Having very big breasts can place excess weight on the chest and without adequate support from the surrounding muscles and the rest of the body, the weight of the breasts can cause severe pain.
It's often hard to maintain good posture, and even lead to chronic back problems.
The upper part of the spine is built to withstand a significant amount of weight and it acts as an anchor to the rib cage and supports the upper body. However, like with lower back pain, upper back pain is most often caused by strain on the muscles and ligaments from poor posture and repetitive motions.
For women with very large breasts, it doesn't take hours spent hunched over a computer or a vigorous gym session to cause upper back pain. The sheer 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.
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