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
Get urgent or emergency help for:
Chest pain, fainting, confusion, or severe weakness
Severe breathing difficulty or breathlessness at rest
Vomiting blood or passing black, tar-like stools
Heavy, uncontrolled bleeding
A rapid decline in symptoms, especially with heart or lung disease
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 prompt medical advice if you have worsening tiredness, shortness of breath with ordinary activity, frequent dizziness, a racing heartbeat, heavy periods, unexplained weight loss, persistent abdominal symptoms, or visible blood in your stool.
3
Does any of this apply?
Book an appointment
Arrange a routine medical appointment if a blood test reports hypochromia, low MCH, low MCHC, microcytosis, or anaemia.
This is especially important if the finding is new, unexplained, or persistent.
A mildly abnormal result without severe symptoms is not usually an emergency, but it still deserves routine follow-up to identify the cause.
Every sign above is quoted from the sofidex article on Hypochromia. If you are not sure, err upward — it is always reasonable to be checked.