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 care for:
Sudden or rapidly worsening leg weakness
New loss of bladder or bowel control
Inability to urinate
New numbness in the saddle area around the genitals or inner thighs
Severe back pain with fever, confusion, severe headache, or neck stiffness
Major new neurologic symptoms after a spinal procedure
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
Contact the treating clinician promptly for steadily increasing pain, new numbness, worsening balance, repeated falls, new urinary difficulty, or a clear decline in strength.
These concerns are different from a stable symptom flare and may need a new examination.
3
Does any of this apply?
Book an appointment
Routine follow-up may involve a primary care clinician and one or more specialists, such as a neurologist, rehabilitation physician, pain specialist, urologist, or spine surgeon.
Visits may review pain, strength, walking, falls, bladder and bowel function, medication effects, sleep, and the ability to manage daily activities.
The article also says
Repeat MRI is not automatically needed at every visit.
It is more likely to be considered when symptoms change, neurologic function declines, or a clinician is evaluating a possible complication or surgical option.
Every sign above is quoted from the sofidex article on Arachnitis. If you are not sure, err upward — it is always reasonable to be checked.