If you look at yourself in the mirror, you will notice that the spine is not a straight line when viewed from the side. It has a natural S-shaped curvature that gives it flexibility and support. The curved parts of the spine also allow it to act as a spring that absorbs shock.
The outward curve in the thoracic spine (where the ribs are attached) is called kyphosis, and it normally ranges from 20-45 degrees.
In essence, kyphosis is normal. The exaggerated outward curvature is medically known as hyperkyphosis, and it measures more than 50 degrees. However, since kyphosis is the term commonly used to refer to hyperkyphosis, we will be using this term in this article.
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