Kyphosis is a deformity of the spinal column in the sagittal (lateral) plane.

It is an excessive curve of the spine (convexity in the chest towards the back) that exceeds the limit of 40 degrees according to Cobb's angle.

Kyphosis can be functional and structural.

Functional kyphosis or kyphotic bad posture represents muscle weakness that can be corrected by voluntary contraction and corrective exercises.

Structural kyphosis happens that one part of the spinal column becomes fixed and this happens after puberty and the completion of growth and development.

The clinical picture of people with kyphosis can be recognized by the pronounced convexity in the chest area towards the back, bent shoulders, head protrusion and pronounced lumbar lordosis.