Breast Pain w/14m Nursling

Kr

I’ve been breastfeeding my son for the last 14 months. It’s been a unicorn experience- no issues or anything, life is easy, etc.

The last few days my breasts have been quite tender and breastfeeding is even painful. I don’t know what could be causing this. I am uncomfortable at best, in pain far too often.

Any ideas what could be up?