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 apparent breast pain comes with chest pressure, severe breathlessness, faintness, sweating, or pain spreading to your arm, back, neck, or jaw.
These symptoms may be coming from the heart or lungs rather than the breast.
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 care if part of your breast becomes red, hot, rapidly more swollen, or very painful, especially if you have a fever or feel unwell.
These symptoms may indicate an infection or a collection of pus called an abscess.
3
Does any of this apply?
Book an appointment
Book a routine appointment if:
A new lump remains after your next period
Pain is focused in one spot or keeps worsening
Symptoms no longer follow your usual menstrual pattern
You have bloody or clear nipple discharge
A nipple becomes newly pulled inward
Breast skin becomes puckered, thickened, or persistently red
Symptoms interfere with sleep or everyday activities
Arrange an appointment if you are worried, even if your change is not listed here.
Every sign above is quoted from the sofidex article on Premenstrual breast changes. If you are not sure, err upward — it is always reasonable to be checked.