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
Call emergency services for sudden facial weakness, arm weakness, difficulty speaking, loss of coordination, a seizure, or a sudden severe headache.
These symptoms have many possible causes, but they require immediate assessment.
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
Seek urgent medical help for:
A nosebleed that is heavy or does not stop after sustained firm pressure
Vomiting blood or passing black, tar-like stools
Bleeding accompanied by faintness, marked weakness, or breathlessness
New severe shortness of breath, chest pain, or coughing up blood
3
Does any of this apply?
Book an appointment
Arrange a routine appointment if the vessels are new, spreading, repeatedly bleeding, or associated with pain, leg swelling, skin thickening, unusual fatigue, or other new symptoms.
Assessment is also reasonable if you have frequent unexplained nosebleeds or close relatives with HHT.
Every sign above is quoted from the sofidex article on Telangiectasia. If you are not sure, err upward — it is always reasonable to be checked.