Opisthotonos is the term that describes an abnormal posture that happens when the muscles in your neck, back, and legs spasm and contract. These contractions cause your body to bend backward into a ...

Kyphosis is an abnormal rounding of the upper back. It is a relatively common condition that often develops in adolescence or young adulthood. Having a small curve in the upper back is normal.

No spine is perfectly straight, but people with scoliosis have more significant curvature than people without scoliosis, often more than 10 degrees out of alignment. These curves are called S-curves ...