I have had a continuing problem with one breast. It is the one that I had mastitis on years ago and blocked ducts - there is a duct behind against the chest wall that is a particular problem.
It all started up again after my first mammo where I was over-crushed (it was painful and felt bruised for a couple of days after on both sides) and came back each month after for about 9 months. I looked up breast conditions and there are things where the ducts get drier and a bit bunged up that can lead to mastitis (ecstasia) which it did feel similar to, so I took ibuprofen and wore my favourite breast shaped bra and it went.
However, it did come back with hrt and I was recalled to the breast clinic after the second mammogram. I had loads of mammos and ultrasound and they could find nothing wrong. The doctor there showed great suprise that I still had cycles at 51
so I was not very encouraged by him. But at least it was not something to worry about.
As time went on, and also clear mammograms which seem to be the only answer for doctors, it got more annoying and I was getting itchy problems so I tried canesten, which has helped, massage, which helped a bit too, have bought several expensive bras to replace my old favourite which fell apart (I cannot wear balconette styles or the soft cup ones which crush me into a monoboob or lacy ones).
I changed from sequential femoston 2/10 to continuous femoston conti 1/5 which is only 1 mg of estrogen. It has made it harder to control my bladder and vaginal symptoms as I find vagifem (and the substitute they give me now) is not so good and I need to remember to use extra. The breast symptoms have gone completely though. It always seems to be a case of balancing good effects against bad effects - nothing is perfect.