What condition is described as having a hump or protrusion on the back?

The condition characterized by a hump or protrusion on the back is known as "Hump Back." This condition, medically referred to as kyphosis, occurs when the spine exhibits an excessive outward curvature, leading to a visible hump on the upper back. It can be caused by various factors, including poor posture, degenerative diseases, or as a result of certain disorders. This designation is specifically associated with the abnormal curvature that results in the distinctive hump appearance. Understanding this condition is important for recognizing posture-related issues and potentially addressing them through medical or therapeutic interventions.

Other options describe different back shapes or conditions, but only "Hump Back" directly refers to the specific protrusion on the back, making it the correct answer.