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 breast or upper chest discomfort comes with chest pressure, severe shortness of breath, fainting, confusion, or heavy sweating.
These symptoms may come from the heart or lungs rather than the breast.
Rapid deterioration with a serious infection also needs emergency help.
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 for a breast that becomes red, hot, swollen, and painful, especially if you have a fever or feel unwell.
Also seek prompt care for a tender swelling that may contain pus, or symptoms that worsen despite treatment for mastitis.
3
Does any of this apply?
Book an appointment
Arrange a routine appointment if you notice:
A new breast or armpit lump
Pain that persists, worsens, or keeps returning in one place
Unexplained nipple discharge, especially from one breast
A nipple newly turning inward
Dimpling, puckering, persistent redness, or a scaly nipple rash
A change in breast size or shape that is new for you
Every sign above is quoted from the sofidex article on Breast problems. If you are not sure, err upward — it is always reasonable to be checked.