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 walking suddenly becomes difficult and you also have facial drooping, one-sided weakness or numbness, trouble speaking, confusion, loss of vision, or a severe new headache.
These can be signs of a stroke, even if they improve quickly.
Emergency assessment is also needed for:
New leg weakness with loss of bladder or bowel control
Numbness around the genitals, buttocks, or inner thighs
Inability to stand after a serious head, neck, back, hip, or leg injury
Sudden severe loss of balance with other new neurological symptoms
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 care if you suddenly cannot put weight on a leg, your walking is rapidly worsening, or you have a painful hot or swollen joint with fever.
A child with a new limp, fever, or refusal to walk also needs prompt assessment.
3
Does any of this apply?
Book an appointment
Book a routine appointment if the change lasts, keeps returning, causes falls, or limits daily activities.
Gradual walking changes should not simply be assumed to be part of aging.
Every sign above is quoted from the sofidex article on Walking abnormalities. If you are not sure, err upward — it is always reasonable to be checked.