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 or go to an emergency department if neck pain follows a major collision, fall, diving accident, or other forceful injury.
Keep your neck as still as practical while waiting for help.
Emergency care is also appropriate for neck pain with:
New weakness or loss of movement in an arm or leg
New trouble walking, poor balance, or loss of coordination
Loss of bladder or bowel control
Fainting, confusion, difficulty speaking, facial drooping, or sudden vision changes
A sudden, severe, unfamiliar headache or neck pain
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 you have neck stiffness with fever, severe headache, a rash that does not fade when pressed, marked drowsiness, or sensitivity to light.
These can occur with meningitis, an infection of the tissues surrounding the brain and spinal cord.
You should also seek prompt advice if the pain started after a less severe injury and is worsening, or if you have cancer, a weakened immune system, or signs of infection such as fever and feeling very unwell.
Arrange an assessment sooner if tingling, numbness, or weakness is persistent or worsening.
And for anyone, someone who:
has a fever with a stiff neck, a rash that does not fade under pressure, or severe headache
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 improving, keeps returning, disrupts sleep, or limits normal activities.
Every sign above is quoted from the sofidex article on Neck pain. If you are not sure, err upward — it is always reasonable to be checked.