Pigeon chest is a common thoracic deformity characterized by a protruding sternum, generally believed to be related to genetics, and most consider it caused by excessive growth of the ribs and costal cartilage. The deformity of the sternum is secondary to the deformity of the ribs. Funnel chest, on the other hand, refers to the inward concavity of the lower part of the sternum, along with the neighboring ribs and costal cartilages, forming a funnel-like appearance, a type of congenital thoracic deformity more common in males than females. The etiology of funnel chest is relatively complex; it might involve the gradual worsening of the sternum being pulled at various levels during growth and development. It could also be due to excessive growth of the ribs on both sides, pressing the sternum backward, leading to the formation of funnel chest. Some also consider it a sex-linked dominant hereditary disease. The thoracic deformity in pigeon chest primarily protrudes outward, whereas in funnel chest, it concaves inward, and the causes are also different.