Hi,
A friend I know had the same problem a few years ago and the physician who checked her blamed the bra too.
You may have been using the same size for years but a slight change in the model or size - or as suggested before, not wearing one - might help.
Now I need help/advise on a new issue...
Do you have any lumps or a hard surface like thing around the place of pain?
Cos my friend does now...she tried changing her bra, but has not helped so far. In fact the pain spread to her lungs too, so was advised to go on some pain killers.
Had a mammogram (breast X-ray) done, and no anomalies detected.
No cysts/lumps as per the ultrasound (the screening is done after the mammogram compulsorily in my home country).
But the pain persists and there's a feeling of fullness and a bit of tenderness too. No discharge though.
Any got any idea what it might be? Cos the doctors have asked her to go on the pain killers and see what happens.