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 sudden shaking accompanied by facial drooping, one-sided weakness or numbness, trouble speaking, severe loss of balance, confusion, seizure, or a sudden severe headache.
These symptoms may indicate a stroke or another emergency rather than a chronic tremor condition.
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 if a new tremor develops soon after starting or increasing a medicine and is accompanied by fever, marked agitation, muscle rigidity, vomiting, or a very fast heartbeat.
3
Does any of this apply?
Book an appointment
Arrange a routine medical appointment if a tremor:
Persists, worsens, or begins affecting daily activities
Starts after a medicine change
Interferes with eating, drinking, writing, work, or sleep
Occurs with stiffness, slowing, balance problems, or unusual movements
Has not previously been assessed
Every sign above is quoted from the sofidex article on Presenile tremor syndrome. If you are not sure, err upward — it is always reasonable to be checked.