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
Follow the person’s established emergency plan if one is available.
Get urgent or emergency help for:
Severe sleepiness, confusion, or difficulty waking
A seizure, collapse, or loss of consciousness
Symptoms of severe low blood sugar
Repeated vomiting with inability to keep fluids down
Yellow skin or eyes, unusual bleeding, or a swollen abdomen
Signs of serious dehydration, such as very little urine
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 HFI has been diagnosed, seek prompt advice after a meaningful accidental exposure, particularly if vomiting, abdominal pain, weakness, or unusual behaviour develops.
And for anyone, someone who:
has a wound that is hot, spreading red, or leaking pus
3
Does any of this apply?
Book an appointment
Arrange routine medical review if you or your child has repeated vomiting, sweating, weakness, or unusual sleepiness after sweet foods.
Poor growth, persistent food refusal, or a strong pattern of avoiding sweets also deserves assessment, especially when HFI is present in the family.
The article also says
Do not deliberately give fructose to test whether symptoms occur.
A suspected exposure should be managed based on symptoms and the person’s medical plan.
Every sign above is quoted from the sofidex article on Hereditary fructose intolerance. If you are not sure, err upward — it is always reasonable to be checked.