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 symptoms that could mean sudden loss of blood flow, major bleeding, stroke, or heart injury.
These include:
Sudden, severe, or rapidly worsening abdominal, chest, or back pain
Vomiting blood, passing black stools, or heavy rectal bleeding
A drooping face, new one-sided weakness, speech difficulty, or confusion
Fainting, severe breathlessness, or crushing chest pressure
A limb that suddenly becomes very painful, cold, pale, or weak
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 advice for new nerve weakness, worsening abdominal pain after meals, a rapidly spreading skin ulcer, much less urine than usual, or a severe headache with very high blood pressure.
If you take immune-suppressing medicine, seek prompt advice for fever or other signs of infection.
The medicine may reduce your body's usual response to infection.
3
Does any of this apply?
Book an appointment
Routine follow-up is the right place to discuss gradual tiredness, stable nerve pain, recovery, work, exercise, vaccination, pregnancy planning, or ongoing medicine side effects.
Do not stop corticosteroids or other immune-suppressing medicines suddenly unless you have been told to do so.
Every sign above is quoted from the sofidex article on Polyarteritis nodosa. If you are not sure, err upward — it is always reasonable to be checked.