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
Seek emergency help for new difficulty breathing or swallowing, rapidly spreading severe weakness, fainting, chest pain, or signs of a severe allergic reaction such as facial swelling and breathing difficulty.
Seek emergency help immediately for these symptoms.
And for anyone, someone who:
has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
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 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
If you have already been diagnosed with MMN, contact your care team promptly if:
Weakness is clearly increasing or treatment benefits are wearing off earlier
has a new severe headache unlike any they have had before
3
Does any of this apply?
Book an appointment
Arrange a routine medical assessment if you develop gradually increasing weakness, particularly if it affects one hand, arm, foot, or leg more than the other.
Examples include repeated tripping, new foot drop, difficulty opening containers, or frequently dropping objects.
The article also says
Sudden facial weakness, speech difficulty, or one-sided weakness may be signs of a stroke rather than MMN.
Every sign above is quoted from the sofidex article on Multifocal motor neuropathy. If you are not sure, err upward — it is always reasonable to be checked.