Since pectus excavatum is an inward and backward depression, such a depression may gradually become apparent even from a young age, especially worsening during adolescence. Therefore, children or patients with this condition should be aware of any significant lack of calcium or vitamin D. Of course, since pectus excavatum may also be somewhat related to familial genetic factors, it is important to check whether the child has any congenital heart diseases, Noonan syndrome, or connective tissue disorders. Since pectus excavatum causes an inward and backward indentation that compresses the heart and lungs, children with this condition may not be able to fully expand their lungs or completely relax their hearts. Consequently, these children tend to have a weaker constitution and may catch colds easily. Therefore, children with pectus excavatum should avoid crowded places, as their weaker constitution makes them more susceptible to colds, which can exacerbate their developmental issues, thus creating a vicious cycle.