I used to get painful breasts at the start of my period and the doctor said it was non-malignant mastitis. I tolerated it.
I've noticed now that its gone . BUT i now get a sore bit all the time on my left breast. There is no lump, but its been nagging away at me for some months. I particularly notice it when picking up my kids or holding something against it.
I have no desire at all to go to the doctor. I am sure he/she will say what they always say about anything that isn't a leg hanging off - "keep an eye on it and come back if it changes".
I'd like loads of you to say you get exactly the same and its not worth bothering about .