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 if movement changes begin suddenly with any of these symptoms:
Weakness or numbness on one side
A drooping face or difficulty speaking
Severe confusion, collapse, or loss of consciousness
A seizure that does not stop, or repeated seizures without recovery
Trouble breathing or swallowing
Severe headache, especially after a head injury
These signs can indicate a stroke, seizure emergency, serious injury, or another condition requiring immediate assessment.
Do not drive yourself.
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 same-day medical advice for a new movement problem that is rapidly worsening, started after a new medicine or dose change, or occurs with fever, marked stiffness, agitation, or unusual sleepiness.
3
Does any of this apply?
Book an appointment
Arrange a routine appointment if the movement lasts, keeps returning, becomes more noticeable, or interferes with eating, writing, walking, work, sleep, or personal care.
You should also book an appointment if slow movement is accompanied by ongoing stiffness, balance problems, or falls.
Every sign above is quoted from the sofidex article on Movement - uncontrolled or slow. If you are not sure, err upward — it is always reasonable to be checked.