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 after a major injury if the joint looks deformed, a bone may be broken, or the limb below the injury is numb, unusually pale, blue, or cold.
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
Arrange same-day medical assessment if:
A joint suddenly becomes very painful, hot, swollen, or red
Joint pain occurs with fever, chills, or feeling significantly unwell
A joint swells quickly without a clear minor injury
You cannot use the joint or put weight on it
Sudden swelling occurs while you take blood-thinning medicine
These symptoms may need testing and treatment without delay.
Do not drive yourself if pain or reduced movement makes driving unsafe.
And for anyone, someone who:
has abdominal pain that is severe, constant, or getting worse
3
Does any of this apply?
Book an appointment
For routine care, book an appointment if pain lasts longer than about two weeks, keeps returning, disturbs sleep, or limits work and daily activities.
You should also arrange a review for ongoing swelling, prolonged morning stiffness, unexplained weight loss, or pain in several joints.
Every sign above is quoted from the sofidex article on Joint pain. If you are not sure, err upward — it is always reasonable to be checked.