According to Every Day Health:
The upper part of the spine is very strong, acting as an anchor to the rib cage and supporting the upper body, but it can also be prone to upper back pain. As with lower back pain, upper back pain is most often caused by strain on the muscles and ligaments from poor posture and repetitive motions.
But for women with very large breasts, it doesn’t take hours spent slouched in front of a computer or a vigorous game of tennis to cause upper back pain. Simply the weight of their breasts alone can be enough to cause back pain, sometimes even leading to long-term chronic pain that lasts for months or years.
The Link Between Large Breasts and Back Pain
Having very large breasts can place excess weight on the chest. Without enough support from the surrounding muscles and the rest of the body, the weight of the breasts can cause severe pain, make it difficult to maintain good posture, and even lead to spinal deformity. And being self-conscious about large breasts also makes some women hunch forward in an attempt to hide their chest, which can worsen existing back pain.
Very large-breasted women sometimes have to grapple not only with chronic pain in their backs and necks, but also with bra straps that dig into their skin and limitations on the activities that they can comfortably engage in.
Back Pain and Breast Size: Research Findings
Studies have shown that there can be a chain reaction of painful symptoms resulting from large breasts, as the body compensates for an abnormal position in one part of the back by shifting the position of another. Breast cups size D and above can cause upper back pain by altering the curvature of the spine, according to research, and can have an important impact on posture.
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