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
Seek urgent or emergency help for:
A first seizure or a seizure lasting longer than usual
Sudden weakness, facial drooping, speech difficulty, or loss of vision
Loss of consciousness or severe confusion
A sudden, extremely severe headache
Repeated vomiting with worsening headache or drowsiness
Heavy rectal bleeding, black stools, fainting, or marked dizziness
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
These symptoms can have causes other than glioma-polyposis syndrome, but they need prompt assessment.
3
Does any of this apply?
Book an appointment
Arrange a routine medical assessment for persistent bowel bleeding, a lasting change in bowel habits, unexplained anemia, repeated headaches, new balance problems, or gradual changes in memory, behavior, speech, or vision.
The article also says
Medical review is also appropriate if close relatives have had numerous bowel polyps, colorectal cancer at a young age, brain tumors, or a known APC or mismatch-repair gene change.
This does not mean that you have the condition, but it may justify a detailed family-history assessment.
Every sign above is quoted from the sofidex article on Glioma-polyposis syndrome. If you are not sure, err upward — it is always reasonable to be checked.