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 for:
Chest pain, pressure, or tightness that is severe, persistent, or new
Severe difficulty breathing
Fainting or sudden collapse
Sudden facial drooping, arm weakness, or trouble speaking
A blood pressure above 180/120 mmHg with chest pain, breathlessness, confusion, weakness, vision change, or another new neurological symptom
These symptoms can indicate a heart attack, stroke, or hypertensive emergency.
Do not drive yourself if you feel severely unwell.
And for anyone, someone who:
has chest pain, tightness or pressure lasting more than a few minutes
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
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 prompt medical advice if your blood pressure is above 180/120 mmHg after repeating the measurement correctly, even without symptoms.
A healthcare service can advise how quickly you need assessment.
Do not take extra medicine unless this is part of a plan already given to you.
And for anyone, someone who:
is getting rapidly more short of breath, or has gained several pounds in a few days with swelling
3
Does any of this apply?
Book an appointment
Arrange a routine appointment if your blood pressure readings are repeatedly above the target set for you, even if you feel well.
You should also arrange review for gradually increasing breathlessness, ankle swelling, fatigue, palpitations, or reduced exercise ability.
Every sign above is quoted from the sofidex article on Hypertensive heart disease. If you are not sure, err upward — it is always reasonable to be checked.