Funnel chest is a condition where the breastbone or sternum appears sunken inwards, causing the chest to take on a concave or funnel-like shape. Synonyms for funnel chest include pectus excavatum, concave chest, sunken chest, and cobbler's breast. This rare condition affects about 1 in 1,000 people and can be present at birth or develop during adolescence. While generally not a harmful condition, it can cause issues with self-esteem and body image for individuals affected. Treatment options vary from observation to corrective surgery, depending on the degree of severity and any accompanying symptoms.