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 or go to an emergency department for:
A significant head injury, even if you initially feel well
A sudden severe headache, confusion, fainting, seizure, weakness, or trouble speaking
Heavy bleeding or bleeding that does not stop with firm pressure
Vomiting or coughing up blood, or passing black, tar-like stools
Severe abdominal pain or rapidly increasing swelling
Breathing difficulty or bleeding after a major injury
Tell emergency staff that you have factor X deficiency and show them your bleeding plan.
Use routine follow-up to review medicines, plan pregnancy, arrange dental work or surgery, and discuss increasingly frequent bleeding without emergency features.
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
Do not wait for visible bleeding after a significant head injury because bleeding inside the skull may not be obvious at first.
Contact your usual healthcare or bleeding-disorders team promptly for blood in the urine, a painful swollen joint, a suspected muscle bleed, unusually heavy periods, repeated nosebleeds, or increasing bruising.
Every sign above is quoted from the sofidex article on Factor X deficiency. If you are not sure, err upward — it is always reasonable to be checked.