I didnt have strapping on because I had overs, but the macom bra was like torture for me, way to tight. I went and got a few M&S ones in different sizes and instantly it made a big difference. Stacey is right maybe double check with the nurse, could be different after unders. But I also think if its soooo tight it could cause problems to, maybe the strapping by its self is supportive enough. Good luck