The word "kyphosis" describes a type of curve in the spine. A kyphotic curve is normally present in the thoracic spine (the part of the spine in the chest area). Though the thoracic spine is supposed to be curved, if the curve in a person's thoracic spine is more than 40 to 45 degrees, it is considered abnormal - or kyphotic.
Adult kyphosis can have varying degrees of severity, from minor changes in teh shape of your back, to severe deformity, nerve problems, and chronic pain.
For more information on the causes of kyphosis in adults, click here.