Kyphosis is an abnormal curvature of the spine that causes a rounded back. There are three main types - postural, Scheuermann's, and congenital. Postural kyphosis is most common and caused by poor posture, while Scheuermann's has unknown causes and congenital kyphosis occurs during fetal development. Symptoms include back pain, breathing difficulties, and fatigue. Treatment involves braces, exercises, medications, and sometimes surgery to correct severe or progressive cases. Maintaining a healthy diet can also help recovery.