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, severe chest, upper back, or abdominal pain, especially if tearing or spreading
Sudden breathlessness, collapse, fainting, or cold sweating
Sudden weakness, facial drooping, speech difficulty, or loss of coordination
Sudden chest pain with difficulty breathing, which may indicate a collapsed lung
Do not travel to hospital without emergency help if an aortic emergency is possible.
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 same-day eye care for sudden flashes of light, many new floaters, or a dark curtain or shadow across the vision.
These can be signs of retinal detachment.
3
Does any of this apply?
Book an appointment
Arrange routine follow-up if you have Marfan syndrome and develop new breathlessness, palpitations, reduced exercise tolerance, persistent back or joint pain, or changes in vision.
These symptoms do not always indicate a serious complication, but they may need assessment.
Every sign above is quoted from the sofidex article on Marfan syndrome. If you are not sure, err upward — it is always reasonable to be checked.