Breast Pain

Shanya

So on Sunday I woke up an my left breast was killing me (I'm currently bf an my lo is barley 4 months). Well it felt a little swollen so I did warm compressions before feed and after then pump, my whole day. The next day the swelling was gone, but it's now Thursday and it still hurts really bad when he latches on and I get weird aches in my breast threw out the day. Anyone have any ideas what could be going on?