Culprit No. 5: The wrong bra
Large-breasted women obviously carry significantly more weight in front than those who have smaller breasts. This can lead to hunching and sore neck and back muscles, Sinett says. A bra that offers proper support can actually minimize that forward hunch and relieve pain, while one that doesn’t may exacerbate the problem, as you hunch or strain even more to compensate for uncomfortable straps or a band that rides up.
Research shows that many women wear the wrong size bra, but the right fit can mean the difference between sagging and supported; get fitted by a bra professional. Prather says you may want to try a T-back (a.k.a. racer-back) style. "It gives the body a cue to pull the shoulders back," she says.