We know that behind the sternum of a normal person are the heart and lungs. Pectus excavatum is a deformity where this part of the sternum is pressed inward towards the spine. Such inward compression, as it occurs right against the bony spine, will directly squeeze the heart and in severe cases, can lead to insufficiency in the heart valve closure. Therefore, the most critical issue with pectus excavatum is the compression of the heart, which also compresses the lungs. Thus, 80% of children with pectus excavatum have lower exercise capacity compared to normal children, 60% may experience chest pain, and 40% have a significantly higher respiratory rate than normal children. Therefore, for patients with pectus excavatum, it is crucial to be cautious about common colds, as their respiratory and cardiac functions can be greatly affected if they catch a cold.