When the band (the number) of your bra is not giving you adequate support, the shoulder straps are forced into providing additional support. The most common reason for digging shoulder straps is the band size being too large. Full-figured women know the bra sizing game all too well. For example, if she is a 38E and the bra she wants only goes as high as a “D” cup, she will go up a band size and down a cup size and think it fits (40D). However, she has done a disservice to herself because going up a band size means her straps are going to have to make up for the support lost in the increased band size. To relieve shoulder strap pain, Do not go up the band size.