Some women push-up bras can actually cause discomfort and even pain depending on the materials, size, and fitting. Many times women do not find the appropriate fitting or size and style to their bras, and this can cause breathing difficulties at times and side effects if the bra is too tight. Because a push-up bra style main function is to elevate and encourage cleavage, it is normally tighter than the average bra, and bad fitting and sizing can cause more problems than if it was just a normal bra style.
If women are not comfortable in wearing a push-up bra, you should not put up with any discomfort just for the cleavage. Either that, or have a professional size you, and fit you for a suitable push-up bra that is comfortable.