Not if always there
Pectus excavatum is the most common congenital deformity of the anterior chest wall, in which several ribs and the sternum grow abnormally.
It produces a caved-in or sunken appearance of the chest and can either be present at birth or not develop until puberty
. The defect is usually cosmetic, but may cause cardiac or respiratory impairment if severe enough.
Answer assisted by Brian Fishman, Medical Student