insipidus.
Every sign above is quoted from the sofidex article on Diabetes insipidus. If you are not sure, err upward — it is always reasonable to be checked.