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
Go to emergency care immediately for:
Blurred, reduced, or double vision
An eye that appears pushed forward
Difficulty moving an eye
Severe headache with vomiting, confusion, or unusual drowsiness
Neck stiffness, a seizure, fainting, or new weakness
Rapidly increasing facial or eye swelling
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 assessment for swelling or redness around an eye, significant eyelid swelling, pain when moving the eye, or a high fever with worsening facial symptoms.
These symptoms do not prove that a complication is present, but they need prompt examination.
3
Does any of this apply?
Book an appointment
Arrange routine medical advice if symptoms:
Last more than about 10 days without improvement
Improve and then clearly worsen
Are severe or keep returning
Continue for 12 weeks or longer
Affect sleep or everyday activities
Occur while your immune system is weakened
Every sign above is quoted from the sofidex article on Ethmoiditis. If you are not sure, err upward — it is always reasonable to be checked.