It could be fit, I suppose. If bloodflow is affected or if things move around more than the bra designer intended, I could certainly see how that might cause discomfort over time. Maybe a typical bra doesn't position well on your individual body. Maybe a different style of bra, like a longline or something might be more comfortable? Or perhaps there are other alternatives. I'm no expert. I do know that if I wear one that isn't a comfortable fit for band, side support, front gap, strap position, etc. then yes it gets quite uncomfortable after a while. The old saying, "Be careful what you wish for" comes to mind quite readily about now.
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