Why are my breasts no longer sore?

Probably hormones: It depends on why they were sore in the first place. If they were sore or tender before or at the start of your period this is a response to the hormones in your body at that time. These cycle throughout the month, making your breasts tender or sore at some times but not others.

I do not know: Until one knows why they were sore in the first place, we may never know why they are mo longer sore. But I am glad they are not sore anymore. Best wishes.