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 shoulder or arm pain occurs with chest pressure, shortness of breath, sweating, faintness, or nausea.
These can be symptoms of a heart attack, especially when the discomfort is new or unexplained.
Emergency care is also appropriate after a major injury if the shoulder looks out of place, the arm is cold or pale, or you cannot feel or move it normally.
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 if:
The shoulder is hot, red, or swollen and you have a fever
Severe pain started suddenly or followed an injury
You cannot lift the arm after an injury
New weakness, numbness, or persistent tingling develops
Swelling or bruising is increasing quickly
Arrange care sooner if you have had recent shoulder surgery or have a condition or treatment that reduces your ability to fight infection.
And for anyone, someone who:
has abdominal pain that is severe, constant, or getting worse
3
Does any of this apply?
Book an appointment
Book a routine appointment if pain is not starting to improve after about two weeks, keeps returning, disturbs sleep, or makes work and daily activities difficult.
Every sign above is quoted from the sofidex article on Shoulder pain. If you are not sure, err upward — it is always reasonable to be checked.