It depends on what kind of underwear you are wearing? Is it a regular bra or a sports bra? The size of the wearer is also one of the factors. For example, some women are dissatisfied with the shape of their breasts, arch their shoulders or push their chests too high, and in fact these positions have a big impact on the back muscles.
The main function of the bra is to support the weight and structure of the breast, which is subject to a lot of pressure and stiffness. A tight bust can affect the chest cavity and cause back and neck pain. It is worth noting that if you realize that the bust you are wearing is too loose, it is not enough to tighten the straps, which may cause pain due to incorrect force balance.
